Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.

  - CVE-2017-8824     Mohamed Ghannam discovered that the DCCP implementation     did not correctly manage resources when a socket is     disconnected and reconnected, potentially leading to a     use-after-free. A local user could use this for denial     of service (crash or data corruption) or possibly for     privilege escalation. On systems that do not already     have the dccp module loaded, this can be mitigated by     disabling it:echo >> /etc/modprobe.d/disable-dccp.conf     install dccp false

  - CVE-2017-16538     Andrey Konovalov reported that the dvb-usb-lmedm04 media     driver did not correctly handle some error conditions     during initialisation. A physically present user with a     specially designed USB device can use this to cause a     denial of service (crash).

  - CVE-2017-16644     Andrey Konovalov reported that the hdpvr media driver     did not correctly handle some error conditions during     initialisation. A physically present user with a     specially designed USB device can use this to cause a     denial of service (crash).

  - CVE-2017-16995     Jann Horn discovered that the Extended BPF verifier did     not correctly model the behaviour of 32-bit load     instructions. A local user can use this for privilege     escalation.

  - CVE-2017-17448     Kevin Cernekee discovered that the netfilter subsystem     allowed users with the CAP_NET_ADMIN capability in any     user namespace, not just the root namespace, to enable     and disable connection tracking helpers. This could lead     to denial of service, violation of network security     policy, or have other impact.

  - CVE-2017-17449     Kevin Cernekee discovered that the netlink subsystem     allowed users with the CAP_NET_ADMIN capability in any     user namespace to monitor netlink traffic in all net     namespaces, not just those owned by that user namespace.
    This could lead to exposure of sensitive information.

  - CVE-2017-17450     Kevin Cernekee discovered that the xt_osf module allowed     users with the CAP_NET_ADMIN capability in any user     namespace to modify the global OS fingerprint list.

  - CVE-2017-17558     Andrey Konovalov reported that that USB core did not     correctly handle some error conditions during     initialisation. A physically present user with a     specially designed USB device can use this to cause a     denial of service (crash or memory corruption), or     possibly for privilege escalation.

  - CVE-2017-17712     Mohamed Ghannam discovered a race condition in the IPv4     raw socket implementation. A local user could use this     to obtain sensitive information from the kernel.

  - CVE-2017-17741     Dmitry Vyukov reported that the KVM implementation for     x86 would over-read data from memory when emulating an     MMIO write if the kvm_mmio tracepoint was enabled. A     guest virtual machine might be able to use this to cause     a denial of service (crash).

  - CVE-2017-17805     It was discovered that some implementations of the     Salsa20 block cipher did not correctly handle     zero-length input. A local user could use this to cause     a denial of service (crash) or possibly have other     security impact.

  - CVE-2017-17806     It was discovered that the HMAC implementation could be     used with an underlying hash algorithm that requires a     key, which was not intended. A local user could use this     to cause a denial of service (crash or memory     corruption), or possibly for privilege escalation.

  - CVE-2017-17807     Eric Biggers discovered that the KEYS subsystem lacked a     check for write permission when adding keys to a     process's default keyring. A local user could use this     to cause a denial of service or to obtain sensitive     information.

  - CVE-2017-17862     Alexei Starovoitov discovered that the Extended BPF     verifier ignored unreachable code, even though it would     still be processed by JIT compilers. This could possibly     be used by local users for denial of service. It also     increases the severity of bugs in determining     unreachable code.

  - CVE-2017-17863     Jann Horn discovered that the Extended BPF verifier did     not correctly model pointer arithmetic on the stack     frame pointer. A local user can use this for privilege     escalation.

  - CVE-2017-17864     Jann Horn discovered that the Extended BPF verifier     could fail to detect pointer leaks from conditional     code. A local user could use this to obtain sensitive     information in order to exploit other vulnerabilities.

  - CVE-2017-1000407     Andrew Honig reported that the KVM implementation for     Intel processors allowed direct access to host I/O port     0x80, which is not generally safe. On some systems this     allows a guest VM to cause a denial of service (crash)     of the host.

