Critical 9.1Published Jul 25, 2026

CVE-2026-64393ksmbd: run set info with opener credentials

Updated under an hour ago (Oct 27, 2026, 3:50 AM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: ksmbd: run set info with opener credentials SMB2 SET_INFO handlers call path-based VFS helpers after checking the access mask granted to the SMB handle. Those helpers perform their owner, inode permission and LSM checks using the current ksmbd worker credentials. Run the complete SET_INFO dispatch with the credentials captured when the handle was opened. This also removes the separate security information credential setup and keeps all SET_INFO classes under one credential scope. Direct override_creds() is used because it can nest with the request credential overrides already used by rename and link helpers.

CVSS: 9.1 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Aug 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 5cbabf3a71575cd31bc7785d92d4ab42338a654b; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before b35afd5cf8fab236ef21117e42ee45691d4ffa7b; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 0ce682867fd506f61f40c76bde7e4205bde34e87; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 20ee516a62989a8d505ee432f9e59525ea23984e; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 8cc9ec711f5255167247a9ab6a7179b787426ed7; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before b383bcad3d2fe634b26efbce53e22bbb5753a520	CNA record
linux linux_kernel linux:linux_kernel	from 5.15 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.96; from 6.13 before 6.18.39; from 6.19 before 7.1.4	NVD

References

References

https://git.kernel.org/stable/c/5cbabf3a71575cd31bc7785d92d4ab42338a654b	patch
https://git.kernel.org/stable/c/b35afd5cf8fab236ef21117e42ee45691d4ffa7b	patch
https://git.kernel.org/stable/c/0ce682867fd506f61f40c76bde7e4205bde34e87	patch
https://git.kernel.org/stable/c/20ee516a62989a8d505ee432f9e59525ea23984e	patch
https://git.kernel.org/stable/c/8cc9ec711f5255167247a9ab6a7179b787426ed7	patch
https://git.kernel.org/stable/c/b383bcad3d2fe634b26efbce53e22bbb5753a520	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.