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Review reviewHigh

CVE-2026-64375

Linux

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_l...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

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_l...

Affected product and versions

Product
Linux
Affected versions
>= 778c1144771f0064b6f51bee865cceb0d996f2f9 < 6253dfee5afba536bb54fc6fe6c091c3758fafe1, >= 778c1144771f0064b6f51bee865cceb0d996f2f9 < 65bf0d2b6e914f1448d6a2fde193dcf60936a651, >= 778c1144771f0064b6f51bee865cceb0d996f2f9 < de497d7aa2fae453a7e7c8f7d3e8682e565e3aaf, >= 778c1144771f0064b6f51bee865cceb0d996f2f9 < 138c692d2b2d63d26f2eb957d0e4fcc5d61f9ff2, >= 778c1144771f0064b6f51bee865cceb0d996f2f9 < 83b17872e3166c295c599279fc9562ac3840c638, >= 778c1144771f0064b6f51bee865cceb0d996f2f9 < 497c6bae5167428596575f20af6613ff5671f383, >= 778c1144771f0064b6f51bee865cceb0d996f2f9 < dfd1894cb64cbd8758b461ed713800fe73db4f82, >= 778c1144771f0064b6f51bee865cceb0d996f2f9 < 6255da28d4bb5349fe18e84cb043ccd394eba75d, >= 2.6.18
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available