  - CVE-2017-1000410     Ben Seri reported that the Bluetooth subsystem did not     correctly handle short EFS information elements in L2CAP     messages. An attacker able to communicate over Bluetooth     could use this to obtain sensitive information from the     kernel.

The various problems in the Extended BPF verifier can be mitigated by disabling use of Extended BPF by unprivileged users:sysctl kernel.unprivileged_bpf_disabled=1

Debian disables unprivileged user namespaces by default, but if they are enabled (via the kernel.unprivileged_userns_clone sysctl) then CVE-2017-17448 can be exploited by any local user.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:1130 advisory.

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

    Security Fix(es):

    * kernel: Use-after-free vulnerability in DCCP socket (CVE-2017-8824, Important)

    * kernel: v4l2: disabled memory access protection mechanism allowing privilege escalation (CVE-2017-13166,     Important)

    * kernel: Incorrect type conversion for size during dma allocation (CVE-2017-9725, Moderate)

    * kernel: Use-after-free in snd_seq_ioctl_create_port() (CVE-2017-15265, Moderate)

    * kernel: Missing namespace check in net/netlink/af_netlink.c allows for network monitors to observe     systemwide activity (CVE-2017-17449, Moderate)

    * kernel: netfilter: use-after-free in tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c     (CVE-2017-18017, Moderate)

    * kernel: kvm: Reachable BUG() on out-of-bounds guest IRQ (CVE-2017-1000252, Moderate)

    * kernel: Stack information leak in the EFS element (CVE-2017-1000410, Moderate)

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

    Red Hat would like to thank Mohamed Ghannam for reporting CVE-2017-8824; Jan H. Schnherr (Amazon) for     reporting CVE-2017-1000252; and Armis Labs for reporting CVE-2017-1000410.

    Bug Fix(es):

    These updated kernel packages include also numerous bug fixes. Space precludes documenting all of these     bug fixes in this advisory. See the bug fix descriptions in the related Knowledge Article:
    https://access.redhat.com/articles/3411331

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 OracleVM system is missing necessary patches to address critical security updates : please see Oracle VM Security Advisory OVMSA-2018-0035 for details.

The remote Oracle Linux 6 / 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2018-4025 advisory.

    - dccp: CVE-2017-8824: use-after-free in DCCP code (Mohamed Ghannam)  [Orabug: 27290300]  {CVE-2017-8824}
    - ALSA: pcm: prevent UAF in snd_pcm_info (Robb Glasser)  [Orabug: 27344841]  {CVE-2017-0861}     {CVE-2017-0861}
    - assoc_array: Fix a buggy node-splitting case (David Howells)  [Orabug: 27364592]  {CVE-2017-12193}     {CVE-2017-12193}
    - Sanitize move_pages() permission checks (Linus Torvalds)  [Orabug: 27364690]  {CVE-2017-14140}
    - pti: compile fix for when PTI is disabled (Pavel Tatashin)  [Orabug: 27383147]  {CVE-2017-5754}
    - sctp: do not peel off an assoc from one netns to another one (Xin Long)  [Orabug: 27386999]     {CVE-2017-15115}
    - net: ipv4: fix for a race condition in raw_sendmsg (Mohamed Ghannam)  [Orabug: 27390682]     {CVE-2017-17712}

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 OracleVM system is missing necessary patches to address critical security updates :

  - drivers/char/mem.c: deny access in open operation when     securelevel is set (Ethan Zhao) [Orabug: 27234850]     [Orabug: 27234850]

  - hugetlb: fix nr_pmds accounting with shared page tables     (Kirill A. Shutemov) [Orabug: 26988581]

  - x86/IBRS: Drop unnecessary WRITE_ONCE (Boris Ostrovsky)     [Orabug: 27416198]

  - x86/IBRS: Don't try to change IBRS mode if IBRS is not     available (Boris Ostrovsky) [Orabug: 27416198]

  - x86/IBRS: Remove support for IBRS_ENABLED_USER mode     (Boris Ostrovsky) 

  - x86: Include linux/device.h in bugs_64.c (Boris     Ostrovsky) [Orabug: 27418896]

