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Fencer Intel
high 7.8

CVE-2026-64375 json

proc: protect ptrace_may_access() with exec_update_lock (FD links)

published 3mo ago modified yesterday also EUVD-2026-48919

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

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

proc: protect ptrace_may_access() with exec_update_lock (FD links)

proc_pid_get_link() and proc_pid_readlink() currently look up the task from the pid once, then do the ptrace access check on that task, then look up the task from the pid a second time to do the actual access. That's racy in several ways.

To fix it, pass the task to the ->proc_get_link() handler, and instead of proc_fd_access_allowed(), introduce a new helper call_proc_get_link() that looks up and locks the task, does the access check, and calls ->proc_get_link().

Patch / fix

  • Linux Linux 7.2
  • linux Debian 12 6.1.180-1
  • 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-2026-64375

  • 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 7.0.0-31.31
  • 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 7.0.0-1012.12
  • 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-2026-64375

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 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
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.53.81.1
  • kernel-source SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 6.4.0-150700.53.81.1
  • kernel-default SLE Workstation Extension 15 SP7, SLE Module for Legacy 15 SP7, SLE Module for Basesystem 15 SP7 +2 more 6.4.0-150700.53.81.1
  • kernel-zfcpdump SLE Module for Basesystem 15 SP7 6.4.0-150700.53.81.1
  • kernel-obs-build SLE Module for Development Tools 15 SP7 6.4.0-150700.53.81.1
  • kernel-default-base SLE Module for Basesystem 15 SP7 6.4.0-150700.53.81.1.150700.17.45.1

suse advisories SUSE-SU-2026:4687-1SUSE-SU-2026:4254-1SUSE-SU-2026:23887-1SUSE-SU-2026:23902-1SUSE-SU-2026:23897-1SUSE-SU-2026:23881-1

  • 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 6.6.145.2-1

azure linux advisories AZL-93935

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

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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-2026-64375 updated cvss 7.0

kernel: proc: protect ptrace_may_access() with exec_update_lock (FD links)

  • 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 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 Enterprise Linux AppStream (v. 9) rv 5.14.0-741.14.1.el9_9, perf 5.14.0-741.14.1.el9_9, rtla 5.14.0-741.14.1.el9_9, python3-perf 5.14.0-741.14.1.el9_9, kernel-devel-matched 5.14.0-741.14.1.el9_9, kernel-64k-devel-matched 5.14.0-741.14.1.el9_9, +7 more
    fixed: vendor fix RHSA-2026:97435
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-264.9.1.el10_3, perf 6.12.0-264.9.1.el10_3, rtla 6.12.0-264.9.1.el10_3, python3-perf 6.12.0-264.9.1.el10_3, kernel-devel-matched 6.12.0-264.9.1.el10_3, kernel-64k-devel-matched 6.12.0-264.9.1.el10_3, +7 more
    fixed: vendor fix RHSA-2026:97040
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-741.14.1.el9_9, kernel-64k 5.14.0-741.14.1.el9_9, kernel-core 5.14.0-741.14.1.el9_9, kernel-tools 5.14.0-741.14.1.el9_9, kernel-modules 5.14.0-741.14.1.el9_9, kernel-64k-core 5.14.0-741.14.1.el9_9, +27 more
    fixed: vendor fix RHSA-2026:97435
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-264.9.1.el10_3, kernel-64k 6.12.0-264.9.1.el10_3, kernel-core 6.12.0-264.9.1.el10_3, kernel-tools 6.12.0-264.9.1.el10_3, kernel-modules 6.12.0-264.9.1.el10_3, kernel-64k-core 6.12.0-264.9.1.el10_3, +28 more
    fixed: vendor fix RHSA-2026:97040
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-741.14.1.el9_9, kernel-debuginfo-common-s390x 5.14.0-741.14.1.el9_9, kernel-debuginfo-common-x86_64 5.14.0-741.14.1.el9_9, kernel-debuginfo-common-aarch64 5.14.0-741.14.1.el9_9, kernel-debuginfo-common-ppc64le 5.14.0-741.14.1.el9_9
    fixed: vendor fix RHSA-2026:97435
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-264.9.1.el10_3, kernel-debuginfo-common-s390x 6.12.0-264.9.1.el10_3, kernel-debuginfo-common-x86_64 6.12.0-264.9.1.el10_3, kernel-debuginfo-common-aarch64 6.12.0-264.9.1.el10_3, kernel-debuginfo-common-ppc64le 6.12.0-264.9.1.el10_3
    fixed: vendor fix RHSA-2026:97040
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-741.14.1.el9_9, kernel-rt-64k 5.14.0-741.14.1.el9_9, kernel-rt-core 5.14.0-741.14.1.el9_9, kernel-rt-modules 5.14.0-741.14.1.el9_9, kernel-rt-64k-core 5.14.0-741.14.1.el9_9, kernel-rt-debug-core 5.14.0-741.14.1.el9_9, +14 more
    fixed: vendor fix RHSA-2026:97435
show 3 more
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-264.9.1.el10_3, kernel-rt-64k 6.12.0-264.9.1.el10_3, kernel-rt-core 6.12.0-264.9.1.el10_3, kernel-rt-modules 6.12.0-264.9.1.el10_3, kernel-rt-64k-core 6.12.0-264.9.1.el10_3, kernel-rt-debug-core 6.12.0-264.9.1.el10_3, +14 more
    fixed: vendor fix RHSA-2026:97040
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-741.14.1.el9_9, kernel-rt-core 5.14.0-741.14.1.el9_9, kernel-rt-modules 5.14.0-741.14.1.el9_9, kernel-rt-debug-core 5.14.0-741.14.1.el9_9, kernel-rt-modules-core 5.14.0-741.14.1.el9_9, kernel-rt-debug-modules 5.14.0-741.14.1.el9_9, +5 more
    fixed: vendor fix RHSA-2026:97435
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-264.9.1.el10_3, kernel-rt-core 6.12.0-264.9.1.el10_3, kernel-rt-modules 6.12.0-264.9.1.el10_3, kernel-rt-debug-core 6.12.0-264.9.1.el10_3, kernel-rt-modules-core 6.12.0-264.9.1.el10_3, kernel-rt-debug-modules 6.12.0-264.9.1.el10_3, +5 more
    fixed: vendor fix RHSA-2026:97040

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 ICSA-26-295-11 updated cvss 7.8

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.7 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.7 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.7 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.7 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.7
    affected: mitigation, no fix available

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
26d ago

Exploit prediction

0.11% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
Technology feeds

References

Sources

Fencer Intel 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.