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CVE PROGRAM SOURCE RECORD9.1 Critical

CVE-2026-68457

ksmbd: use opener credentials for FSCTL mutations

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < a8c18434e1f0d9f7989170bdb0490c0160baf065affected
  • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < 1e112c47ec5dd1942e2d4ca6e8e9b712238e20c2affected
  • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < fb1cae6302d58414ddf029e3f642711bd30243f7affected
  • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < e205f3e7e8c31a47cd11efb6cf663a527177e432affected
  • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < cfb2c6f71d61ed807c9d7a7af331d406f1f31877affected
  • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < c6394bcaf254c5baf9aff43376020be5db6d3316affected

Linux Linux

Default version status: affected

  • 5.15affected
  • 0 to < 5.15unaffected
  • 6.1.178 to ≤ 6.1.*unaffected
  • 6.6.145 to ≤ 6.6.*unaffected
  • 6.12.97 to ≤ 6.12.*unaffected
  • 6.18.40 to ≤ 6.18.*unaffected
  • 7.1.5 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References