CVE-2026-74349

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.