CVE-2026-64375

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().

References

• https://git.kernel.org/stable/c/138c692d2b2d63d26f2eb957d0e4fcc5d61f9ff2
• https://git.kernel.org/stable/c/497c6bae5167428596575f20af6613ff5671f383
• https://git.kernel.org/stable/c/6253dfee5afba536bb54fc6fe6c091c3758fafe1
• https://git.kernel.org/stable/c/6255da28d4bb5349fe18e84cb043ccd394eba75d
• https://git.kernel.org/stable/c/65bf0d2b6e914f1448d6a2fde193dcf60936a651