CVE-2026-52946

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

Description A deadlock can occur in the send sigio() and send sigurg() functions when a process group receives a signal. This happens because these functions use read lock(&tasklist lock) to traverse the task list while being called from a softirq context. The deadlock is triggered by the rwlock writer fairness mechanism: if one CPU holds a read lock and another CPU attempts to acquire a write lock (blocking new readers), a subsequent softirq on the first CPU attempting to acquire the read lock will result in a deadlock. This issue could potentially be exploited as a remote denial of service vector via TCP URG packets.

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