ksmbd: use opener credentials for ADS I/O
CVE-2026-64391 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-64391, released July 26, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| linux · Debian 13.5 (trixie) | 6.12.96-1 | DEBIAN-CVE-2026-64391 | Jul 26, 2026 |
| linux · Debian 14 | 7.1.4-1 | DEBIAN-CVE-2026-64391 | Jul 26, 2026 |
| linux-6.12 · Debian 12.15 (bookworm) | 6.12.100-1~deb12u1 | DEBIAN-CVE-2026-64391 | Jul 26, 2026 |
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