CVE-2026-64375

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().