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Fencer Vulns
no cvss —

CVE-2026-64507 json

x86/bugs: Enable IBPB flush on BPF JIT allocation

published 2026-07-25 3 mo ago modified 2026-11-06 2 d ago also EUVD-2026-48851

cvss
—
not scored
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits
0
none known

Summary

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

x86/bugs: Enable IBPB flush on BPF JIT allocation

Enable hardening against JIT spraying when Spectre-v2 mitigations are in use. Specifically, issue an IBPB flush on BPF JIT memory reuse. Skip enabling the IBPB flush if the BPF dispatcher is already using a retpoline sequence.

This hardening applies only when BPF-JIT is in use. Guard the enabling under CONFIG_BPF_JIT so that bugs.c still builds with CONFIG_BPF_JIT=n.

Patch / fix

  • Linux Linux 6.1.183, 6.6.145, 6.12.97, 6.18.39, 7.1.4, 7.2
  • linux Debian 12 6.1.187-1
  • linux Debian 13 6.12.100-1
  • linux Debian 14 7.1.4-1
  • linux-6.12 Debian 12 6.12.100-1~deb12u1

debian advisories DEBIAN-CVE-2026-64507

  • linux Ubuntu 24.04 LTS 6.8.0-147.147
  • linux Ubuntu 26.04 LTS 7.0.0-31.31
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1067.70
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1012.12
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1071.79
  • linux-gcp Ubuntu 26.04 LTS 7.0.0-1011.11
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1066.74
  • linux-gke Ubuntu 26.04 LTS 7.0.0-1006.7

ubuntu advisories UBUNTU-CVE-2026-64507

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 RHEL 9 5.14.0-687.57.1.el9_8
  • rv RHEL 9 5.14.0-687.57.1.el9_8
  • perf RHEL 9 5.14.0-687.57.1.el9_8
  • rtla RHEL 9 5.14.0-687.57.1.el9_8
  • libperf RHEL 9 5.14.0-687.57.1.el9_8
  • kernel-rt RHEL 9 5.14.0-687.57.1.el9_8
  • kernel-64k RHEL 9 5.14.0-687.57.1.el9_8
  • kernel-core RHEL 9 5.14.0-687.57.1.el9_8

red hat advisories RHSA-2026:81552RHSA-2026:81406

  • kernel-source Linux Micro 6.0 6.4.0-159998.55.1
  • kernel-default Linux Micro 6.0 6.4.0-159998.55.1
  • kernel-kvmsmall Linux Micro 6.0 6.4.0-159998.55.1
  • kernel-default-base Linux Micro 6.0 6.4.0-159998.55.1.159998.21.42
  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.90.1
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.90.1
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.53.90.1
  • kernel-source SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 6.4.0-150700.53.90.1

suse advisories SUSE-SU-2026:24550-1SUSE-SU-2026:5091-1SUSE-SU-2026:4706-1SUSE-SU-2026:4640-1SUSE-SU-2026:24316-1SUSE-SU-2026:24315-1

  • 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 AlmaLinux 10 6.12.0-211.65.1.el10_2
  • rv AlmaLinux 10 6.12.0-211.65.1.el10_2
  • perf AlmaLinux 10 6.12.0-211.65.1.el10_2
  • rtla AlmaLinux 10 6.12.0-211.65.1.el10_2
  • libperf AlmaLinux 10 6.12.0-211.65.1.el10_2
  • kernel-rt AlmaLinux 10 6.12.0-211.65.1.el10_2
  • kernel-64k AlmaLinux 10 6.12.0-211.65.1.el10_2
  • kernel-core AlmaLinux 10 6.12.0-211.65.1.el10_2

almalinux advisories ALSA-2026:81406ALSA-2026:81552

  • kernel Rocky Linux 10 6.12.0-211.65.1.el10_2
  • kernel Rocky Linux 9 5.14.0-687.57.1.el9_8

rocky linux advisories RLSA-2026:81406RLSA-2026:81552

  • kernel Azure Linux 3.0 6.6.145.2-1

azure linux advisories AZL-93809

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-2026-64507 updated cvss 6.0

