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

What is CVE-2026-64111?

CVE-2026-64111 is a high-severity vulnerability in Linux kernel, published on 19 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

lsm: hold cred_guard_mutex for lsm_set_self_attr()

Just as proc_pid_attr_write() 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 allow the transition.

Which versions are affected by CVE-2026-64111?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-64111?

Apply the vendor's patch.

Is CVE-2026-64111 being exploited?

There is no known exploitation of CVE-2026-64111 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-64111, DEBIAN-CVE-2026-64111, GHSA-rf37-4wvf-8h47, ROOT-OS-UBUNTU-2204-CVE-2026-64111, UBUNTU-CVE-2026-64111.