  - x86/spectre: Drop the warning about ibrs being obsolete.
    (Konrad Rzeszutek Wilk)

  - x86/spec: Don't print the Missing arguments for option     spectre_v2. (Konrad Rzeszutek Wilk)

  - x86/spec: Also print IBRS if IBPB is disabled. (Konrad     Rzeszutek Wilk)

  - x86/IBPB: Provide debugfs interface for changing IBPB     mode (Boris Ostrovsky) [Orabug: 27449065]

  - xen: Make PV Dom0 Linux kernel NUMA aware (Elena     Ufimtseva)

  - net/rds: Fix incorrect error handling (H&aring kon     Bugge) [Orabug: 26848729]

  - net/rds: use multiple sge than buddy allocation in     congestion code (Wei Lin Guay) [Orabug: 26848729]

  - Revert 'RDS: fix the sg allocation based on actual     message size' (Wei Lin Guay) [Orabug: 26848729]

  - Revert 'RDS: avoid large pages for sg allocation for TCP     transport' (Wei Lin Guay) [Orabug: 26848729]

  - Revert 'net/rds: Reduce memory footprint in rds_sendmsg'     (Wei Lin Guay) [Orabug: 26848729]

  - net/rds: reduce memory footprint during ib_post_recv in     IB transport (Wei Lin Guay) [Orabug: 26848729]

  - net/rds: reduce memory footprint during rds_sendmsg with     IB transport (Wei Lin Guay) [Orabug: 26848729]

  - net/rds: set the rds_ib_init_frag based on supported sge     (Wei Lin Guay) [Orabug: 26848729]

  - bnxt_en: Fix possible corrupted NVRAM parameters from     firmware response. (Michael Chan) [Orabug: 27199588]

  - x86, kasan: Fix build failure on KASAN=y && KMEMCHECK=y     kernels (Andrey Ryabinin) [Orabug: 27255122]

  - x86, efi, kasan: Fix build failure on !KASAN &&     KMEMCHECK=y kernels (Andrey Ryabinin) [Orabug: 27255122]

  - x86, efi, kasan: #undef memset/memcpy/memmove per arch     (Andrey Ryabinin) [Orabug: 27255122]

  - Revert 'Makefile: Build with -Werror=date-time if the     compiler supports it' (Gayatri Vasudevan) [Orabug:
    27255122]

  - dccp: CVE-2017-8824: use-after-free in DCCP code     (Mohamed Ghannam) [Orabug: 27290300] (CVE-2017-8824)

  - x86/efi: Initialize and display UEFI secure boot state a     bit later during init (Daniel Kiper) [Orabug: 27309477]

  - x86/espfix: Init espfix on the boot CPU side (Zhu     Guihua) [Orabug: 27344552]

  - x86/espfix: Add 'cpu' parameter to init_espfix_ap (Zhu     Guihua) 

  - ALSA: pcm: prevent UAF in snd_pcm_info (Robb Glasser)     [Orabug: 27344841] (CVE-2017-0861) (CVE-2017-0861)

  - fs/ocfs2: remove page cache for converted direct write     (Wengang Wang)

  - Revert 'ocfs2: code clean up for direct io' (Wengang     Wang)

  - assoc_array: Fix a buggy node-splitting case (David     Howells) [Orabug: 27364592] (CVE-2017-12193)     (CVE-2017-12193)

  - Sanitize 'move_pages' permission checks (Linus Torvalds)     [Orabug: 27364690] (CVE-2017-14140)

  - pti: compile fix for when PTI is disabled (Pavel     Tatashin) [Orabug: 27383147] (CVE-2017-5754)

  - sctp: do not peel off an assoc from one netns to another     one (Xin Long) [Orabug: 27386999] (CVE-2017-15115)

  - net: ipv4: fix for a race condition in raw_sendmsg     (Mohamed Ghannam) [Orabug: 27390682] (CVE-2017-17712)

  - mlx4: add mstflint secure boot access kernel support     (Qing Huang) 

  - x86: Move STUFF_RSB in to the idt macro (Konrad     Rzeszutek Wilk)

  - x86/spec: STUFF_RSB _before_ ENABLE_IBRS (Konrad     Rzeszutek Wilk)

  - x86: Move ENABLE_IBRS in the interrupt macro. (Konrad     Rzeszutek Wilk)

The remote Ubuntu 14.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3583-1 advisory.

