CVE-2026-23139
netfilter: nf_conncount: update last_gc only when GC has been performed
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.
INFO
Published Date :
Feb. 14, 2026, 4:15 p.m.
Last Modified :
Feb. 14, 2026, 4:15 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-23139
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Apply the netfilter patch to the Linux kernel.
- Ensure last_gc is updated only after garbage collection.
- Monitor system stability under high packet rates.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-23139.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-23139 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-23139
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-23139 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-23139 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Feb. 14, 2026
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/26a82dce2beee39c43c109d9647e16f49cb02a35 Added Reference https://git.kernel.org/stable/c/2c7c71113ed6d3e2f3aca4c088f22283016ff34f Added Reference https://git.kernel.org/stable/c/3cd717359e56f82f06cbf8279b47a7d79880c6f3 Added Reference https://git.kernel.org/stable/c/7811ba452402d58628e68faedf38745b3d485e3c Added Reference https://git.kernel.org/stable/c/8bdafdf4900040a81422056cabe5e00a37bd101a Added Reference https://git.kernel.org/stable/c/9f45588993d7f115280fc726119ca86fba32a811 Added Reference https://git.kernel.org/stable/c/c4cde57c8affdcca5bcff53a1047e15d268bdca1