CVE-2026-64392
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.47%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
- EPSS
- 0.47% probability · 39th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/18c59109bb6fb816d5102171666f87cf1e29901dPatch
- https://git.kernel.org/stable/c/4b7059974549d278e30fe70e2a4e421f9839817dPatch
- https://git.kernel.org/stable/c/52e2f21911158ec961cd5aae19c56460db382af0Patch
- https://git.kernel.org/stable/c/e72c15085b6d86f45d224d98aa75b5cace4aaab9Patch
- https://git.kernel.org/stable/c/f08b3f451f12eee4abd8a5981803bc36db84458bPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.