The remote Oracle Linux 6 / 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2019-4837 advisory.

    - x86/tsx: Add config options to set tsx=on|off|auto (Michal Hocko)  [Orabug: 30419233]  {CVE-2019-11135}
    - x86/speculation/taa: Add documentation for TSX Async Abort (Pawan Gupta)  [Orabug: 30419233]     {CVE-2019-11135}
    - x86/tsx: Add 'auto' option to the tsx= cmdline parameter (Pawan Gupta)  [Orabug: 30419233]     {CVE-2019-11135}
    - kvm/x86: Export MDS_NO=0 to guests when TSX is enabled (Pawan Gupta)  [Orabug: 30419233]     {CVE-2019-11135}
    - x86/speculation/taa: Add sysfs reporting for TSX Async Abort (Pawan Gupta)  [Orabug: 30419233]     {CVE-2019-11135}
    - x86/speculation/taa: Add mitigation for TSX Async Abort (Kanth Ghatraju)  [Orabug: 30419233]     {CVE-2019-11135}
    - x86/cpu: Add a 'tsx=' cmdline option with TSX disabled by default (Pawan Gupta)  [Orabug: 30419233]     {CVE-2019-11135}
    - x86/cpu: Add a helper function x86_read_arch_cap_msr() (Pawan Gupta)  [Orabug: 30419233]     {CVE-2019-11135}
    - x86/msr: Add the IA32_TSX_CTRL MSR (Pawan Gupta)  [Orabug: 30419233]  {CVE-2019-11135}
    - kvm: x86: mmu: Recovery of shattered NX large pages (Junaid Shahid)  [Orabug: 29967631]     {CVE-2018-12207}
    - kvm: Add helper function for creating VM worker threads (Junaid Shahid)  [Orabug: 29967631]     {CVE-2018-12207}
    - kvm: mmu: ITLB_MULTIHIT mitigation (Paolo Bonzini)  [Orabug: 29967631]  {CVE-2018-12207}
    - KVM: x86: remove now unneeded hugepage gfn adjustment (Paolo Bonzini)  [Orabug: 29967631]     {CVE-2018-12207}
    - KVM: x86: make FNAME(fetch) and __direct_map more similar (Paolo Bonzini)  [Orabug: 29967631]     {CVE-2018-12207}
    - kvm: x86: Do not release the page inside mmu_set_spte() (Junaid Shahid)  [Orabug: 29967631]     {CVE-2018-12207}
    - x86/cpu: Add Tremont to the cpu vulnerability whitelist (Pawan Gupta)  [Orabug: 29967631]     {CVE-2018-12207}
    - x86: Add ITLB_MULTIHIT bug infrastructure (Pawan Gupta)  [Orabug: 29967631]  {CVE-2018-12207}
    - KVM: x86: MMU: Move mapping_level_dirty_bitmap() call in mapping_level() (Takuya Yoshikawa)  [Orabug:
    29967631]  {CVE-2018-12207}
    - Revert 'KVM: x86: use the fast way to invalidate all pages' (Sean Christopherson)  [Orabug: 29967631]     {CVE-2018-12207}
    - kvm: Convert kvm_lock to a mutex (Junaid Shahid)  [Orabug: 29967631]  {CVE-2018-12207}
    - KVM: x86: MMU: Simplify force_pt_level calculation code in FNAME(page_fault)() (Takuya Yoshikawa)     [Orabug: 29967631]  {CVE-2018-12207}
    - KVM: x86: MMU: Make force_pt_level bool (Takuya Yoshikawa)  [Orabug: 29967631]  {CVE-2018-12207}
    - KVM: x86: MMU: Remove unused parameter parent_pte from kvm_mmu_get_page() (Takuya Yoshikawa)  [Orabug:
    29967631]  {CVE-2018-12207}
    - KVM: x86: extend usage of RET_MMIO_PF_* constants (Paolo Bonzini)  [Orabug: 29967631]  {CVE-2018-12207}
    - KVM: x86: MMU: Make mmu_set_spte() return emulate value (Takuya Yoshikawa)  [Orabug: 29967631]     {CVE-2018-12207}
    - KVM: x86: MMU: Move parent_pte handling from kvm_mmu_get_page() to link_shadow_page() (Takuya Yoshikawa)     [Orabug: 29967631]  {CVE-2018-12207}

