CVE-2026-68457ksmbd: use opener credentials for FSCTL mutations
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: ksmbd: use opener credentials for FSCTL mutations SET_SPARSE, SET_ZERO_DATA and SET_COMPRESSION operate on an open SMB handle but call VFS xattr, fallocate or fileattr helpers with the current ksmbd worker credentials. Those helpers can revalidate inode permissions, ownership and LSM policy independently of the SMB handle access mask. Run each operation with the credentials captured in the target file when the handle was opened. Keep credential handling local to these single-file FSCTLs rather than applying session credentials to the complete IOCTL handler, which also contains handle-less and multi-handle operations.
- CVSS
- 9.1 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 18, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before a8c18434e1f0d9f7989170bdb0490c0160baf065; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 1e112c47ec5dd1942e2d4ca6e8e9b712238e20c2; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before fb1cae6302d58414ddf029e3f642711bd30243f7; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before e205f3e7e8c31a47cd11efb6cf663a527177e432; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before cfb2c6f71d61ed807c9d7a7af331d406f1f31877; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before c6394bcaf254c5baf9aff43376020be5db6d3316 | CNA record |
References
- https://git.kernel.org/stable/c/a8c18434e1f0d9f7989170bdb0490c0160baf065
- https://git.kernel.org/stable/c/1e112c47ec5dd1942e2d4ca6e8e9b712238e20c2
- https://git.kernel.org/stable/c/fb1cae6302d58414ddf029e3f642711bd30243f7
- https://git.kernel.org/stable/c/e205f3e7e8c31a47cd11efb6cf663a527177e432
- https://git.kernel.org/stable/c/cfb2c6f71d61ed807c9d7a7af331d406f1f31877
- https://git.kernel.org/stable/c/c6394bcaf254c5baf9aff43376020be5db6d3316
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.