🛡️ CVE-2025-40279 on Debian — linux

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

In the Linux kernel, the following vulnerability has been resolved: net: sched: act_connmark: initialize struct tc_ife to fix kernel leak In tcf_connmark_dump(), the variable 'opt' was partially initialized using a designatied initializer. While the padding bytes are reamined uninitialized. nla_put() copies the entire structure into a netlink message, these uninitialized bytes leaked to userspace. Initialize the structure with memset before assigning its fields to ensure all members and padding are cleared prior to beign copied.

Distribution advisory

This page covers CVE-2025-40279 as tracked by Debian, for the package linux. The fix is available in version 6.17.9-1; earlier versions remain affected.

Affected software

DEBIAN-CVE-2025-40279 is recorded against 2 packages.

  • linux (fixed in 6.17.9-1)
  • linux-6.1 (fixed in 6.1.159-1~deb11u1)

Timeline and source

Published on 6 December 2025 and last revised on 4 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security-tracker.debian.org (Advisory)

CVE-2025-40279 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2025-12-06
Updated 2026-08-12
Modified 2026-08-04
Fix URL N/A

Affected Packages

Software From version Fixed in
linux — 6.17.9-1
linux-6.1 — 6.1.159-1~deb11u1

Similar Threats

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