CVE-2026-64375 proc: protect ptrace_may_access() with exec_update_lock (FD links)
A race condition in Linux kernel proc filesystem allows bypassing ptrace access checks during file descriptor link resolution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64375?
CVE-2026-64375 is a high-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 (FD links)
proc_pid_get_link() and proc_pid_readlink() currently look up the task from the pid once, then do the ptrace access check on that task, then look up the task from the pid a second time to do the actual access. That's racy in several ways.
To fix it, pass the task to the ->proc_get_link() handler, and instead of proc_fd_access_allowed(), introduce a new helper call_proc_get_link() that looks up and locks the task, does the access check, and calls ->proc_get_link().
Weakness: CWE-362
Which versions are affected by CVE-2026-64375?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64375?
Apply the vendor's patch.
Is CVE-2026-64375 being exploited?
There is no known exploitation of CVE-2026-64375 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-93935, BELL-CVE-2026-64375, DEBIAN-CVE-2026-64375, GHSA-4h3q-cf72-r99p, ROOT-OS-DEBIAN-12-CVE-2026-64375, ROOT-OS-DEBIAN-13-CVE-2026-64375 and 2 more.