Bug 2439874 (CVE-2026-23139) - CVE-2026-23139 kernel: netfilter: nf_conncount: update last_gc only when GC has been performed
Summary: CVE-2026-23139 kernel: netfilter: nf_conncount: update last_gc only when GC h...
Keywords:
Status: NEW
Alias: CVE-2026-23139
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-02-14 16:02 UTC by OSIDB Bzimport
Modified: 2026-05-11 00:29 UTC (History)
0 users

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:15883 0 None None None 2026-05-11 00:29:53 UTC

Description OSIDB Bzimport 2026-02-14 16:02:49 UTC 
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.
Comment 1 Alexander B 2026-02-16 13:27:19 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026021429-CVE-2026-23139-a7b4@gregkh/T
Comment 5 errata-xmlrpc 2026-05-11 00:29:52 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:15883 https://access.redhat.com/errata/RHSA-2026:15883
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