CVE-2026-64111 lsm: hold cred_guard_mutex for lsm_set_self_attr()

In the Linux kernel, the following vulnerability has been resolved: lsm: hold credguardmutex for lsmsetselfattr Just as procpidattrwrite already does before calling the LSM hook. This only matters for SELinux and AppArmor which check whether the process is being ptraced and if so, whether to allo...