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.
Fix
Patch, vendor advisory and mitigation references on NVD 4
- https://git.kernel.org/stable/c/2b4592cea214683de0f2ce6f8c22c097fb0ea1ab Patch
- https://git.kernel.org/stable/c/52a56cf53ec834c44ac1b4d16d585f26613ee5ce Patch
- https://git.kernel.org/stable/c/a8f5d39971bbad9340d49cd41b0e2da9452a649d Patch
- https://git.kernel.org/stable/c/baa5e094886fffa7e6272edcb5e08be5ce28262c Patch
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 3
- Cpes+1 CPE criteria (now 1)NVD modified 2026-10-21 13:19
- StatusPublished → ModifiedNVD modified 2026-10-21 13:19
- First seenCVSS 9.8 · linuxNVD modified 2026-10-21 12:43
Affected (CPE criteria) 1
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
References 5
- https://git.kernel.org/stable/c/2ad5509dd576ae16d252d4698daf03002f9e0234
- https://git.kernel.org/stable/c/2b4592cea214683de0f2ce6f8c22c097fb0ea1ab Patch
- https://git.kernel.org/stable/c/52a56cf53ec834c44ac1b4d16d585f26613ee5ce Patch
- https://git.kernel.org/stable/c/a8f5d39971bbad9340d49cd41b0e2da9452a649d Patch
- https://git.kernel.org/stable/c/baa5e094886fffa7e6272edcb5e08be5ce28262c Patch