Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2018-4196) (Foreshadow)

medium Nessus Plugin ID 111726
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.


The remote Oracle Linux host is missing one or more security updates.


Description of changes:

- inet: frag: enforce memory limits earlier (Eric Dumazet) [Orabug: 28450977]
- x86/mm/pageattr.c: fix page prot mask (Mihai Carabas) [Orabug: 28492122]
- x86/pgtable.h: fix PMD/PUD mask (Mihai Carabas) [Orabug: 28492122]
- x86/asm: Add pud/pmd mask interfaces to handle large PAT bit (Toshi Kani) [Orabug: 28492122]

- kvm/vmx: Don't mark vmx_exit() __exit (Boris Ostrovsky) [Orabug: 28491688]
- x86/speculation: Don't mark cpu_no_l1tf __initconst (Boris Ostrovsky) [Orabug: 28491688]
- x86/speculation: parse l1tf boot parameter early (Boris Ostrovsky) [Orabug: 28491688]

- posix-timer: Properly check sigevent->sigev_notify (Thomas Gleixner) [Orabug: 28481412] {CVE-2017-18344}

- x86/mm/kmmio: Make the tracer robust against L1TF (Andi Kleen) [Orabug: 28220674] {CVE-2018-3620}
- x86/mm/pat: Make set_memory_np() L1TF safe (Andi Kleen) [Orabug: 28220674] {CVE-2018-3620}
- x86/mm/pat: Ensure cpa->pfn only contains page frame numbers (Matt Fleming) [Orabug: 28220674] {CVE-2018-3620}
- x86/speculation/l1tf: Make pmd/pud_mknotpresent() invert (Andi Kleen) [Orabug: 28220674] {CVE-2018-3620}
- x86/speculation/l1tf: Invert all not present mappings (Andi Kleen) [Orabug: 28220674] {CVE-2018-3620}
- cpu/hotplug: Fix SMT supported evaluation (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3620}
- KVM: VMX: Tell the nested hypervisor to skip L1D flush on vmentry (Paolo Bonzini) [Orabug: 28220674] {CVE-2018-3646}
- x86/speculation: Use ARCH_CAPABILITIES to skip L1D flush on vmentry (Paolo Bonzini) [Orabug: 28220674] {CVE-2018-3620}
- KVM/VMX: Emulate MSR_IA32_ARCH_CAPABILITIES (KarimAllah Ahmed) [Orabug: 28220674] {CVE-2018-3646}
- x86/speculation: Simplify sysfs report of VMX L1TF vulnerability (Paolo Bonzini) [Orabug: 28220674] {CVE-2018-3620}
- Documentation/l1tf: Remove Yonah processors from not vulnerable list (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3620}
- x86/KVM/VMX: Don't set l1tf_flush_l1d from vmx_handle_external_intr() (Nicolai Stange) [Orabug: 28220674] {CVE-2018-3646}
- x86/irq: Let interrupt handlers set kvm_cpu_l1tf_flush_l1d (Nicolai Stange) [Orabug: 28220674] {CVE-2018-3646}
- x86: Don't include linux/irq.h from asm/hardirq.h (Nicolai Stange) [Orabug: 28220625] {CVE-2018-3620}
- x86/KVM/VMX: Introduce per-host-cpu analogue of l1tf_flush_l1d (Nicolai Stange) [Orabug: 28220625] {CVE-2018-3646}
- x86/KVM/VMX: Move the l1tf_flush_l1d test to vmx_l1d_flush() (Nicolai Stange) [Orabug: 28220625] {CVE-2018-3646}
- x86/KVM/VMX: Replace 'vmx_l1d_flush_always' with 'vmx_l1d_flush_cond' (Nicolai Stange) [Orabug: 28220625] {CVE-2018-3646}
- x86/KVM/VMX: Don't set l1tf_flush_l1d to true from vmx_l1d_flush() (Nicolai Stange) [Orabug: 28220625] {CVE-2018-3646}
- KVM: VMX: support MSR_IA32_ARCH_CAPABILITIES as a feature MSR (Paolo Bonzini) [Orabug: 28220625] {CVE-2018-3646}
- KVM: X86: Introduce kvm_get_msr_feature() (Wanpeng Li) [Orabug: 28220674] {CVE-2018-3646}
- KVM: x86: Add a framework for supporting MSR-based features (Tom Lendacky) [Orabug: 28220674] {CVE-2018-3646}
- cpu/hotplug: detect SMT disabled by BIOS (Josh Poimboeuf) [Orabug: 28220674] {CVE-2018-3620}
- Documentation/l1tf: Fix typos (Tony Luck) [Orabug: 28220674] {CVE-2018-3620}
- x86/KVM/VMX: Initialize the vmx_l1d_flush_pages' content (Nicolai Stange) [Orabug: 28220674] {CVE-2018-3646}
- x86/speculation/l1tf: Unbreak !__HAVE_ARCH_PFN_MODIFY_ALLOWED architectures (Jiri Kosina) [Orabug: 28220674] {CVE-2018-3620}
- Documentation: Add section about CPU vulnerabilities (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3620}
- x86/bugs, kvm: Introduce boot-time control of L1TF mitigations (Jiri Kosina) [Orabug: 28220674] {CVE-2018-3646}
- cpu/hotplug: Set CPU_SMT_NOT_SUPPORTED early (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3620}
- cpu/hotplug: Expose SMT control init function (Jiri Kosina) [Orabug: 28220674] {CVE-2018-3620}
- x86/kvm: Allow runtime control of L1D flush (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3646}
- x86/kvm: Serialize L1D flush parameter setter (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3646}
- x86/kvm: Add static key for flush always (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3646}
- x86/kvm: Move l1tf setup function (Thomas Gleixner) [Orabug: 28220625] {CVE-2018-3646}
- x86/l1tf: Handle EPT disabled state proper (Thomas Gleixner) [Orabug: 28220625] {CVE-2018-3620}
- x86/kvm: Drop L1TF MSR list approach (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3646}
- x86/litf: Introduce vmx status variable (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3620}
- cpu/hotplug: Online siblings when SMT control is turned on (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3620}
