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Fencer Vulns
high 8.8

CVE-2026-64562 json

KVM: nVMX: Hide shadow VMCS right after VMCLEAR

published 2026-08-04 3 mo ago modified 2026-11-03 5 d ago also EUVD-2026-52603

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 5%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

KVM: nVMX: Hide shadow VMCS right after VMCLEAR

free_nested() frees the shadow VMCS while vmcs01 still points to it. But because it is asynchronous with respect to loaded_vmcs_clear(), the vCPU might migrate before the pointer is cleared and __loaded_vmcs_clear() may then execute VMCLEAR.

The VMCS needs to stay attached until its explicit VMCLEAR completes, but then it can be hidden and the page safely freed.

Patch / fix

  • Linux Linux 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6, 7.2
  • linux Debian 12 6.1.187-1
  • linux Debian 13 6.12.101-1
  • linux Debian 14 7.1.6-1
  • linux-6.12 Debian 12 6.12.101-1~deb12u1

debian advisories DEBIAN-CVE-2026-64562

  • linux Ubuntu 22.04 LTS 5.15.0-198.208
  • linux Ubuntu 24.04 LTS 6.8.0-147.147
  • linux Ubuntu 26.04 LTS 7.0.0-38.38
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1117.124
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1067.70
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1014.14
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1118.128
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1071.79

ubuntu advisories UBUNTU-CVE-2026-64562

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-64kb SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS, SLE High Performance Computing 15 SP5-ESPOS 5.14.21-150500.55.189.1
  • kernel-syms SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 5.14.21-150500.55.189.1
  • kernel-source SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 5.14.21-150500.55.189.1
  • kernel-default SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +3 more 5.14.21-150500.55.189.1
  • kernel-obs-build SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 5.14.21-150500.55.189.1
  • kernel-default-base SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 5.14.21-150500.55.189.1.150500.6.87.4
  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.81.1
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.81.1

suse advisories SUSE-SU-2026:4595-1SUSE-SU-2026:4254-1SUSE-SU-2026:4369-1SUSE-SU-2026:4347-1SUSE-SU-2026:4284-1SUSE-SU-2026:23887-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.38.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.38.1

