PT-2026-64612 · Linux · Linux

CVE-2026-64391 · Published 2026-07-25 · Updated 2026-07-25

NVD

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.

Related Identifiers

CVE-2026-64391

Affected Products

Linux

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-64391 · Security Note
• https://git.kernel.org/stable/c/baa5e094886fffa7e6272edcb5e08be5ce28262c · Note
• https://git.kernel.org/stable/c/2b4592cea214683de0f2ce6f8c22c097fb0ea1ab · Note
• https://git.kernel.org/stable/c/a8f5d39971bbad9340d49cd41b0e2da9452a649d · Note
• https://git.kernel.org/stable/c/52a56cf53ec834c44ac1b4d16d585f26613ee5ce · Note