- x86/KVM/VMX: Use MSR save list for IA32_FLUSH_CMD if required (Konrad Rzeszutek Wilk) [Orabug: 28220674] {CVE-2018-3646}
- x86/KVM/VMX: Extend add_atomic_switch_msr() to allow VMENTER only MSRs (Konrad Rzeszutek Wilk) [Orabug: 28220674] {CVE-2018-3646}
- x86/KVM/VMX: Separate the VMX AUTOLOAD guest/host number accounting (Konrad Rzeszutek Wilk) [Orabug: 28220674] {CVE-2018-3646}
- x86/KVM/VMX: Add find_msr() helper function (Konrad Rzeszutek Wilk) [Orabug: 28220674] {CVE-2018-3646}
- x86/KVM/VMX: Split the VMX MSR LOAD structures to have an host/guest numbers (Konrad Rzeszutek Wilk) [Orabug: 28220674] {CVE-2018-3646}
- x86/KVM/VMX: Add L1D flush logic (Paolo Bonzini) [Orabug: 28220674] {CVE-2018-3646}
- x86/KVM/VMX: Add L1D MSR based flush (Paolo Bonzini) [Orabug: 28220674] {CVE-2018-3646}
- x86/KVM/VMX: Add L1D flush algorithm (Paolo Bonzini) [Orabug: 28220674] {CVE-2018-3646}
- x86/KVM/VMX: Add module argument for L1TF mitigation (Konrad Rzeszutek Wilk) [Orabug: 28220674] {CVE-2018-3646} {CVE-2018-3646}
- locking/static_keys: Add static_key_{en,dis}able() helpers (Peter Zijlstra) [Orabug: 28220674] {CVE-2018-3620}
- x86/KVM: Warn user if KVM is loaded SMT and L1TF CPU bug being present (Konrad Rzeszutek Wilk) [Orabug: 28220674] {CVE-2018-3646}
- KVM: x86: Introducing kvm_x86_ops VM init/destroy hooks (Suravee Suthikulpanit) [Orabug: 28220674] {CVE-2018-3646}
- cpu/hotplug: Boot HT siblings at least once (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3620}
- Revert 'x86/apic: Ignore secondary threads if nosmt=force' (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3620}
- x86/speculation/l1tf: Fix up pte->pfn conversion for PAE (Michal Hocko) [Orabug: 28220674] {CVE-2018-3620}
- x86/speculation/l1tf: Protect PAE swap entries against L1TF (Vlastimil Babka) [Orabug: 28220674] {CVE-2018-3620}
- x86/CPU/AMD: Move TOPOEXT reenablement before reading smp_num_siblings (Borislav Petkov) [Orabug: 28220674] {CVE-2018-3620}
- x86/cpufeatures: Add detection of L1D cache flush support. (Konrad Rzeszutek Wilk) [Orabug: 28220674] {CVE-2018-3620}
- x86/speculation/l1tf: Extend 64bit swap file size limit (Vlastimil Babka) [Orabug: 28220674] {CVE-2018-3620}
- x86/apic: Ignore secondary threads if nosmt=force (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3620}
- x86/cpu/AMD: Evaluate smp_num_siblings early (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3620}
- x86/CPU/AMD: Do not check CPUID max ext level before parsing SMP info (Borislav Petkov) [Orabug: 28220674] {CVE-2018-3620}
- x86/cpu/intel: Evaluate smp_num_siblings early (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3620}
- x86/cpu/topology: Provide detect_extended_topology_early() (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3620}
- x86/cpu/common: Provide detect_ht_early() (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3620}
- x86/cpu/AMD: Remove the pointless detect_ht() call (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3620}
- x86/cpu: Remove the pointless CPU printout (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3620}
- cpu/hotplug: Provide knobs to control SMT (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3620}
- x86/topology: Add topology_max_smt_threads() (Andi Kleen) [Orabug: 28220674] {CVE-2018-3620}
- cpu/hotplug: Split do_cpu_down() (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3620}
- x86/topology: Provide topology_smt_supported() (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3620}
- x86/smp: Provide topology_is_primary_thread() (Thomas Gleixner) [Orabug: 28220674] {CVE-2018-3620}
- x86/bugs: Move the l1tf function and define pr_fmt properly (Konrad Rzeszutek Wilk) [Orabug: 28220674] {CVE-2018-3620}
- x86/speculation/l1tf: Limit swap file size to MAX_PA/2 (Andi Klein) [Orabug: 28220674] {CVE-2018-3620}
- x86/speculation/l1tf: Disallow non privileged high MMIO PROT_NONE mappings (Andi Klein) [Orabug: 28220674] {CVE-2018-3620}
- x86/speculation/l1tf: Add sysfs reporting for l1tf (Andi Klein) [Orabug: 28220674] {CVE-2018-3620}
- x86/speculation/l1tf: Make sure the first page is always reserved (Andi Klein) [Orabug: 28220674] {CVE-2018-3620}
- x86/speculation/l1tf: Protect PROT_NONE PTEs against speculation (Andi Klein) [Orabug: 28220674] {CVE-2018-3620}
- x86/speculation/l1tf: Protect swap entries against L1TF (Linus Torvalds) [Orabug: 28220674] {CVE-2018-3620}
- x86/speculation/l1tf: Change order of offset/type in swap entry (Linus Torvalds) [Orabug: 28220674] {CVE-2018-3620}
- x86/speculation/l1tf: Increase 32bit PAE __PHYSICAL_PAGE_SHIFT (Andi Klein) [Orabug: 28220674] {CVE-2018-3620}
- x86/mm: Limit mmap() of /dev/mem to valid physical addresses (Craig Bergstrom) [Orabug: 28220674] {CVE-2018-3620}
- x86/mm: Prevent non-MAP_FIXED mapping across DEFAULT_MAP_WINDOW border (Kirill A. Shutemov) [Orabug: 28220674] {CVE-2018-3620}


