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TI-2025-26358 Aliases CVE-2025-39682GHSA-v2pf-75pf-9c5h

tls: fix handling of zero-length records on the rx_list

Priority CRITICAL 100Exploited in the wildCWE-754Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

In the Linux kernel, the following vulnerability has been resolved: tls: fix handling of zero-length records on the rx_list Each recvmsg() call must process either - only contiguous DATA records (any number of them) - one non-DATA record If the next record has different type than what has already been processed we break out of the main processing loop. If the record has already been decrypted (which may be the case for TLS 1.3 where we don't know type until decryption) we queue the pending record to the rx_list. Next recvmsg() will pick it up from there. Queuing the skb to rx_list after zero-copy decrypt is not possible, since in that case we decrypted directly to the user space buffer, and we don't have an skb to queue (darg.skb points to the ciphertext skb for access to metadata like length). Only data records are allowed zero-copy, and we break the processing loop after each non-data record. So we should never zero-copy and then find out that the record type has changed. The corner case we missed is when the initial record comes from rx_list, and it's zero length.

Why it matters now

Exploitation Active In CISA KEV since 2026-09-18CISA due date 2026-09-21
EPSS 0.03198 88th percentileScored 2026-11-07
Fix Fixed Linux (Linux): 6.1.149, 6.6.103, 6.12.44 +2Red Hat: 5 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Active
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux6.0 and later6.1.149, 6.6.103, 6.12.44, 6.16.4, 6.17Patch availableCNA
  • Linux VendorLinux Affected 6.0 and later Fixed in 6.1.149, 6.6.103, 6.12.44, 6.16.4, 6.17 Patch available CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*6.0 to before 6.1.149; 6.2 to before 6.6.103; 6.7 to before 6.12.44; 6.13 to before 6.16.4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*6.17 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*6.17 rc2VulnerableLinux
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*11.0VulnerableDebian
cpe:2.3:o:siemens:simatic_cn_4100_firmware:*:*:*:*:*:*:*:*before 5.0VulnerableSiemens
cpe:2.3:h:siemens:simatic_cn_4100:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.0 to before 6.1.149; 6.2 to before 6.6.103; 6.7 to before 6.12.44; 6.13 to before 6.16.4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:* Versions 6.17 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:* Versions 6.17 rc2 Vulnerable ·Linux
  • cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
  • cpe:2.3:o:siemens:simatic_cn_4100_firmware:*:*:*:*:*:*:*:* Versions before 5.0 Vulnerable ·Siemens
  • cpe:2.3:h:siemens:simatic_cn_4100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.1.149, 6.6.103, 6.12.44, 6.16.4, 6.17

Red Hat 5 advisories

  • RHSA-2025:19224 Released 2025-10-29 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.144.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.144.1.el9_2, kernel-64k-devel-5.14.0-284.144.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.144.1.el9_2, kernel-5.14.0-284.144.1.el9_2, kernel-64k-5.14.0-284.144.1.el9_2 +29
  • RHSA-2025:19223 Released 2025-10-29 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.144.1.rt14.429.el9_2, kernel-rt-core-5.14.0-284.144.1.rt14.429.el9_2, kernel-rt-debug-5.14.0-284.144.1.rt14.429.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.144.1.rt14.429.el9_2, kernel-rt-core-5.14.0-284.144.1.rt14.429.el9_2, kernel-rt-debug-5.14.0-284.144.1.rt14.429.el9_2 +11
  • RHSA-2025:19104 Released 2025-10-27 · Red Hat rating Moderate
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) kernel-tools-libs-devel-5.14.0-427.96.1.el9_4, libperf-5.14.0-427.96.1.el9_4
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) kernel-64k-debug-devel-5.14.0-427.96.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.96.1.el9_4, kernel-64k-devel-5.14.0-427.96.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool-7.3.0-427.96.1.el9_4, kernel-5.14.0-427.96.1.el9_4, kernel-64k-5.14.0-427.96.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt-5.14.0-427.96.1.el9_4, kernel-rt-core-5.14.0-427.96.1.el9_4, kernel-rt-debug-5.14.0-427.96.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt-5.14.0-427.96.1.el9_4, kernel-rt-core-5.14.0-427.96.1.el9_4, kernel-rt-debug-5.14.0-427.96.1.el9_4 +11
Show 2 more Red Hat advisories
  • RHSA-2025:16904 Released 2025-09-29 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-55.37.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.37.1.el10_0, kernel-64k-devel-6.12.0-55.37.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-55.37.1.el10_0, kernel-64k-6.12.0-55.37.1.el10_0, kernel-64k-core-6.12.0-55.37.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-55.37.1.el10_0, libperf-6.12.0-55.37.1.el10_0
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-55.37.1.el10_0, kernel-rt-64k-6.12.0-55.37.1.el10_0, kernel-rt-64k-core-6.12.0-55.37.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-55.37.1.el10_0, kernel-rt-core-6.12.0-55.37.1.el10_0, kernel-rt-debug-6.12.0-55.37.1.el10_0 +11
  • RHSA-2025:16880 Released 2025-09-29 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-570.49.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.49.1.el9_6, kernel-64k-devel-5.14.0-570.49.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-570.49.1.el9_6, kernel-64k-5.14.0-570.49.1.el9_6, kernel-64k-core-5.14.0-570.49.1.el9_6 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-570.49.1.el9_6, libperf-5.14.0-570.49.1.el9_6
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-570.49.1.el9_6, kernel-rt-64k-5.14.0-570.49.1.el9_6, kernel-rt-64k-core-5.14.0-570.49.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-570.49.1.el9_6, kernel-rt-core-5.14.0-570.49.1.el9_6, kernel-rt-debug-5.14.0-570.49.1.el9_6 +11

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat CodeReady Linux Builder EUS (v.9.4)Fixed RHSA-2025:19104
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2025:16904
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2025:16880
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2025:19224
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2025:19104
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2025:16904
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2025:16880
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2025:19224
Red Hat Enterprise Linux BaseOS EUS (v.9.4)Fixed RHSA-2025:19104
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2025:16904
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2025:16880
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2025:16904
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2025:16880
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2025:19223
Red Hat Enterprise Linux Real Time EUS (v.9.4)Fixed RHSA-2025:19104
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2025:16904
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2025:16880
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)Fixed RHSA-2025:19223
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4)Fixed RHSA-2025:19104
Not affected: 3 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8

Timeline

  1. 2026-09-18 Added to CISA KEV
  2. 2026-10-02 Threatist record created from CVE-2025-39682
  3. 2026-10-03 Alias added: GHSA-v2pf-75pf-9c5h
  4. 2026-10-07 CISA SSVC decision points changed

References

Patch 5

Advisory 2

  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
  • TI-2023-00252 Use after free in SNDRV_CTL_IOCTL_ELEM in Linux Kernel KEVCVSS 3.1HIGH 7.9
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences