cve 2026 22977

CVE-2026-22977 is a Linux kernel vulnerability that causes a hardened-usercopy panic in the sock_recv_errqueue function, leading to a deterministic kernel crash when specific TCP socket operations interact with error-queue reads. This is not a remote code execution flaw but an availability issue affecting systems with usercopy hardening enabled. The fix has been merged into upstream stable trees, and major distributions are preparing backports. System administrators and kernel packagers should prioritize applying the patch to prevent system crashes.