CVE-2026-64392
critical · 9.1In 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.
9.1
CVSS
0.5%
EPSS (exploit prob.)
40th
EPSS percentile
2026-07-25
Published
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| linux | linux_kernel | >= 5.15, < 6.6.145 |
| linux | linux_kernel | >= 6.7, < 6.12.96 |
| linux | linux_kernel | >= 6.13, < 6.18.39 |
| linux | linux_kernel | >= 6.19, < 7.1.4 |
Check a specific version with /api/v1/cve/match.
References
- https://git.kernel.org/stable/c/18c59109bb6fb816d5102171666f87cf1e29901d
- https://git.kernel.org/stable/c/4b7059974549d278e30fe70e2a4e421f9839817d
- https://git.kernel.org/stable/c/52e2f21911158ec961cd5aae19c56460db382af0
- https://git.kernel.org/stable/c/e72c15085b6d86f45d224d98aa75b5cace4aaab9
- https://git.kernel.org/stable/c/f08b3f451f12eee4abd8a5981803bc36db84458b
Query this programmatically:
curl https://evil-db.io/api/v1/cve/CVE-2026-64392