CVE-2026-64371 proc: protect ptrace_may_access() with exec_update_lock (part 1)

What is CVE-2026-64371?

CVE-2026-64371 is a medium-severity vulnerability in Linux kernel, published on 25 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:

proc: protect ptrace_may_access() with exec_update_lock (part 1)

Fix the easy cases where procfs currently calls ptrace_may_access() without exec_update_lock protection, where the fix is to simply add the extra lock or use mm_access():

- do_task_stat(): grab exec_update_lock - proc_pid_wchan(): grab exec_update_lock - proc_map_files_lookup(): use mm_access() instead of get_task_mm() - proc_map_files_readdir(): use mm_access() instead of get_task_mm() - proc_ns_get_link(): grab exec_update_lock - proc_ns_readlink(): grab exec_update_lock

Which versions are affected by CVE-2026-64371?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-64371?

Apply the vendor's patch.

Is CVE-2026-64371 being exploited?

There is no known exploitation of CVE-2026-64371 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 AZL-93840, BELL-CVE-2026-64371, DEBIAN-CVE-2026-64371, GHSA-mx48-2qjx-49h9, ROOT-OS-UBUNTU-2204-CVE-2026-64371, UBUNTU-CVE-2026-64371.