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Security Fix(es) :

  - hw: Machine Check Error on Page Size Change (IFU)     (CVE-2018-12207)

  - hw: TSX Transaction Asynchronous Abort (TAA)     (CVE-2019-11135)

  - hw: Intel GPU Denial Of Service while accessing MMIO in     lower power state (CVE-2019-0154)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

USN-4183-1 fixed vulnerabilities in the Linux kernel. It was discovered that the kernel fix for CVE-2019-0155 (i915 missing Blitter Command Streamer check) was incomplete on 64-bit Intel x86 systems.
This update addresses the issue.

We apologize for the inconvenience.

Stephan van Schaik, Alyssa Milburn, Sebastian Osterlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, Cristiano Giuffrida, Giorgi Maisuradze, Moritz Lipp, Michael Schwarz, Daniel Gruss, and Jo Van Bulck discovered that Intel processors using Transactional Synchronization Extensions (TSX) could expose memory contents previously stored in microarchitectural buffers to a malicious process that is executing on the same CPU core. A local attacker could use this to expose sensitive information. (CVE-2019-11135)

It was discovered that the Intel i915 graphics chipsets allowed userspace to modify page table entries via writes to MMIO from the Blitter Command Streamer and expose kernel memory information. A local attacker could use this to expose sensitive information or possibly elevate privileges. (CVE-2019-0155)

Deepak Gupta discovered that on certain Intel processors, the Linux kernel did not properly perform invalidation on page table updates by virtual guest operating systems. A local attacker in a guest VM could use this to cause a denial of service (host system crash).
(CVE-2018-12207)

It was discovered that the Intel i915 graphics chipsets could cause a system hang when userspace performed a read from GT memory mapped input output (MMIO) when the product is in certain low power states. A local attacker could use this to cause a denial of service.
(CVE-2019-0154)

Jann Horn discovered a reference count underflow in the shiftfs implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-15791)

Jann Horn discovered a type confusion vulnerability in the shiftfs implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-15792)

Jann Horn discovered that the shiftfs implementation in the Linux kernel did not use the correct file system uid/gid when the user namespace of a lower file system is not in the init user namespace. A local attacker could use this to possibly bypass DAC permissions or have some other unspecified impact. (CVE-2019-15793)

It was discovered that a buffer overflow existed in the 802.11 Wi-Fi configuration interface for the Linux kernel when handling beacon settings. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-16746)

Nico Waisman discovered that a buffer overflow existed in the Realtek Wi-Fi driver for the Linux kernel when handling Notice of Absence frames. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
(CVE-2019-17666).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for qemu fixes the following issues :

  - Patch queue updated from     https://gitlab.suse.de/virtualization/qemu.git SLE15

  - Fix use-after-free in slirp (CVE-2018-20126 bsc#1119991)

  - Fix potential DOS in lsi scsi controller emulation     (CVE-2019-12068 bsc#1146873)

  - Expose taa-no 'feature', indicating CPU does not have     the TSX Async Abort vulnerability. (CVE-2019-11135     bsc#1152506)

  - Expose pschange-mc-no 'feature', indicating CPU does not     have the page size change machine check vulnerability     (CVE-2018-12207 bsc#1155812)

This update was imported from the SUSE:SLE-15:Update update project.

add missing XSA-299 patches

----

x86: Machine Check Error on Page Size Change DoS [XSA-304, CVE-2018-12207] TSX Asynchronous Abort speculative side channel [XSA-305, CVE-2019-11135]

----

VCPUOP_initialise DoS [XSA-296, CVE-2019-18420] missing descriptor table limit checking in x86 PV emulation [XSA-298, CVE-2019-18425] Issues with restartable PV type change operations [XSA-299, CVE-2019-18421] add-to-physmap can be abused to DoS Arm hosts [XSA-301, CVE-2019-18423] passed through PCI devices may corrupt host memory after deassignment [XSA-302, CVE-2019-18424] ARM: Interrupts are unconditionally unmasked in exception handlers [XSA-303, CVE-2019-18422]

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2019:3936 advisory.