    It was discovered that an out-of-bounds write vulnerability existed in the Flash-Friendly File System     (f2fs) in the Linux kernel. An attacker could construct a malicious file system that, when mounted, could     cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-0750)

    It was discovered that a race condition leading to a use-after-free vulnerability existed in the ALSA PCM     subsystem of the Linux kernel. A local attacker could use this to cause a denial of service (system crash)     or possibly execute arbitrary code. (CVE-2017-0861)

    It was discovered that the KVM implementation in the Linux kernel allowed passthrough of the diagnostic     I/O port 0x80. An attacker in a guest VM could use this to cause a denial of service (system crash) in the     host OS. (CVE-2017-1000407)

    Bo Zhang discovered that the netlink wireless configuration interface in the Linux kernel did not properly     validate attributes when handling certain requests. A local attacker with the CAP_NET_ADMIN could use this     to cause a denial of service (system crash). (CVE-2017-12153)

    Vitaly Mayatskikh discovered that the SCSI subsystem in the Linux kernel did not properly track reference     counts when merging buffers. A local attacker could use this to cause a denial of service (memory     exhaustion). (CVE-2017-12190)

    It was discovered that the key management subsystem in the Linux kernel did not properly restrict key     reads on negatively instantiated keys. A local attacker could use this to cause a denial of service     (system crash). (CVE-2017-12192)

    It was discovered that an integer overflow existed in the sysfs interface for the QLogic 24xx+ series SCSI     driver in the Linux kernel. A local privileged attacker could use this to cause a denial of service     (system crash). (CVE-2017-14051)

    Otto Ebeling discovered that the memory manager in the Linux kernel did not properly check the effective     UID in some situations. A local attacker could use this to expose sensitive information. (CVE-2017-14140)

    It was discovered that the ATI Radeon framebuffer driver in the Linux kernel did not properly initialize a     data structure returned to user space. A local attacker could use this to expose sensitive information     (kernel memory). (CVE-2017-14156)

    ChunYu Wang discovered that the iSCSI transport implementation in the Linux kernel did not properly     validate data structures. A local attacker could use this to cause a denial of service (system crash).
    (CVE-2017-14489)

    James Patrick-Evans discovered a race condition in the LEGO USB Infrared Tower driver in the Linux kernel.
    A physically proximate attacker could use this to cause a denial of service (system crash) or possibly     execute arbitrary code. (CVE-2017-15102)

    ChunYu Wang discovered that a use-after-free vulnerability existed in the SCTP protocol 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-2017-15115)

    It was discovered that the key management subsystem in the Linux kernel did not properly handle NULL     payloads with non-zero length values. A local attacker could use this to cause a denial of service (system     crash). (CVE-2017-15274)

    It was discovered that the Bluebooth Network Encapsulation Protocol (BNEP) implementation in the Linux     kernel did not validate the type of socket passed in the BNEPCONNADD ioctl(). A local attacker with the     CAP_NET_ADMIN privilege could use this to cause a denial of service (system crash) or possibly execute     arbitrary code. (CVE-2017-15868)

    Andrey Konovalov discovered a use-after-free vulnerability in the USB serial console driver in the Linux     kernel. A physically proximate attacker could use this to cause a denial of service (system crash) or     possibly execute arbitrary code. (CVE-2017-16525)

    It was discovered that the netfilter passive OS fingerprinting (xt_osf) module did not properly perform     access control checks. A local attacker could improperly modify the system-wide OS fingerprint list.
    (CVE-2017-17450)

    It was discovered that the HMAC implementation did not validate the state of the underlying cryptographic     hash algorithm. A local attacker could use this to cause a denial of service (system crash) or possibly     execute arbitrary code. (CVE-2017-17806)

