CVE-2026-23139: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.3% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conncount: update last_gc only when GC has been performed Currently last_gc is being updated everytime a new connection is tracked, that means that it is updated even if a GC wasn't performed. With a sufficiently high packet rate, it is possible to always bypass the GC, causing the list to grow infinitely. Update the last_gc value only when a GC has been actually performed.

Affected products

• Linux Linux Kernel: from 5.19, before 6.1.161 (fixed in 6.1.161); from 6.2, before 6.6.121 (fixed in 6.6.121); from 6.7, before 6.12.66 (fixed in 6.12.66); from 6.13, before 6.18.6 (fixed in 6.18.6); version 6.19 only

Published 2026-02-14. Last modified 2026-06-17.