    This is a kernel live patch module which is automatically loaded by the RPM post-install script to modify     the code of a running kernel.

    Security Fix(es):

    * hw: Machine Check Error on Page Size Change (IFU) (CVE-2018-12207)

    * hw: TSX Transaction Asynchronous Abort (TAA) (CVE-2019-11135)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2019-3832 advisory.

    - [drm] drm/i915: Lower RM timeout to avoid DSI hard hangs (Dave Airlie) [1766056 1756805] {CVE-2019-0154}
    - [drm] drm/i915/gen8+: Add RC6 CTX corruption WA (Dave Airlie) [1766056 1756805] {CVE-2019-0154}
    - [drm] drm/i915/cmdparser: Ignore Length operands during command matching (Dave Airlie) [1756871 1756873]     {CVE-2019-0155}
    - [drm] drm/i915/cmdparser: Add support for backward jumps (Dave Airlie) [1756871 1756873] {CVE-2019-0155}
    - [drm] drm/i915/cmdparser: Use explicit goto for error paths (Dave Airlie) [1756871 1756873]     {CVE-2019-0155}
    - [drm] drm/i915: Add gen9 BCS cmdparsing (Dave Airlie) [1756871 1756873] {CVE-2019-0155}
    - [drm] drm/i915: Allow parsing of unsized batches (Dave Airlie) [1756871 1756873] {CVE-2019-0155}
    - [drm] drm/i915: Support ro ppgtt mapped cmdparser shadow buffers (Dave Airlie) [1756871 1756873]     {CVE-2019-0155}
    - [drm] drm/i915: Add support for mandatory cmdparsing (Dave Airlie) [1756871 1756873] {CVE-2019-0155}
    - [drm] drm/i915: Remove Master tables from cmdparser (Dave Airlie) [1756871 1756873] {CVE-2019-0155}
    - [drm] drm/i915: Disable Secure Batches for gen6+ (Dave Airlie) [1756871 1756873] {CVE-2019-0155}
    - [drm] drm/i915: Rename gen7 cmdparser tables (Dave Airlie) [1756871 1756873] {CVE-2019-0155}
    - [x86] x86/tsx: Add config options to set tsx=on|off|auto (Josh Poimboeuf) [1766550 1766551]     {CVE-2019-11135}
    - [documentation] x86/speculation/taa: Add documentation for TSX Async Abort (Josh Poimboeuf) [1766550     1766551] {CVE-2019-11135}
    - [x86] x86/tsx: Add 'auto' option to the tsx= cmdline parameter (Josh Poimboeuf) [1766550 1766551]     {CVE-2019-11135}
    - [base] x86/speculation/taa: Add sysfs reporting for TSX Async Abort (Josh Poimboeuf) [1766550 1766551]     {CVE-2019-11135}
    - [x86] x86/speculation/taa: Add mitigation for TSX Async Abort (Josh Poimboeuf) [1766550 1766551]     {CVE-2019-11135}
    - [x86] x86/cpu: Add a 'tsx=' cmdline option with TSX disabled by default (Josh Poimboeuf) [1766550     1766551] {CVE-2019-11135}
    - [x86] x86/cpu: Add a helper function x86_read_arch_cap_msr() (Josh Poimboeuf) [1766550 1766551]     {CVE-2019-11135}
    - [x86] x86/msr: Add the IA32_TSX_CTRL MSR (Josh Poimboeuf) [1766550 1766551] {CVE-2019-11135}
    - [documentation] Documentation: Add ITLB_MULTIHIT documentation (Paolo Bonzini) [1698416 1690344]     {CVE-2018-12207}
    - [kvm] kvm: x86: mmu: Recovery of shattered NX large pages (Paolo Bonzini) [1698416 1690344]     {CVE-2018-12207}
    - [virt] kvm: Add helper function for creating VM worker threads (Paolo Bonzini) [1698416 1690344]     {CVE-2018-12207}
    - [kvm] kvm: mmu: ITLB_MULTIHIT mitigation (Paolo Bonzini) [1698416 1690344] {CVE-2018-12207}
    - [kernel] cpu/speculation: Uninline and export CPU mitigations helpers (Paolo Bonzini) [1698416 1690344]     {CVE-2018-12207}
    - [x86] x86/cpu: Add Tremont to the cpu vulnerability whitelist (Paolo Bonzini) [1698416 1690344]     {CVE-2018-12207}
    - [x86] x86: Add ITLB_MULTIHIT bug infrastructure (Paolo Bonzini) [1698416 1690344] {CVE-2018-12207}
    - [kvm] KVM: vmx, svm: always run with EFER.NXE=1 when shadow paging is active (Paolo Bonzini) [1698416     1690344] {CVE-2018-12207}
    - [kvm] KVM: x86: add tracepoints around __direct_map and FNAME(fetch) (Paolo Bonzini) [1698416 1690344]     {CVE-2018-12207}
    - [kvm] KVM: x86: change kvm_mmu_page_get_gfn BUG_ON to WARN_ON (Paolo Bonzini) [1698416 1690344]     {CVE-2018-12207}
    - [kvm] KVM: x86: remove now unneeded hugepage gfn adjustment (Paolo Bonzini) [1698416 1690344]     {CVE-2018-12207}
    - [kvm] KVM: x86: make FNAME(fetch) and __direct_map more similar (Paolo Bonzini) [1698416 1690344]     {CVE-2018-12207}
    - [kvm] kvm: mmu: Do not release the page inside mmu_set_spte() (Paolo Bonzini) [1698416 1690344]     {CVE-2018-12207}
    - [kvm] kvm: Convert kvm_lock to a mutex (Paolo Bonzini) [1698416 1690344] {CVE-2018-12207}
    - [kvm] KVM: x86/mmu: Reintroduce fast invalidate/zap for flushing memslot (Paolo Bonzini) [1698416     1690344] {CVE-2018-12207}
    - [kvm] Revert 'KVM: x86/mmu: Zap only the relevant pages when removing a memslot' (Paolo Bonzini)     [1698416 1690344] {CVE-2018-12207}
    - [kvm] kvm: x86, powerpc: do not allow clearing largepages debugfs entry (Paolo Bonzini) [1698416     1690344] {CVE-2018-12207}

