CVE-2026-64392ksmbd: use opener credentials for delete-on-close
- 9.1CriticalCVSS base score
- 0.51%Exploitation in 30 daysEPSS · top 56% 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: ksmbd: use opener credentials for delete-on-close Delete-on-close can be completed by deferred or durable handle teardown, where no request work is available. Both the base-file unlink and the ADS xattr removal consequently run with the ksmbd worker credentials and can bypass filesystem permission checks. Run both operations with the credentials captured in struct file when the handle was opened. This preserves the authenticated user's fsuid, fsgid, supplementary groups and capability restrictions at final close.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 3 months later
· 3 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 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H |
| NVDNVD · Modified | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.51% · top 56% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.1.
Affected products
- affected f44158485826c076335d6860d35872271a83791d – < 3cb2e6e2a6798909507b9d695e4b80e685e72d26
- affected f44158485826c076335d6860d35872271a83791d – < f08b3f451f12eee4abd8a5981803bc36db84458b
- affected f44158485826c076335d6860d35872271a83791d – < 18c59109bb6fb816d5102171666f87cf1e29901d
- affected f44158485826c076335d6860d35872271a83791d – < e72c15085b6d86f45d224d98aa75b5cace4aaab9
- affected f44158485826c076335d6860d35872271a83791d – < 4b7059974549d278e30fe70e2a4e421f9839817d
- affected f44158485826c076335d6860d35872271a83791d – < 52e2f21911158ec961cd5aae19c56460db382af0
- affected 5.15
- unaffected < 5.15
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.96 – ≤ 6.12.*
- unaffected 6.18.39 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References6
- https://git.kernel.org/stable/c/3cb2e6e2a6798909507b9d695e4b80e685e72d26 (opens in a new tab)
- https://git.kernel.org/stable/c/f08b3f451f12eee4abd8a5981803bc36db84458b (opens in a new tab)
- https://git.kernel.org/stable/c/18c59109bb6fb816d5102171666f87cf1e29901d (opens in a new tab)
- https://git.kernel.org/stable/c/e72c15085b6d86f45d224d98aa75b5cace4aaab9 (opens in a new tab)
- https://git.kernel.org/stable/c/4b7059974549d278e30fe70e2a4e421f9839817d (opens in a new tab)
- https://git.kernel.org/stable/c/52e2f21911158ec961cd5aae19c56460db382af0 (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-2026-48936 (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-2026-64392)Record last updated .