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Fencer Vulns
critical 9.8

CVE-2025-38471 in the critical feed json

tls: always refresh the queue when reading sock

published 2025-07-28 15 mo ago modified 2026-10-15 25 d ago also EUVD-2025-22891

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

Summary

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

tls: always refresh the queue when reading sock

After recent changes in net-next TCP compacts skbs much more aggressively. This unearthed a bug in TLS where we may try to operate on an old skb when checking if all skbs in the queue have matching decrypt state and geometry.

BUG: KASAN: slab-use-after-free in tls_strp_check_rcv+0x898/0x9a0 [tls] (net/tls/tls_strp.c:436 net/tls/tls_strp.c:530 net/tls/tls_strp.c:544) Read of size 4 at addr ffff888013085750 by task tls/13529

CPU: 2 UID: 0 PID: 13529 Comm: tls Not tainted 6.16.0-rc5-virtme Call Trace: kasan_report+0xca/0x100 tls_strp_check_rcv+0x898/0x9a0 [tls] tls_rx_rec_wait+0x2c9/0x8d0 [tls] tls_sw_recvmsg+0x40f/0x1aa0 [tls] inet_recvmsg+0x1c3/0x1f0

Always reload the queue, fast path is to have the record in the queue when we wake, anyway (IOW the path going down "if !strp->stm.full_len").

Patch / fix

  • Linux Linux 6.1, 6.1.147, 6.6.100, 6.12.40, 6.15.8, 6.16
  • linux Debian 12 6.1.147-1
  • linux Debian 13 6.12.41-1
  • linux Debian 14 6.16.3-1

debian advisories DEBIAN-CVE-2025-38471

  • linux Ubuntu 24.04 LTS 6.8.0-100.100
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1046.49
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1047.50
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1043.48
  • linux-ibm Ubuntu 24.04 LTS 6.8.0-1044.44
  • linux-azure Ubuntu 24.04 LTS 6.8.0-1046.52
  • linux-gkeop Ubuntu 24.04 LTS 6.8.0-1030.33
  • linux-raspi Ubuntu 24.04 LTS 6.8.0-1047.51

ubuntu advisories UBUNTU-CVE-2025-38471

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

  • kpatch-patch-5_14_0-570_17_1 RHEL 9 1-6.el9_6
  • kernel RHEL 10.0 6.12.0-55.28.1.el10_0
  • rv RHEL 10.0 6.12.0-55.28.1.el10_0
  • perf RHEL 10.0 6.12.0-55.28.1.el10_0
  • rtla RHEL 10.0 6.12.0-55.28.1.el10_0
  • libperf RHEL 10.0 6.12.0-55.28.1.el10_0
  • kernel-rt RHEL 10.0 6.12.0-55.28.1.el10_0
  • kernel-64k RHEL 10.0 6.12.0-55.28.1.el10_0

red hat advisories RHSA-2025:14811RHSA-2025:14599RHSA-2025:14497RHSA-2025:14082RHSA-2025:14009RHSA-2025:14003

  • kernel-livepatch-MICRO-6-0-RT_Update_3 Linux Micro 6.0 14-1.2
  • kernel-livepatch-MICRO-6-0-RT_Update_2 Linux Micro 6.1, Linux Micro 6.0 14-1.1
  • kernel-livepatch-MICRO-6-0_Update_2 Linux Micro 6.1, Linux Micro 6.0 14-1.1
  • kernel-livepatch-MICRO-6-0_Update_4 Linux Micro 6.1, Linux Micro 6.0 12-1.2
  • kernel-livepatch-MICRO-6-0_Update_6 Linux Micro 6.1, Linux Micro 6.0 8-3.1
  • kernel-livepatch-MICRO-6-0_Update_9 Linux Micro 6.1, Linux Micro 6.0 7-1.2
  • kernel-livepatch-MICRO-6-0_Update_8 Linux Micro 6.1, Linux Micro 6.0 7-1.2
  • kernel-livepatch-MICRO-6-0_Update_5 Linux Micro 6.1, Linux Micro 6.0 10-1.2

suse advisories SUSE-SU-2025:20891-1SUSE-SU-2025:20890-1SUSE-SU-2025:20920-1SUSE-SU-2025:20886-1SUSE-SU-2025:20909-1SUSE-SU-2025:20885-1