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the ELSA-2019-4867 advisory.

    [2:2.1-53.3.0.4]
    - set early_microcode='no' in virtualized guests to avoid early load bugs [Orabug: 30618736]

    [2:2.1-53.3.0.1]
    - do not late load prior to 3.10.0
    - ensure late loading fixes are present on 4.1.12-* and 4.14.35-*
    - enable early loading on 06-4f-01
    - update 06-55-04 to 0x2000065
    - update 06-55-07 to 0x500002c

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

An update of the linux package has been released.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:0204 advisory.

    The kernel packages contain the Linux kernel, the core of any Linux operating system.

    Security Fix(es):

    * hw: Machine Check Error on Page Size Change (IFU) (CVE-2018-12207)

    * hw: TSX Transaction Asynchronous Abort (TAA) (CVE-2019-11135)

    * kernel: nfs: use-after-free in svc_process_common() (CVE-2018-16884)

    * hw: Intel GPU blitter manipulation can allow for arbitrary kernel memory write (CVE-2019-0155)

    * Kernel: vhost_net: infinite loop while receiving packets leads to DoS (CVE-2019-3900)

    * Kernel: page cache side channel attacks (CVE-2019-5489)

    * hardware: bluetooth: BR/EDR encryption key negotiation attacks (KNOB) (CVE-2019-9506)

    * kernel: Heap overflow in mwifiex_uap_parse_tail_ies function in     drivers/net/wireless/marvell/mwifiex/ie.c (CVE-2019-10126)

