ksmbd: require source read access for duplicate extents
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.4%
exploitation probability
0.4%top 67% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: require source read access for duplicate extents
FSCTL_DUPLICATE_EXTENTS_TO_FILE passes the source file directly to
vfs_clone_file_range() or vfs_copy_file_range() without checking the SMB
access mask granted to the source handle. A handle opened with attribute
access can consequently be used to copy file contents into an
attacker-readable destination.
Require FILE_READ_DATA on the source handle before either VFS operation,
matching other ksmbd data-copy paths.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/2d2ab6983620c2d60ce7db72133984ca3873b929https://git.kernel.org/stable/c/67bdad9cf01b25030e3bf00bbce6c309319d6663https://git.kernel.org/stable/c/a10942af27832c2761d020863a46e79bebe0567dhttps://git.kernel.org/stable/c/b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5fhttps://git.kernel.org/stable/c/cedff600f1642aa982178503552f0d007bc829c8https://git.kernel.org/stable/c/db231af842868268839f9f9619c68cb27830d8be