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
linux: linux kernel
References6
- git.kernel.org/stable/c/2b4592cea214683de0f2ce6f8c22c097fb0ea1ab Patch
- git.kernel.org/stable/c/52a56cf53ec834c44ac1b4d16d585f26613ee5ce Patch
- git.kernel.org/stable/c/a8f5d39971bbad9340d49cd41b0e2da9452a649d Patch
- git.kernel.org/stable/c/baa5e094886fffa7e6272edcb5e08be5ce28262c Patch
- git.kernel.org/stable/c/222c4c52c3af2d0f68de31182710df3508a31095
- git.kernel.org/stable/c/2ad5509dd576ae16d252d4698daf03002f9e0234
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 43 · as of 14 November 2026
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.