    * kernel: heap overflow in mwifiex_update_vs_ie() function of Marvell WiFi driver (CVE-2019-14816)

    * Kernel: KVM: OOB memory access via mmio ring buffer (CVE-2019-14821)

    * kernel: heap overflow in marvell/mwifiex/tdls.c (CVE-2019-14901)

    * hw: Intel GPU Denial Of Service while accessing MMIO in lower power state (CVE-2019-0154)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    Bug Fix(es):

    * Backport TCP follow-up for small buffers (BZ#1739184)

    * TCP performance regression after CVE-2019-11478 bug fix (BZ#1743170)

    * RHEL8.0 - bnx2x link down, caused by transmit timeouts during load test (Marvell/Cavium/QLogic) (L3:)     (BZ#1743548)

    * block: blk-mq improvement (BZ#1780567)

    * RHEL8.0 - Regression to RHEL7.6 by changing force_latency found during RHEL8.0 validation for SAP HANA     on POWER (BZ#1781111)

    * blk-mq: overwirte performance drops on real MQ device (BZ#1782183)

    * RHEL8: creating vport takes lot of memory i.e 2GB per vport which leads to drain out system memory     quickly. (BZ#1782705)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of AOS installed on the remote host is prior to 5.11.3. It is, therefore, affected by multiple vulnerabilities as referenced in the NXSA-AOS-5.11.3 advisory.

  - A heap overflow flaw was found in the Linux kernel, all versions 3.x.x and 4.x.x before 4.18.0, in Marvell     WiFi chip driver. The vulnerability allows a remote attacker to cause a system crash, resulting in a     denial of service, or execute arbitrary code. The highest threat with this vulnerability is with the     availability of the system. If code execution occurs, the code will run with the permissions of root. This     will affect both confidentiality and integrity of files on the system. (CVE-2019-14901)

  - OpenSLP as used in ESXi and the Horizon DaaS appliances has a heap overwrite issue. VMware has evaluated     the severity of this issue to be in the Critical severity range with a maximum CVSSv3 base score of 9.8.
    (CVE-2019-5544)

  - In Sudo before 1.8.28, an attacker with access to a Runas ALL sudoer account can bypass certain policy     blacklists and session PAM modules, and can cause incorrect logging, by invoking sudo with a crafted user     ID. For example, this allows bypass of !root configuration, and USER= logging, for a sudo -u     \#$((0xffffffff)) command. (CVE-2019-14287)

  - Empty or malformed p256-ECDH public keys may trigger a segmentation fault due values being improperly     sanitized before being copied into memory and used. This vulnerability affects Firefox ESR < 60.8, Firefox     < 68, and Thunderbird < 60.8. (CVE-2019-11729)

  - When encrypting with a block cipher, if a call to NSC_EncryptUpdate was made with data smaller than the     block size, a small out of bounds write could occur. This could have caused heap corruption and a     potentially exploitable crash. This vulnerability affects Thunderbird < 68.3, Firefox ESR < 68.3, and     Firefox < 71. (CVE-2019-11745)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES11 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2020:14444-1 advisory.

  - Improper invalidation for page table updates by a virtual guest operating system for multiple Intel(R)     Processors may allow an authenticated user to potentially enable denial of service of the host system via     local access. (CVE-2018-12207)

  - TSX Asynchronous Abort condition on some CPUs utilizing speculative execution may allow an authenticated     user to potentially enable information disclosure via a side channel with local access. (CVE-2019-11135)

  - An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service     via a VCPUOP_initialise hypercall. hypercall_create_continuation() is a variadic function which uses a     printf-like format string to interpret its parameters. Error handling for a bad format character was done     using BUG(), which crashes Xen. One path, via the VCPUOP_initialise hypercall, has a bad format character.
    The BUG() can be hit if VCPUOP_initialise executes for a sufficiently long period of time for a     continuation to be created. Malicious guests may cause a hypervisor crash, resulting in a Denial of     Service (DoS). Xen versions 4.6 and newer are vulnerable. Xen versions 4.5 and earlier are not vulnerable.
    Only x86 PV guests can exploit the vulnerability. HVM and PVH guests, and guests on ARM systems, cannot     exploit the vulnerability. (CVE-2019-18420)

