CVE-2026-23139
HIGHCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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3Description
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.
Analysis
The Linux kernel netfilter connection tracking module fails to properly manage garbage collection timing, allowing an attacker with local access to bypass cleanup operations and cause unbounded memory consumption on affected systems. By maintaining a sufficiently high packet rate, an attacker can prevent the garbage collector from executing, causing the connection tracking list to grow indefinitely and potentially lead to denial of service. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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