CVE-2026-43109

A flaw was found in the Linux kernel's x86 shadow stacks implementation. An oversight in the shstk_pop_sigframe() function's error handling for mmap_read_lock_killable() could lead to unexpected behavior. This vulnerability involves improper error checking during memory management operations.

Red Hat acknowledges the upstream Linux kernel correction for «x86» as described in COMMENT_ZERO. Fixes are delivered through standard kernel errata for supported products. Operational exposure depends on whether this subsystem or driver is active in your configuration.

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.