    Denys Fedoryshchenko discovered a use-after-free vulnerability in the netfilter xt_TCPMSS filter of the     Linux kernel. A remote attacker could use this to cause a denial of service (system crash).
    (CVE-2017-18017)

    Gareth Evans discovered that the shm IPC subsystem in the Linux kernel did not properly restrict mapping     page zero. A local privileged attacker could use this to execute arbitrary code. (CVE-2017-5669)

    It was discovered that an integer overflow vulnerability existing in the IPv6 implementation in the Linux     kernel. A local attacker could use this to cause a denial of service (infinite loop). (CVE-2017-7542)

    Tommi Rantala and Brad Spengler discovered that the memory manager in the Linux kernel did not properly     enforce the CONFIG_STRICT_DEVMEM protection mechanism. A local attacker with access to /dev/mem could use     this to expose sensitive information or possibly execute arbitrary code. (CVE-2017-7889)

    Mohamed Ghannam discovered a use-after-free vulnerability in the DCCP protocol 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-2017-8824)

    Mohamed Ghannam discovered a null pointer dereference in the RDS (Reliable Datagram Sockets) protocol     implementation of the Linux kernel. A local attacker could use this to cause a denial of service (system     crash). (CVE-2018-5333)

     discovered that a race condition existed in loop block device 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-2018-5344)

    USN-3524-1 mitigated CVE-2017-5754 (Meltdown) for the amd64 architecture in Ubuntu 14.04 LTS. This update     provides the corresponding mitigations for the ppc64el architecture.

Tenable has extracted the preceding description block directly from the Ubuntu 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 5 / 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2018-4041 advisory.

    - KEYS: Remove key_type::match in favour of overriding default by match_preparse (Tim Tianyang Chen)     [Orabug: 25757946]  {CVE-2017-6951}
    - tcp: initialize rcv_mss to TCP_MIN_MSS instead of 0 (Wei Wang)  [Orabug: 26813391]  {CVE-2017-14106}
    - rxrpc: Fix several cases where a padded len isn't checked in ticket decode (David Howells)  [Orabug:
    26880520]  {CVE-2017-7482} {CVE-2017-7482}
    - USB: serial: console: fix use-after-free after failed setup (Johan Hovold)  [Orabug: 27206839]     {CVE-2017-16525}
    - ALSA: usb-audio: Check out-of-bounds access by corrupted buffer descriptor (Takashi Iwai)  [Orabug:
    27206934]  {CVE-2017-16529}
    - USB: fix out-of-bounds in usb_set_configuration (Greg Kroah-Hartman)  [Orabug: 27207243]     {CVE-2017-16531}

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.

ID	Name	Product	Family	Published	Updated	Severity
105433	Debian DSA-4073-1 : linux - security update	Nessus	Debian Local Security Checks	12/26/2017	1/4/2021	high
109116	RHEL 7 : kernel (RHSA-2018:1130)	Nessus	Red Hat Local Security Checks	4/18/2018	3/19/2025	critical
109158	OracleVM 3.4 : Unbreakable / etc (OVMSA-2018-0035) (Dirty COW) (Meltdown) (Spectre)	Nessus	OracleVM Local Security Checks	4/19/2018	10/30/2024	high
106670	Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2018-4025)	Nessus	Oracle Linux Local Security Checks	2/8/2018	10/23/2024	high
106706	OracleVM 3.4 : Unbreakable / etc (OVMSA-2018-0017) (Meltdown)	Nessus	OracleVM Local Security Checks	2/9/2018	9/27/2019	high
107003	Ubuntu 14.04 LTS : Linux kernel vulnerabilities (USN-3583-1)	Nessus	Ubuntu Local Security Checks	2/26/2018	10/29/2024	critical
105344	openSUSE Security Update : the Linux Kernel (openSUSE-2017-1390) (Dirty COW)	Nessus	SuSE Local Security Checks	12/18/2017	1/19/2021	high
107052	Oracle Linux 5 / 6 : Unbreakable Enterprise kernel (ELSA-2018-4041)	Nessus	Oracle Linux Local Security Checks	2/28/2018	11/1/2024	high

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