CVE-2026-64391

critical · 9.8

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.

9.8

CVSS

0.5%

EPSS (exploit prob.)

39th

EPSS percentile

2026-07-25

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Vendor	Product	Affected versions
linux	linux_kernel	>= 5.15, < 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/2b4592cea214683de0f2ce6f8c22c097fb0ea1ab
https://git.kernel.org/stable/c/52a56cf53ec834c44ac1b4d16d585f26613ee5ce
https://git.kernel.org/stable/c/a8f5d39971bbad9340d49cd41b0e2da9452a649d
https://git.kernel.org/stable/c/baa5e094886fffa7e6272edcb5e08be5ce28262c

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-64391