Search: CVE-2026-43109

A vulnerability in the Linux kernel x86 shadow stacks implementation was resolved, addressing improper error handling in the mmap lock mechanism. Specifically, the function shstk_pop_sigframe() failed to check for errors from mmap_read_lock_killable(), which was an oversight. This issue has been fixed along with marking the relevant functions with __must_check to prevent similar mistakes. The vulnerability affects specific versions of the linux-hwe-edge kernel and has a CVSS score of 5.5 with high severity due to potential availability impact. A patch is available as part of the Ubuntu security updates.