opensuse advisories openSUSE-SU-2026:21910-1openSUSE-SU-2026:11476-1

  • kernel Azure Linux 3.0 6.6.150.1-1

azure linux advisories AZL-94404

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-64562 updated cvss 8.8

kernel: KVM: nVMX: Hide shadow VMCS right after VMCLEAR

  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.131.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.131.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.131.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.131.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.131.1.el9_6
    fixed: vendor fix RHSA-2026:49031
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.186.1.el9_2, rtla 5.14.0-284.186.1.el9_2, kernel-devel-matched 5.14.0-284.186.1.el9_2, kernel-64k-devel-matched 5.14.0-284.186.1.el9_2, kernel-debug-devel-matched 5.14.0-284.186.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.186.1.el9_2, +5 more
    fixed: vendor fix RHSA-2026:51603
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) rv 5.14.0-427.141.1.el9_4, perf 5.14.0-427.141.1.el9_4, rtla 5.14.0-427.141.1.el9_4, kernel-devel-matched 5.14.0-427.141.1.el9_4, kernel-64k-devel-matched 5.14.0-427.141.1.el9_4, kernel-debug-devel-matched 5.14.0-427.141.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:48386
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.94.1.el10_0, perf 6.12.0-55.94.1.el10_0, rtla 6.12.0-55.94.1.el10_0, python3-perf 6.12.0-55.94.1.el10_0, kernel-devel-matched 6.12.0-55.94.1.el10_0, kernel-64k-devel-matched 6.12.0-55.94.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:49030
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.131.1.el9_6, perf 5.14.0-570.131.1.el9_6, rtla 5.14.0-570.131.1.el9_6, python3-perf 5.14.0-570.131.1.el9_6, kernel-devel-matched 5.14.0-570.131.1.el9_6, kernel-64k-devel-matched 5.14.0-570.131.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:49031
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.201.1.el8_4, kernel 4.18.0-305.201.1.el8_4, bpftool 4.18.0-305.201.1.el8_4, kernel-core 4.18.0-305.201.1.el8_4, kernel-tools 4.18.0-305.201.1.el8_4, python3-perf 4.18.0-305.201.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:59091
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.214.1.el8_6, kernel 4.18.0-372.214.1.el8_6, bpftool 4.18.0-372.214.1.el8_6, kernel-core 4.18.0-372.214.1.el8_6, kernel-tools 4.18.0-372.214.1.el8_6, python3-perf 4.18.0-372.214.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:68131
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.156.1.el8_8, kernel 4.18.0-477.156.1.el8_8, bpftool 4.18.0-477.156.1.el8_8, kernel-core 4.18.0-477.156.1.el8_8, kernel-tools 4.18.0-477.156.1.el8_8, python3-perf 4.18.0-477.156.1.el8_8, +9 more
    fixed: vendor fix RHSA-2026:47869
show 17 more
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.186.1.el9_2, kernel 5.14.0-284.186.1.el9_2, kernel-64k 5.14.0-284.186.1.el9_2, kernel-core 5.14.0-284.186.1.el9_2, kernel-tools 5.14.0-284.186.1.el9_2, python3-perf 5.14.0-284.186.1.el9_2, +28 more
    fixed: vendor fix RHSA-2026:51603
  • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool 7.3.0-427.141.1.el9_4, kernel 5.14.0-427.141.1.el9_4, kernel-64k 5.14.0-427.141.1.el9_4, kernel-core 5.14.0-427.141.1.el9_4, kernel-tools 5.14.0-427.141.1.el9_4, python3-perf 5.14.0-427.141.1.el9_4, +28 more
    fixed: vendor fix RHSA-2026:48386
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.94.1.el10_0, kernel-64k 6.12.0-55.94.1.el10_0, kernel-core 6.12.0-55.94.1.el10_0, kernel-tools 6.12.0-55.94.1.el10_0, kernel-modules 6.12.0-55.94.1.el10_0, kernel-64k-core 6.12.0-55.94.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:49030
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.131.1.el9_6, kernel-64k 5.14.0-570.131.1.el9_6, kernel-core 5.14.0-570.131.1.el9_6, kernel-tools 5.14.0-570.131.1.el9_6, kernel-modules 5.14.0-570.131.1.el9_6, kernel-64k-core 5.14.0-570.131.1.el9_6, +27 more
    fixed: vendor fix RHSA-2026:49031
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.201.1.el8_4, kernel 4.18.0-305.201.1.el8_4, bpftool 4.18.0-305.201.1.el8_4, kernel-core 4.18.0-305.201.1.el8_4, kernel-tools 4.18.0-305.201.1.el8_4, python3-perf 4.18.0-305.201.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:59091
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) perf 4.18.0-372.214.1.el8_6, kernel 4.18.0-372.214.1.el8_6, bpftool 4.18.0-372.214.1.el8_6, kernel-core 4.18.0-372.214.1.el8_6, kernel-tools 4.18.0-372.214.1.el8_6, python3-perf 4.18.0-372.214.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:68131
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.156.1.el8_8, kernel 4.18.0-477.156.1.el8_8, bpftool 4.18.0-477.156.1.el8_8, kernel-core 4.18.0-477.156.1.el8_8, kernel-tools 4.18.0-477.156.1.el8_8, python3-perf 4.18.0-477.156.1.el8_8, +8 more
    fixed: vendor fix RHSA-2026:47869
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.94.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.94.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.94.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.94.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.94.1.el10_0
    fixed: vendor fix RHSA-2026:49030
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.186.1.rt14.471.el9_2, kernel-rt-core 5.14.0-284.186.1.rt14.471.el9_2, kernel-rt-modules 5.14.0-284.186.1.rt14.471.el9_2, kernel-rt-debug-core 5.14.0-284.186.1.rt14.471.el9_2, kernel-rt-modules-core 5.14.0-284.186.1.rt14.471.el9_2, kernel-rt-debug-modules 5.14.0-284.186.1.rt14.471.el9_2, +4 more
    fixed: vendor fix RHSA-2026:51604
  • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt 5.14.0-427.141.1.el9_4, kernel-rt-core 5.14.0-427.141.1.el9_4, kernel-rt-modules 5.14.0-427.141.1.el9_4, kernel-rt-debug-core 5.14.0-427.141.1.el9_4, kernel-rt-modules-core 5.14.0-427.141.1.el9_4, kernel-rt-debug-modules 5.14.0-427.141.1.el9_4, +4 more
    fixed: vendor fix RHSA-2026:48386
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.94.1.el10_0, kernel-rt-64k 6.12.0-55.94.1.el10_0, kernel-rt-core 6.12.0-55.94.1.el10_0, kernel-rt-modules 6.12.0-55.94.1.el10_0, kernel-rt-64k-core 6.12.0-55.94.1.el10_0, kernel-rt-debug-core 6.12.0-55.94.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:49030
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.131.1.el9_6, kernel-rt-64k 5.14.0-570.131.1.el9_6, kernel-rt-core 5.14.0-570.131.1.el9_6, kernel-rt-modules 5.14.0-570.131.1.el9_6, kernel-rt-64k-core 5.14.0-570.131.1.el9_6, kernel-rt-debug-core 5.14.0-570.131.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:49031
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.186.1.rt14.471.el9_2, kernel-rt-kvm 5.14.0-284.186.1.rt14.471.el9_2, kernel-rt-core 5.14.0-284.186.1.rt14.471.el9_2, kernel-rt-modules 5.14.0-284.186.1.rt14.471.el9_2, kernel-rt-debug-kvm 5.14.0-284.186.1.rt14.471.el9_2, kernel-rt-debug-core 5.14.0-284.186.1.rt14.471.el9_2, +6 more
    fixed: vendor fix RHSA-2026:51604
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt 5.14.0-427.141.1.el9_4, kernel-rt-kvm 5.14.0-427.141.1.el9_4, kernel-rt-core 5.14.0-427.141.1.el9_4, kernel-rt-modules 5.14.0-427.141.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.141.1.el9_4, kernel-rt-debug-core 5.14.0-427.141.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:48386
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.94.1.el10_0, kernel-rt-kvm 6.12.0-55.94.1.el10_0, kernel-rt-core 6.12.0-55.94.1.el10_0, kernel-rt-modules 6.12.0-55.94.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.94.1.el10_0, kernel-rt-debug-core 6.12.0-55.94.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:49030
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.131.1.el9_6, kernel-rt-kvm 5.14.0-570.131.1.el9_6, kernel-rt-core 5.14.0-570.131.1.el9_6, kernel-rt-modules 5.14.0-570.131.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.131.1.el9_6, kernel-rt-debug-core 5.14.0-570.131.1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:49031
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernel Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    +1 more products
    Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
23 d ago

Exploit prediction

0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.