Medium [CVE-2026-80996] Linux kernel: L2TP: Resource exhaustion via multicast notification errors
This medium-severity Red Hat Linux advisory covers CVE-2026-80996.
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Summary
A flaw was found in the Linux kernel's L2TP (Layer 2 Tunneling Protocol) networking component. Specifically, the netlink handlers responsible for creating and modifying L2TP tunnels and sessions may fail to propagate multicast notification errors.
This can lead to calling applications retrying operations that have already successfully completed, potentially causing an accumulation of live objects. Such an accumulation could result in resource exhaustion, leading to a denial of service.
Red Hat severity: Moderate — CVSS 4.4 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-770.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 43 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 43 minutes ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 43 minutes ago·verify at source
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