  - An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to gain host OS privileges by     leveraging race conditions in pagetable promotion and demotion operations. There are issues with     restartable PV type change operations. To avoid using shadow pagetables for PV guests, Xen exposes the     actual hardware pagetables to the guest. In order to prevent the guest from modifying these page tables     directly, Xen keeps track of how pages are used using a type system; pages must be promoted before being     used as a pagetable, and demoted before being used for any other type. Xen also allows for recursive     promotions: i.e., an operating system promoting a page to an L4 pagetable may end up causing pages to be     promoted to L3s, which may in turn cause pages to be promoted to L2s, and so on. These operations may take     an arbitrarily large amount of time, and so must be re-startable. Unfortunately, making recursive     pagetable promotion and demotion operations restartable is incredibly complicated, and the code contains     several races which, if triggered, can cause Xen to drop or retain extra type counts, potentially allowing     guests to get write access to in-use pagetables. A malicious PV guest administrator may be able to     escalate their privilege to that of the host. All x86 systems with untrusted PV guests are vulnerable. HVM     and PVH guests cannot exercise this vulnerability. (CVE-2019-18421)

  - An issue was discovered in Xen through 4.12.x allowing attackers to gain host OS privileges via DMA in a     situation where an untrusted domain has access to a physical device. This occurs because passed through     PCI devices may corrupt host memory after deassignment. When a PCI device is assigned to an untrusted     domain, it is possible for that domain to program the device to DMA to an arbitrary address. The IOMMU is     used to protect the host from malicious DMA by making sure that the device addresses can only target     memory assigned to the guest. However, when the guest domain is torn down, or the device is deassigned,     the device is assigned back to dom0, thus allowing any in-flight DMA to potentially target critical host     data. An untrusted domain with access to a physical device can DMA into host memory, leading to privilege     escalation. Only systems where guests are given direct access to physical devices capable of DMA (PCI     pass-through) are vulnerable. Systems which do not use PCI pass-through are not vulnerable.
    (CVE-2019-18424)

  - An issue was discovered in Xen through 4.12.x allowing 32-bit PV guest OS users to gain guest OS     privileges by installing and using descriptors. There is missing descriptor table limit checking in x86 PV     emulation. When emulating certain PV guest operations, descriptor table accesses are performed by the     emulating code. Such accesses should respect the guest specified limits, unless otherwise guaranteed to     fail in such a case. Without this, emulation of 32-bit guest user mode calls through call gates would     allow guest user mode to install and then use descriptors of their choice, as long as the guest kernel did     not itself install an LDT. (Most OSes don't install any LDT by default). 32-bit PV guest user mode can     elevate its privileges to that of the guest kernel. Xen versions from at least 3.2 onwards are affected.
    Only 32-bit PV guest user mode can leverage this vulnerability. HVM, PVH, as well as 64-bit PV guests     cannot leverage this vulnerability. Arm systems are unaffected. (CVE-2019-18425)

  - An issue was discovered in Xen through 4.12.x allowing x86 AMD HVM guest OS users to cause a denial of     service or possibly gain privileges by triggering data-structure access during pagetable-height updates.
    When running on AMD systems with an IOMMU, Xen attempted to dynamically adapt the number of levels of     pagetables (the pagetable height) in the IOMMU according to the guest's address space size. The code to     select and update the height had several bugs. Notably, the update was done without taking a lock which is     necessary for safe operation. A malicious guest administrator can cause Xen to access data structures     while they are being modified, causing Xen to crash. Privilege escalation is thought to be very difficult     but cannot be ruled out. Additionally, there is a potential memory leak of 4kb per guest boot, under     memory pressure. Only Xen on AMD CPUs is vulnerable. Xen running on Intel CPUs is not vulnerable. ARM     systems are not vulnerable. Only systems where guests are given direct access to physical devices are     vulnerable. Systems which do not use PCI pass-through are not vulnerable. Only HVM guests can exploit the     vulnerability. PV and PVH guests cannot. All versions of Xen with IOMMU support are vulnerable.
    (CVE-2019-19577)

