CVE-2026-80996

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux33f72e6f0c67f673fd0c63a8182dbd9ffb8cf50b < 0fe037d5eaad938aa3e9143ee071aa237750b42baffected
LinuxLinux33f72e6f0c67f673fd0c63a8182dbd9ffb8cf50b < 9c340473f4822bb31b151c19afd17448eda5acd1affected
LinuxLinux33f72e6f0c67f673fd0c63a8182dbd9ffb8cf50b < 50c4038f1670bf9a80c6a58ae83d1602decd8481affected
LinuxLinux33f72e6f0c67f673fd0c63a8182dbd9ffb8cf50b < af20e269f7459d2ce69887fdf2fad7caf986c865affected
LinuxLinux4.0affected
LinuxLinux0 < 4.0unaffected
LinuxLinux6.12.109 <= 6.12.*unaffected
LinuxLinux6.18.50 <= 6.18.*unaffected
LinuxLinux7.2.4 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References