Riskcovery

CVE-2026-64392

ksmbd: use opener credentials for delete-on-close

State
Published
Severity
9.1 Critical
Published
Jul 25, 2026
Updated
Oct 30, 2026
Reserved
Jul 19, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.19.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • f44158485826c076335d6860d35872271a83791d to before 3cb2e6e2a6798909507b9d695e4b80e685e72d26Affected
  • f44158485826c076335d6860d35872271a83791d to before f08b3f451f12eee4abd8a5981803bc36db84458bAffected
  • f44158485826c076335d6860d35872271a83791d to before 18c59109bb6fb816d5102171666f87cf1e29901dAffected
  • f44158485826c076335d6860d35872271a83791d to before e72c15085b6d86f45d224d98aa75b5cace4aaab9Affected
  • f44158485826c076335d6860d35872271a83791d to before 4b7059974549d278e30fe70e2a4e421f9839817dAffected
  • f44158485826c076335d6860d35872271a83791d to before 52e2f21911158ec961cd5aae19c56460db382af0Affected
LinuxLinux
  • 5.15Affected
  • before 5.15Not affected
  • 6.1.191 through 6.1.*Not affected
  • 6.6.145 through 6.6.*Not affected
  • 6.12.96 through 6.12.*Not affected
  • 6.18.39 through 6.18.*Not affected
  • 7.1.4 through 7.1.*Not affected
  • 7.2 and laterNot affected

References

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