  - An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service     via degenerate chains of linear pagetables, because of an incorrect fix for CVE-2017-15595. Linear     pagetables is a technique which involves either pointing a pagetable at itself, or to another pagetable     of the same or higher level. Xen has limited support for linear pagetables: A page may either point to     itself, or point to another pagetable of the same level (i.e., L2 to L2, L3 to L3, and so on). XSA-240     introduced an additional restriction that limited the depth of such chains by allowing pages to either
    *point to* other pages of the same level, or *be pointed to* by other pages of the same level, but not     both. To implement this, we keep track of the number of outstanding times a page points to or is pointed     to another page table, to prevent both from happening at the same time. Unfortunately, the original commit     introducing this reset this count when resuming validation of a partially-validated pagetable, incorrectly     dropping some linear_pt_entry counts. If an attacker could engineer such a situation to occur, they     might be able to make loops or other arbitrary chains of linear pagetables, as described in XSA-240. A     malicious or buggy PV guest may cause the hypervisor to crash, resulting in Denial of Service (DoS)     affecting the entire host. Privilege escalation and information leaks cannot be excluded. All versions of     Xen are vulnerable. Only x86 systems are affected. Arm systems are not affected. Only x86 PV guests can     leverage the vulnerability. x86 HVM and PVH guests cannot leverage the vulnerability. Only systems which     have enabled linear pagetables are vulnerable. Systems which have disabled linear pagetables, either by     selecting CONFIG_PV_LINEAR_PT=n when building the hypervisor, or adding pv-linear-pt=false on the command-     line, are not vulnerable. (CVE-2019-19578)

  - An issue was discovered in Xen through 4.12.x allowing attackers to gain host OS privileges via DMA in a     situation where an untrusted domain has access to a physical device (and assignable-add is not used),     because of an incomplete fix for CVE-2019-18424. XSA-302 relies on the use of libxl's assignable-add     feature to prepare devices to be assigned to untrusted guests. Unfortunately, this is not considered a     strictly required step for device assignment. The PCI passthrough documentation on the wiki describes     alternate ways of preparing devices for assignment, and libvirt uses its own ways as well. Hosts where     these alternate methods are used will still leave the system in a vulnerable state after the device     comes back from a guest. An untrusted domain with access to a physical device can DMA into host memory,     leading to privilege escalation. Only systems where guests are given direct access to physical devices     capable of DMA (PCI pass-through) are vulnerable. Systems which do not use PCI pass-through are not     vulnerable. (CVE-2019-19579)

  - An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to gain host OS privileges by     leveraging race conditions in pagetable promotion and demotion operations, because of an incomplete fix     for CVE-2019-18421. XSA-299 addressed several critical issues in restartable PV type change operations.
    Despite extensive testing and auditing, some corner cases were missed. A malicious PV guest administrator     may be able to escalate their privilege to that of the host. All security-supported versions of Xen are     vulnerable. Only x86 systems are affected. Arm systems are not affected. Only x86 PV guests can leverage     the vulnerability. x86 HVM and PVH guests cannot leverage the vulnerability. Note that these attacks     require very precise timing, which may be difficult to exploit in practice. (CVE-2019-19580)

  - An issue was discovered in Xen through 4.12.x allowing x86 HVM/PVH guest OS users to cause a denial of     service (guest OS crash) because VMX VMEntry checks mishandle a certain case. Please see XSA-260 for     background on the MovSS shadow. Please see XSA-156 for background on the need for #DB interception. The     VMX VMEntry checks do not like the exact combination of state which occurs when #DB in intercepted, Single     Stepping is active, and blocked by STI/MovSS is active, despite this being a legitimate state to be in.
    The resulting VMEntry failure is fatal to the guest. HVM/PVH guest userspace code may be able to crash the     guest, resulting in a guest Denial of Service. All versions of Xen are affected. Only systems supporting     VMX hardware virtual extensions (Intel, Cyrix, or Zhaoxin CPUs) are affected. Arm and AMD systems are     unaffected. Only HVM/PVH guests are affected. PV guests cannot leverage the vulnerability.
    (CVE-2019-19583)