kernel: x86/bugs: Enable IBPB flush on BPF JIT allocation

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 kernel-rt, kernel-rt-kvm, kernel-rt-trace, kernel-rt-debug-kvm, kernel-rt-trace-kvm Red Hat Enterprise Linux 8 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +6 more Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.151.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.151.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.151.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.151.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.151.1.el9_6
    fixed: vendor fix RHSA-2026:89890
  • Red Hat Enterprise Linux kernel-modules-internal 6.12.0-211.65.1.el10_2
    fixed: vendor fix RHSA-2026:81406
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.57.1.el9_8, perf 5.14.0-687.57.1.el9_8, rtla 5.14.0-687.57.1.el9_8, python3-perf 5.14.0-687.57.1.el9_8, kernel-devel-matched 5.14.0-687.57.1.el9_8, kernel-64k-devel-matched 5.14.0-687.57.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:81552
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.65.1.el10_2, perf 6.12.0-211.65.1.el10_2, rtla 6.12.0-211.65.1.el10_2, python3-perf 6.12.0-211.65.1.el10_2, kernel-devel-matched 6.12.0-211.65.1.el10_2, kernel-64k-devel-matched 6.12.0-211.65.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:81406
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.114.1.el10_0, perf 6.12.0-55.114.1.el10_0, rtla 6.12.0-55.114.1.el10_0, python3-perf 6.12.0-55.114.1.el10_0, kernel-devel-matched 6.12.0-55.114.1.el10_0, kernel-64k-devel-matched 6.12.0-55.114.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:91648
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.151.1.el9_6, perf 5.14.0-570.151.1.el9_6, rtla 5.14.0-570.151.1.el9_6, python3-perf 5.14.0-570.151.1.el9_6, kernel-devel-matched 5.14.0-570.151.1.el9_6, kernel-64k-devel-matched 5.14.0-570.151.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:89890
show 17 more
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.57.1.el9_8, kernel-64k 5.14.0-687.57.1.el9_8, kernel-core 5.14.0-687.57.1.el9_8, kernel-tools 5.14.0-687.57.1.el9_8, kernel-modules 5.14.0-687.57.1.el9_8, kernel-64k-core 5.14.0-687.57.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:81552
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.65.1.el10_2, kernel-64k 6.12.0-211.65.1.el10_2, kernel-core 6.12.0-211.65.1.el10_2, kernel-tools 6.12.0-211.65.1.el10_2, kernel-modules 6.12.0-211.65.1.el10_2, kernel-64k-core 6.12.0-211.65.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:81406
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.114.1.el10_0, kernel-64k 6.12.0-55.114.1.el10_0, kernel-core 6.12.0-55.114.1.el10_0, kernel-tools 6.12.0-55.114.1.el10_0, kernel-modules 6.12.0-55.114.1.el10_0, kernel-64k-core 6.12.0-55.114.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:91648
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.151.1.el9_6, kernel-64k 5.14.0-570.151.1.el9_6, kernel-core 5.14.0-570.151.1.el9_6, kernel-tools 5.14.0-570.151.1.el9_6, kernel-modules 5.14.0-570.151.1.el9_6, kernel-64k-core 5.14.0-570.151.1.el9_6, +27 more
    fixed: vendor fix RHSA-2026:89890
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.57.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.57.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.57.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.57.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.57.1.el9_8
    fixed: vendor fix RHSA-2026:81552
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.65.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.65.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.65.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.65.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.65.1.el10_2
    fixed: vendor fix RHSA-2026:81406
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.114.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.114.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.114.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.114.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.114.1.el10_0
    fixed: vendor fix RHSA-2026:91648
  • Red Hat Enterprise Linux Hidden (v. 10) kernel-modules-internal 6.12.0-211.65.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.65.1.el10_2
    fixed: vendor fix RHSA-2026:81406
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.57.1.el9_8, kernel-rt-64k 5.14.0-687.57.1.el9_8, kernel-rt-core 5.14.0-687.57.1.el9_8, kernel-rt-modules 5.14.0-687.57.1.el9_8, kernel-rt-64k-core 5.14.0-687.57.1.el9_8, kernel-rt-debug-core 5.14.0-687.57.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:81552
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.65.1.el10_2, kernel-rt-64k 6.12.0-211.65.1.el10_2, kernel-rt-core 6.12.0-211.65.1.el10_2, kernel-rt-modules 6.12.0-211.65.1.el10_2, kernel-rt-64k-core 6.12.0-211.65.1.el10_2, kernel-rt-debug-core 6.12.0-211.65.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:81406
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.114.1.el10_0, kernel-rt-64k 6.12.0-55.114.1.el10_0, kernel-rt-core 6.12.0-55.114.1.el10_0, kernel-rt-modules 6.12.0-55.114.1.el10_0, kernel-rt-64k-core 6.12.0-55.114.1.el10_0, kernel-rt-debug-core 6.12.0-55.114.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:91648
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.151.1.el9_6, kernel-rt-64k 5.14.0-570.151.1.el9_6, kernel-rt-core 5.14.0-570.151.1.el9_6, kernel-rt-modules 5.14.0-570.151.1.el9_6, kernel-rt-64k-core 5.14.0-570.151.1.el9_6, kernel-rt-debug-core 5.14.0-570.151.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:89890
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.57.1.el9_8, kernel-rt-core 5.14.0-687.57.1.el9_8, kernel-rt-modules 5.14.0-687.57.1.el9_8, kernel-rt-debug-core 5.14.0-687.57.1.el9_8, kernel-rt-modules-core 5.14.0-687.57.1.el9_8, kernel-rt-debug-modules 5.14.0-687.57.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:81552
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.65.1.el10_2, kernel-rt-core 6.12.0-211.65.1.el10_2, kernel-rt-modules 6.12.0-211.65.1.el10_2, kernel-rt-debug-core 6.12.0-211.65.1.el10_2, kernel-rt-modules-core 6.12.0-211.65.1.el10_2, kernel-rt-debug-modules 6.12.0-211.65.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:81406
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.114.1.el10_0, kernel-rt-kvm 6.12.0-55.114.1.el10_0, kernel-rt-core 6.12.0-55.114.1.el10_0, kernel-rt-modules 6.12.0-55.114.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.114.1.el10_0, kernel-rt-debug-core 6.12.0-55.114.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:91648
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.151.1.el9_6, kernel-rt-kvm 5.14.0-570.151.1.el9_6, kernel-rt-core 5.14.0-570.151.1.el9_6, kernel-rt-modules 5.14.0-570.151.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.151.1.el9_6, kernel-rt-debug-core 5.14.0-570.151.1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:89890
  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, python-perf, kernel-kdump, kernel-tools, +3 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-core, kernel-tools, python3-perf, +17 more
    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
partial
Assessed
2 d ago

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).

Affected products

  • Linux Linux

Classification

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.