CVE-2026-80996
In the Linux kernel, the following vulnerability has been resolved: net: l2tp: do not propagate multicast notification errors The tunnel create, tunnel modify, session create, and session modify netlink handlers send multicast notifications through helpers that can fail while allocating or encoding a message, or while multicasting it. For tunnel and session create/modify, a notification is sent after the live operation has completed. Returning a best-effort notification error as the command result can therefore report failure for an operation that already committed and can cause callers to retry and accumulate live objects. Keep sending notifications for listener visibility, but do not propagate their best-effort status as the command result. This also keeps the tunnel modify command consistent with the other notification-only paths.
Affected versions
Linux kernel versions
4.0
and later are affected. Fixed in
6.12.109,
6.18.50,
7.2.4,
7.3-rc1
and their respective stable series.
References
4 totalFrequently asked questions
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What is CVE-2026-80996?
CVE-2026-80996 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.0 onward and has been patched in 6.12.109, 6.18.50, 7.2.4 and others. CVE-2026-80996 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-80996?
Yes. CVE-2026-80996 has been patched. Fixed versions include 6.12.109, 6.18.50, 7.2.4 and others. If you are running Linux kernel 4.0 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-80996 actively exploited?
No. CVE-2026-80996 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.