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().
Affected products
linux: linux kernel
References10
- git.kernel.org/stable/c/138c692d2b2d63d26f2eb957d0e4fcc5d61f9ff2 Patch
- git.kernel.org/stable/c/497c6bae5167428596575f20af6613ff5671f383 Patch
- git.kernel.org/stable/c/6253dfee5afba536bb54fc6fe6c091c3758fafe1 Patch
- git.kernel.org/stable/c/6255da28d4bb5349fe18e84cb043ccd394eba75d Patch
- git.kernel.org/stable/c/65bf0d2b6e914f1448d6a2fde193dcf60936a651 Patch
- git.kernel.org/stable/c/83b17872e3166c295c599279fc9562ac3840c638 Patch
- git.kernel.org/stable/c/de497d7aa2fae453a7e7c8f7d3e8682e565e3aaf Patch
- git.kernel.org/stable/c/dfd1894cb64cbd8758b461ed713800fe73db4f82 Patch
- cert-portal.siemens.com/productcert/html/ssa-019113.html Third Party Advisory
- cert-portal.siemens.com/productcert/html/ssa-457936.html
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 3 · as of 14 November 2026
- CWE
- CWE-362
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