CVE-2026-74349
Description
AI Translation Available
In the Linux kernel, the following vulnerability has been resolved:
ocfs2: reject FITRIM ranges shorter than a cluster
ocfs2_trim_mainbm() trims the global bitmap in cluster units, but its
too-short range validation only checks sb->s_blocksize.
On filesystems with a cluster size larger than the block size, a FITRIM
range that is at least one block but shorter than one cluster is accepted
and shifted down to len == 0. The later start + len - 1 and len -= ...
arithmetic then underflows and can drive trimming past the requested
range.
Reject ranges shorter than s_clustersize instead. That preserves the
existing -EINVAL behavior for requests that cannot discard even one
allocation unit and keeps zero-cluster trims out of the group walk.
https://git.kernel.org/stable/c/06c0a0431b9856506fcd9b2c1b0c6136567d756d
https://git.kernel.org/stable/c/2c13e02592b918be7725ab5965e01ef4e46c4b57
https://git.kernel.org/stable/c/346314bb0cc2fc52b50b73d6ecc62e0217455c2e
https://git.kernel.org/stable/c/3fa7139b5f42731a61f78c42433adae13f9adc21
https://git.kernel.org/stable/c/441abb77222f155e8d931dbabb465466db01cfd7
https://git.kernel.org/stable/c/ca1afd88f5eaaff9168e1466e5401385edf59543
https://git.kernel.org/stable/c/d903d59c0315f59bdf0214b4f13d71c9feb2c45c
https://git.kernel.org/stable/c/e652d0f5108e447b22da4249bcd23dd1b63c73dd