CVE-2026-64375proc: protect ptrace_may_access() with exec_update_lock (FD links)
- 7.8HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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().
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 4 months later
· 4 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 778c1144771f0064b6f51bee865cceb0d996f2f9 – < 6253dfee5afba536bb54fc6fe6c091c3758fafe1
- affected 778c1144771f0064b6f51bee865cceb0d996f2f9 – < 65bf0d2b6e914f1448d6a2fde193dcf60936a651
- affected 778c1144771f0064b6f51bee865cceb0d996f2f9 – < de497d7aa2fae453a7e7c8f7d3e8682e565e3aaf
- affected 778c1144771f0064b6f51bee865cceb0d996f2f9 – < 138c692d2b2d63d26f2eb957d0e4fcc5d61f9ff2
- affected 778c1144771f0064b6f51bee865cceb0d996f2f9 – < 83b17872e3166c295c599279fc9562ac3840c638
- affected 778c1144771f0064b6f51bee865cceb0d996f2f9 – < 497c6bae5167428596575f20af6613ff5671f383
- affected 778c1144771f0064b6f51bee865cceb0d996f2f9 – < dfd1894cb64cbd8758b461ed713800fe73db4f82
- affected 778c1144771f0064b6f51bee865cceb0d996f2f9 – < 6255da28d4bb5349fe18e84cb043ccd394eba75d
- affected 2.6.18
- unaffected < 2.6.18
- unaffected 5.10.261 – ≤ 5.10.*
- unaffected 5.15.212 – ≤ 5.15.*
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.97 – ≤ 6.12.*
- unaffected 6.18.40 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References10
- https://git.kernel.org/stable/c/6253dfee5afba536bb54fc6fe6c091c3758fafe1 (opens in a new tab)
- https://git.kernel.org/stable/c/65bf0d2b6e914f1448d6a2fde193dcf60936a651 (opens in a new tab)
- https://git.kernel.org/stable/c/de497d7aa2fae453a7e7c8f7d3e8682e565e3aaf (opens in a new tab)
- https://git.kernel.org/stable/c/138c692d2b2d63d26f2eb957d0e4fcc5d61f9ff2 (opens in a new tab)
- https://git.kernel.org/stable/c/83b17872e3166c295c599279fc9562ac3840c638 (opens in a new tab)
- https://git.kernel.org/stable/c/497c6bae5167428596575f20af6613ff5671f383 (opens in a new tab)
- https://git.kernel.org/stable/c/dfd1894cb64cbd8758b461ed713800fe73db4f82 (opens in a new tab)
- https://git.kernel.org/stable/c/6255da28d4bb5349fe18e84cb043ccd394eba75d (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-48919 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64375)Record last updated .