CVE-2026-89603

A flaw was found in the Linux kernel. A race condition exists where a seccomp filter, intended to restrict system calls, can be bypassed by an unprivileged process. This occurs when a thread is stopped for tracing (ptrace) and another thread attempts to apply a seccomp filter with the SECCOMP_FILTER_FLAG_TSYNC flag. Due to a caching issue, the newly installed filter is not properly enforced, allowing the unprivileged process to execute system calls that should have been blocked, potentially leading to a security bypass.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.