CVE-2026-53243

A flaw was found in the Linux kernel. An uninitialized stack variable in the rseq_exit_user_update() function can lead to an information leak. This occurs due to an indeterminate sequencing of expressions during the initialization of the rseq_ids structure, where ids.node_id is assigned using an uninitialized ids.cpu_id. A local attacker could potentially exploit this to gain sensitive kernel information.