  • kernel AlmaLinux 9 5.14.0-570.35.1.el9_6
  • rv AlmaLinux 9 5.14.0-570.35.1.el9_6
  • perf AlmaLinux 9 5.14.0-570.35.1.el9_6
  • rtla AlmaLinux 9 5.14.0-570.35.1.el9_6
  • libperf AlmaLinux 9 5.14.0-570.35.1.el9_6
  • kernel-rt AlmaLinux 9 5.14.0-570.35.1.el9_6
  • kernel-64k AlmaLinux 9 5.14.0-570.35.1.el9_6
  • kernel-core AlmaLinux 9 5.14.0-570.35.1.el9_6

almalinux advisories ALSA-2025:13962ALSA-2025:14009

  • kernel Azure Linux 3.0 6.6.104.2-1

azure linux advisories AZL-65949

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-2025-38471 updated cvss 7.4

kernel: tls: always refresh the queue when reading sock

  • 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 “To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.”
  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.84.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.84.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.84.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.84.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.84.1.el9_4
    fixed: vendor fix “To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:14082
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-570.35.1.el9_6, perf 5.14.0-570.35.1.el9_6, rtla 5.14.0-570.35.1.el9_6, python3-perf 5.14.0-570.35.1.el9_6, kernel-devel-matched 5.14.0-570.35.1.el9_6, kernel-64k-devel-matched 5.14.0-570.35.1.el9_6, +7 more
    fixed: vendor fix “To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:13962
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-55.28.1.el10_0, perf 6.12.0-55.28.1.el10_0, rtla 6.12.0-55.28.1.el10_0, python3-perf 6.12.0-55.28.1.el10_0, kernel-devel-matched 6.12.0-55.28.1.el10_0, kernel-64k-devel-matched 6.12.0-55.28.1.el10_0, +7 more
    fixed: vendor fix “To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:14009
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.131.1.el9_2, rtla 5.14.0-284.131.1.el9_2, kernel-devel-matched 5.14.0-284.131.1.el9_2, kernel-64k-devel-matched 5.14.0-284.131.1.el9_2, kernel-debug-devel-matched 5.14.0-284.131.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.131.1.el9_2, +5 more
    fixed: vendor fix “To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:14003
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.84.1.el9_4, perf 5.14.0-427.84.1.el9_4, rtla 5.14.0-427.84.1.el9_4, kernel-devel-matched 5.14.0-427.84.1.el9_4, kernel-64k-devel-matched 5.14.0-427.84.1.el9_4, kernel-debug-devel-matched 5.14.0-427.84.1.el9_4, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:14082
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-570.35.1.el9_6, kernel-64k 5.14.0-570.35.1.el9_6, kernel-core 5.14.0-570.35.1.el9_6, kernel-tools 5.14.0-570.35.1.el9_6, kernel-modules 5.14.0-570.35.1.el9_6, kernel-64k-core 5.14.0-570.35.1.el9_6, +28 more
    fixed: vendor fix “To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:13962
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-55.28.1.el10_0, kernel-64k 6.12.0-55.28.1.el10_0, kernel-core 6.12.0-55.28.1.el10_0, kernel-tools 6.12.0-55.28.1.el10_0, kernel-modules 6.12.0-55.28.1.el10_0, kernel-64k-core 6.12.0-55.28.1.el10_0, +27 more
    fixed: vendor fix “To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:14009
show 13 more
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.131.1.el9_2, kernel 5.14.0-284.131.1.el9_2, kernel-64k 5.14.0-284.131.1.el9_2, kernel-core 5.14.0-284.131.1.el9_2, kernel-tools 5.14.0-284.131.1.el9_2, python3-perf 5.14.0-284.131.1.el9_2, +33 more
    fixed: vendor fix “To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:14003
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.84.1.el9_4, kernel 5.14.0-427.84.1.el9_4, kernel-64k 5.14.0-427.84.1.el9_4, kernel-core 5.14.0-427.84.1.el9_4, kernel-tools 5.14.0-427.84.1.el9_4, python3-perf 5.14.0-427.84.1.el9_4, +33 more
    fixed: vendor fix “To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:14082
