linux: In the Linux kernel, the following vulnerability has been resolved: ksmbd: run set info with opener credentials SMB...
CVE-2026-64393 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-64393, released July 26, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
In the Linux kernel, the following vulnerability has been resolved: ksmbd: run set info with opener credentials SMB2 SET_INFO handlers call path-based VFS helpers after checking the access mask granted to the SMB handle. Those helpers perform their owner, inode permission and LSM checks using the current ksmbd worker credentials. Run the complete SET_INFO dispatch with the credentials captured when the handle was opened. This also removes the separate security information credential setup and keeps all SET_INFO classes under one credential scope. Direct override_creds() is used because it can nest with the request credential overrides already used by rename and link helpers.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| linux · Debian 12.15 (bookworm) | 6.1.180-1 | DEBIAN-CVE-2026-64393 | Jul 26, 2026 |
| linux · Debian 13.5 (trixie) | 6.12.96-1 | DEBIAN-CVE-2026-64393 | Jul 26, 2026 |
| linux · Debian 14 | 7.1.4-1 | DEBIAN-CVE-2026-64393 | Jul 26, 2026 |
| linux-6.12 · Debian 12.15 (bookworm) | 6.12.100-1~deb12u1 | DEBIAN-CVE-2026-64393 | Jul 26, 2026 |
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