CVE-2026-46099

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A use-after-free issue exists in the Linux kernel network subsystem. The functions seg6 input core() and rpl input() call ip6 route input(), which assigns a NOREF destination (dst) to the socket buffer (skb). This destination is then passed to dst cache set ip6(), which invokes dst hold() unconditionally. On systems using PREEMPT RT, a race condition can occur where a higher-priority task releases the underlying pcpu rt via a concurrent FIB lookup on a shared nexthop between the initial lookup and the caching process. This results in dst hold() being called on a dead destination, leading to a system warning or a use-after-free scenario.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.