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-570.35.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.35.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.35.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.35.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.35.1.el9_6
    fixed: vendor fix “To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:13962
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-55.28.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.28.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.28.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.28.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.28.1.el10_0
    fixed: vendor fix “To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:14009
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-570.35.1.el9_6, kernel-rt-64k 5.14.0-570.35.1.el9_6, kernel-rt-core 5.14.0-570.35.1.el9_6, kernel-rt-modules 5.14.0-570.35.1.el9_6, kernel-rt-64k-core 5.14.0-570.35.1.el9_6, kernel-rt-debug-core 5.14.0-570.35.1.el9_6, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:13962
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-55.28.1.el10_0, kernel-rt-64k 6.12.0-55.28.1.el10_0, kernel-rt-core 6.12.0-55.28.1.el10_0, kernel-rt-modules 6.12.0-55.28.1.el10_0, kernel-rt-64k-core 6.12.0-55.28.1.el10_0, kernel-rt-debug-core 6.12.0-55.28.1.el10_0, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:14009
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.131.1.rt14.416.el9_2, kernel-rt-core 5.14.0-284.131.1.rt14.416.el9_2, kernel-rt-modules 5.14.0-284.131.1.rt14.416.el9_2, kernel-rt-debug-core 5.14.0-284.131.1.rt14.416.el9_2, kernel-rt-modules-core 5.14.0-284.131.1.rt14.416.el9_2, kernel-rt-debug-modules 5.14.0-284.131.1.rt14.416.el9_2, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:14005
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.84.1.el9_4, kernel-rt-core 5.14.0-427.84.1.el9_4, kernel-rt-modules 5.14.0-427.84.1.el9_4, kernel-rt-debug-core 5.14.0-427.84.1.el9_4, kernel-rt-modules-core 5.14.0-427.84.1.el9_4, kernel-rt-debug-modules 5.14.0-427.84.1.el9_4, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:14082
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-570.35.1.el9_6, kernel-rt-kvm 5.14.0-570.35.1.el9_6, kernel-rt-core 5.14.0-570.35.1.el9_6, kernel-rt-modules 5.14.0-570.35.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.35.1.el9_6, kernel-rt-debug-core 5.14.0-570.35.1.el9_6, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:13962
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-55.28.1.el10_0, kernel-rt-kvm 6.12.0-55.28.1.el10_0, kernel-rt-core 6.12.0-55.28.1.el10_0, kernel-rt-modules 6.12.0-55.28.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.28.1.el10_0, kernel-rt-debug-core 6.12.0-55.28.1.el10_0, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:14009
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.131.1.rt14.416.el9_2, kernel-rt-kvm 5.14.0-284.131.1.rt14.416.el9_2, kernel-rt-core 5.14.0-284.131.1.rt14.416.el9_2, kernel-rt-modules 5.14.0-284.131.1.rt14.416.el9_2, kernel-rt-debug-kvm 5.14.0-284.131.1.rt14.416.el9_2, kernel-rt-debug-core 5.14.0-284.131.1.rt14.416.el9_2, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:14005
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt 5.14.0-427.84.1.el9_4, kernel-rt-kvm 5.14.0-427.84.1.el9_4, kernel-rt-core 5.14.0-427.84.1.el9_4, kernel-rt-modules 5.14.0-427.84.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.84.1.el9_4, kernel-rt-debug-core 5.14.0-427.84.1.el9_4, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:14082
  • 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
    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 ICSA-25-162-05 updated cvss 7.8

Siemens SIMATIC S7-1500 CPU family

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.5
    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

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 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
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

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.