  - An issue was discovered in xenoprof in Xen through 4.13.x, allowing guest OS users (without active     profiling) to obtain sensitive information about other guests. Unprivileged guests can request to map     xenoprof buffers, even if profiling has not been enabled for those guests. These buffers were not     scrubbed. (CVE-2020-11740)

  - An issue was discovered in xenoprof in Xen through 4.13.x, allowing guest OS users (with active profiling)     to obtain sensitive information about other guests, cause a denial of service, or possibly gain     privileges. For guests for which active profiling was enabled by the administrator, the xenoprof code     uses the standard Xen shared ring structure. Unfortunately, this code did not treat the guest as a     potential adversary: it trusts the guest not to modify buffer size information or modify head / tail     pointers in unexpected ways. This can crash the host (DoS). Privilege escalation cannot be ruled out.
    (CVE-2020-11741)

  - An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service     because of bad continuation handling in GNTTABOP_copy. Grant table operations are expected to return 0 for     success, and a negative number for errors. The fix for CVE-2017-12135 introduced a path through grant copy     handling where success may be returned to the caller without any action taken. In particular, the status     fields of individual operations are left uninitialised, and may result in errant behaviour in the caller     of GNTTABOP_copy. A buggy or malicious guest can construct its grant table in such a way that, when a     backend domain tries to copy a grant, it hits the incorrect exit path. This returns success to the caller     without doing anything, which may cause crashes or other incorrect behaviour. (CVE-2020-11742)

  - tftp.c in libslirp 4.1.0, as used in QEMU 4.2.0, does not prevent ..\ directory traversal on Windows.
    (CVE-2020-7211)

  - In libslirp 4.1.0, as used in QEMU 4.2.0, tcp_subr.c misuses snprintf return values, leading to a buffer     overflow in later code. (CVE-2020-8608)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
130995	Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2019-4837)	Nessus	Oracle Linux Local Security Checks	11/14/2019	2/9/2026	medium
131007	Scientific Linux Security Update : kernel on SL7.x x86_64 (20191113)	Nessus	Scientific Linux Local Security Checks	11/14/2019	2/24/2020	medium
131011	Ubuntu 19.10 : Linux kernel vulnerability (USN-4183-2)	Nessus	Ubuntu Local Security Checks	11/14/2019	4/11/2024	critical
131059	openSUSE Security Update : qemu (openSUSE-2019-2505)	Nessus	SuSE Local Security Checks	11/15/2019	1/19/2021	medium
131143	Fedora 31 : xen (2019-376ec5c107)	Nessus	Fedora Local Security Checks	11/20/2019	4/11/2024	critical
131177	RHEL 8 : kpatch-patch (RHSA-2019:3936)	Nessus	Red Hat Local Security Checks	11/21/2019	11/7/2024	medium
131272	Oracle Linux 8 : kernel (ELSA-2019-3832)	Nessus	Oracle Linux Local Security Checks	11/25/2019	2/9/2026	medium
131743	Oracle Linux 7 : microcode_ctl (ELSA-2019-4867)	Nessus	Oracle Linux Local Security Checks	12/6/2019	10/22/2024	medium
132530	Photon OS 3.0: Linux PHSA-2019-3.0-0041	Nessus	PhotonOS Local Security Checks	12/31/2019	8/22/2025	critical
133221	RHEL 8 : kernel (RHSA-2020:0204)	Nessus	Red Hat Local Security Checks	1/24/2020	11/7/2024	critical
164602	Nutanix AOS : Multiple Vulnerabilities (NXSA-AOS-5.11.3)	Nessus	Misc.	9/1/2022	2/21/2026	critical
150584	SUSE SLES11 Security Update : xen (SUSE-SU-2020:14444-1)	Nessus	SuSE Local Security Checks	6/10/2021	6/10/2021	critical

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