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.

https://git.kernel.org/stable/c/1e112c47ec5dd1942e2d4ca6e8e9b712238e20c2

https://git.kernel.org/stable/c/a8c18434e1f0d9f7989170bdb0490c0160baf065

https://git.kernel.org/stable/c/c6394bcaf254c5baf9aff43376020be5db6d3316

https://git.kernel.org/stable/c/cfb2c6f71d61ed807c9d7a7af331d406f1f31877

https://git.kernel.org/stable/c/e205f3e7e8c31a47cd11efb6cf663a527177e432

https://git.kernel.org/stable/c/fb1cae6302d58414ddf029e3f642711bd30243f7

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