CVE-2026-74349

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxaa89762c54800208d5afdcd8e6bf124818f17fe0 < d903d59c0315f59bdf0214b4f13d71c9feb2c45caffected
LinuxLinuxaa89762c54800208d5afdcd8e6bf124818f17fe0 < 441abb77222f155e8d931dbabb465466db01cfd7affected
LinuxLinuxaa89762c54800208d5afdcd8e6bf124818f17fe0 < e652d0f5108e447b22da4249bcd23dd1b63c73ddaffected
LinuxLinuxaa89762c54800208d5afdcd8e6bf124818f17fe0 < 346314bb0cc2fc52b50b73d6ecc62e0217455c2eaffected
LinuxLinuxaa89762c54800208d5afdcd8e6bf124818f17fe0 < 06c0a0431b9856506fcd9b2c1b0c6136567d756daffected
LinuxLinuxaa89762c54800208d5afdcd8e6bf124818f17fe0 < 3fa7139b5f42731a61f78c42433adae13f9adc21affected
LinuxLinuxaa89762c54800208d5afdcd8e6bf124818f17fe0 < 2c13e02592b918be7725ab5965e01ef4e46c4b57affected
LinuxLinuxaa89762c54800208d5afdcd8e6bf124818f17fe0 < ca1afd88f5eaaff9168e1466e5401385edf59543affected
LinuxLinux3.14affected
LinuxLinux0 < 3.14unaffected
LinuxLinux5.10.261 <= 5.10.*unaffected
LinuxLinux5.15.212 <= 5.15.*unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References