CVE-2026-23139 (GCVE-0-2026-23139)

Vulnerability from cvelistv5 – Published: 2026-02-14 15:22 – Updated: 2026-05-11 22:00
VLAI
Title
netfilter: nf_conncount: update last_gc only when GC has been performed
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f106694733c66a48740c25bc4e212e9b2ea364ce , < 2c7c71113ed6d3e2f3aca4c088f22283016ff34f (git)
Affected: be69850b461e7b491d87a22e33ab76fdd04b725e , < c4cde57c8affdcca5bcff53a1047e15d268bdca1 (git)
Affected: d265929930e2ffafc744c0ae05fb70acd53be1ee , < 9f45588993d7f115280fc726119ca86fba32a811 (git)
Affected: d265929930e2ffafc744c0ae05fb70acd53be1ee , < 3cd717359e56f82f06cbf8279b47a7d79880c6f3 (git)
Affected: d265929930e2ffafc744c0ae05fb70acd53be1ee , < 26a82dce2beee39c43c109d9647e16f49cb02a35 (git)
Affected: d265929930e2ffafc744c0ae05fb70acd53be1ee , < 8bdafdf4900040a81422056cabe5e00a37bd101a (git)
Affected: d265929930e2ffafc744c0ae05fb70acd53be1ee , < 7811ba452402d58628e68faedf38745b3d485e3c (git)
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Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.1.161 , ≤ 6.1.* (semver)
Unaffected: 6.6.121 , ≤ 6.6.* (semver)
Unaffected: 6.12.66 , ≤ 6.12.* (semver)
Unaffected: 6.18.6 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.