CVE-2026-46063

A flaw was found in the Linux kernel. A deadlock can occur during the shadow stack signal return (shstk sigreturn) process on x86 systems. This happens when the kernel attempts to read the shadow stack signal frame, and a page fault occurs, leading to a recursive attempt to acquire an mmap read lock. If another CPU is waiting to write, this can result in a system deadlock, causing a denial of service.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.