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CVE

CVE-2026-64391

ksmbd: use opener credentials for ADS I/O
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CVE

CVE-2026-64391

ksmbd: use opener credentials for ADS I/O

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: use opener credentials for ADS I/O

Alternate data streams are stored as xattrs. Unlike regular file I/O,

their read and write paths therefore call VFS xattr helpers which recheck

inode permissions and LSM policy using the current task credentials.

Run ADS I/O with the credentials captured when the SMB handle was opened.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://git.kernel.org/stable/c/2b4592cea214683de0f2ce6f8c22c097fb0ea1ab, https://git.kernel.org/stable/c/52a56cf53ec834c44ac1b4d16d585f26613ee5ce, https://git.kernel.org/stable/c/a8f5d39971bbad9340d49cd41b0e2da9452a649d, https://git.kernel.org/stable/c/baa5e094886fffa7e6272edcb5e08be5ce28262c, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64391.json, https://nvd.nist.gov/vuln/detail/CVE-2026-64391, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.00457%
EPSS Percentile
0.38455%
Introduced Version
f44158485826c076335d6860d35872271a83791d,5.15.0,6.13.0,6.19.0,0
Fix Available
baa5e094886fffa7e6272edcb5e08be5ce28262c,6.12.96,6.18.39,7.1.4,6.12.100-1~deb12u1,6.12.96-1,7.0.0-1012.12~24.04.1,7.0.0-1011.11~24.04.1,7.0.0-31.31~24.04.1,7.0.0-31.31.1~24.04.1

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