CVE-2026-74662
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel inet_frag_create(), the fragment queue timer is armed before the queue is published in the hash table. If the fragment timeout is zero or negative, the timer can run before publication, causing a race and leaving a stale hash node.
Risk Assessment
This vulnerability could lead to use-after-free or system crash, potentially enabling a denial of service.
Recommendation
Install the kernel patch that publishes the queue before arming the timer and holds the lock while arming.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: inet: frags: publish queues before arming timer inet_frag_create() arms the fragment queue timer before inserting the queue into the fqdir rhashtable. If the namespace fragment timeout is zero or negative, the timer can run before the queue is published. The timer callback then marks the queue complete, tries to remove a node that is not in the hash table yet, and drops the anticipated hash reference. Creation can subsequently publish the completed queue without restoring that reference, leaving a stale hash node after the caller drops the remaining reference. Publish the queue first and arm the timer while holding the queue lock. This makes timer expiry wait until the queue is visible in the hash table, so inet_frag_kill() can remove the node and balance the hash reference.