Critical severity9.8NVD Advisory· Published Jul 25, 2026· Updated Oct 21, 2026
CVE-2026-64391
CVE-2026-64391
Description
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.
Affected products
4- osv-coords2 versions
>= 5.15.0, < 6.6.160+ 1 more
- (no CPE)range: >= 5.15.0, < 6.6.160
- (no CPE)range: < 7.1.7-1.1
Patches
Vulnerability mechanics
References
5- git.kernel.org/stable/c/2b4592cea214683de0f2ce6f8c22c097fb0ea1abnvdPatch
- git.kernel.org/stable/c/52a56cf53ec834c44ac1b4d16d585f26613ee5cenvdPatch
- git.kernel.org/stable/c/a8f5d39971bbad9340d49cd41b0e2da9452a649dnvdPatch
- git.kernel.org/stable/c/baa5e094886fffa7e6272edcb5e08be5ce28262cnvdPatch
- git.kernel.org/stable/c/2ad5509dd576ae16d252d4698daf03002f9e0234nvd
News mentions
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