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CVE-2026-64508 json

bpf: Support for hardening against JIT spraying

published 2026-07-25 3 mo ago modified 2026-11-06 2 d ago also EUVD-2026-48852

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 8%
public exploits
0
none known

Summary

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

bpf: Support for hardening against JIT spraying

The BPF JIT allocator packs many small programs into larger executable allocations and reuses space within those allocations as programs are loaded and freed. When fresh code is written into space that a previous program occupied, an indirect jump into the new program can reuse a branch prediction left behind by the old one.

Flush the indirect branch predictors before reusing JIT memory so that indirect jumps into a newly written program don't reuse predictions from an old program that occupied the same space.

Introduce bpf_arch_pred_flush_enabled static key and bpf_arch_pred_flush static call for flushing the branch predictors on JIT memory reuse. Architectures that need a flush, can update it to a predictor flush function. By default, its a NOP and does not emit any CALL.

Allocations larger than a pack are not covered by this flush. That is safe because cBPF programs (the unprivileged attack surface) are bounded well below a pack size. Issue a warning if this assumption is ever violated while the flush is active.

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-2026-64508

  • 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-2026-64508

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-2026:5091-1

  • kernel-source openSUSE Tumbleweed 7.1.7-1.1

opensuse advisories openSUSE-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-93857

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-2026-64508 updated cvss 6.7

kernel: bpf: Support for hardening against JIT spraying

  • 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
  • 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
show 16 more
  • 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 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more 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

0.19% chance of exploitation in the next 30 days, higher than 8% 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.