CVE-2026-23139

netfilter: nf_conncount: update last_gc only when GC has been performed

State: Published
Severity: 7.5 High
Published: Feb 14, 2026
Updated: Aug 5, 2026
Reserved: Jan 13, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	f106694733c66a48740c25bc4e212e9b2ea364ce to before 2c7c71113ed6d3e2f3aca4c088f22283016ff34fAffected be69850b461e7b491d87a22e33ab76fdd04b725e to before c4cde57c8affdcca5bcff53a1047e15d268bdca1Affected d265929930e2ffafc744c0ae05fb70acd53be1ee to before 9f45588993d7f115280fc726119ca86fba32a811Affected d265929930e2ffafc744c0ae05fb70acd53be1ee to before 3cd717359e56f82f06cbf8279b47a7d79880c6f3Affected d265929930e2ffafc744c0ae05fb70acd53be1ee to before 26a82dce2beee39c43c109d9647e16f49cb02a35Affected d265929930e2ffafc744c0ae05fb70acd53be1ee to before 8bdafdf4900040a81422056cabe5e00a37bd101aAffected d265929930e2ffafc744c0ae05fb70acd53be1ee to before 7811ba452402d58628e68faedf38745b3d485e3cAffected
LinuxLinux	5.19Affected before 5.19Not affected 6.1.161 through 6.1.Not affected 6.6.121 through 6.6.Not affected 6.12.66 through 6.12.Not affected 6.18.6 through 6.18.Not affected 6.19 and laterNot affected

Product

Versions

LinuxLinux

f106694733c66a48740c25bc4e212e9b2ea364ce to before 2c7c71113ed6d3e2f3aca4c088f22283016ff34fAffected
be69850b461e7b491d87a22e33ab76fdd04b725e to before c4cde57c8affdcca5bcff53a1047e15d268bdca1Affected
d265929930e2ffafc744c0ae05fb70acd53be1ee to before 9f45588993d7f115280fc726119ca86fba32a811Affected
d265929930e2ffafc744c0ae05fb70acd53be1ee to before 3cd717359e56f82f06cbf8279b47a7d79880c6f3Affected
d265929930e2ffafc744c0ae05fb70acd53be1ee to before 26a82dce2beee39c43c109d9647e16f49cb02a35Affected
d265929930e2ffafc744c0ae05fb70acd53be1ee to before 8bdafdf4900040a81422056cabe5e00a37bd101aAffected
d265929930e2ffafc744c0ae05fb70acd53be1ee to before 7811ba452402d58628e68faedf38745b3d485e3cAffected

LinuxLinux

5.19Affected
before 5.19Not affected
6.1.161 through 6.1.*Not affected
6.6.121 through 6.6.*Not affected
6.12.66 through 6.12.*Not affected
6.18.6 through 6.18.*Not affected
6.19 and laterNot affected

References

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