Update the affected unbreakable enterprise kernel packages.

See Also

Plugin Details

Severity: Medium

ID: 111726

File Name: oraclelinux_ELSA-2018-4196.nasl

Version: 1.12

Type: local

Agent: unix

Published: 8/15/2018

Updated: 3/8/2021

Dependencies: ssh_get_info.nasl, linux_alt_patch_detect.nasl

Risk Information


Risk Factor: Medium

Score: 6.7


Risk Factor: Medium

Base Score: 4.7

Temporal Score: 3.9

Vector: AV:L/AC:M/Au:N/C:C/I:N/A:N

Temporal Vector: E:F/RL:OF/RC:C


Risk Factor: Medium

Base Score: 5.6

Temporal Score: 5.2

Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

Temporal Vector: E:F/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:oracle:linux:kernel-uek, p-cpe:/a:oracle:linux:kernel-uek-debug, p-cpe:/a:oracle:linux:kernel-uek-debug-devel, p-cpe:/a:oracle:linux:kernel-uek-devel, p-cpe:/a:oracle:linux:kernel-uek-doc, p-cpe:/a:oracle:linux:kernel-uek-firmware, cpe:/o:oracle:linux:6, cpe:/o:oracle:linux:7

Required KB Items: Host/local_checks_enabled, Host/OracleLinux, Host/RedHat/release, Host/RedHat/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/14/2018

Vulnerability Publication Date: 7/26/2018

Exploitable With


Reference Information

CVE: CVE-2017-18344, CVE-2018-3620, CVE-2018-3646