CVE-2026-31786

The CVE-2026-31786 issue affects the Linux kernel in drivers/xen/sys-hypervisor.c, where HYPERVISOR_xen_version(XENVER_build_id) returned a build_id that is not NUL-terminated, causing a buffer overflow via sprintf in buildid_show. The root cause is that the build_id was not treated as a proper s...