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.

CVSS v3 7.1 HIGH

7.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.2

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
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

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-15 06:22

Updated : 2026-08-17 06:19

NVD link : CVE-2026-74349

Mitre link : CVE-2026-74349

CVE.ORG link : CVE-2026-74349

JSON object : View

Products Affected

No product.

CWE

No CWE.

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The later start + len - 1 and len -= ... \narithmetic then underflows and can drive trimming past the requested\nrange.\n\nReject ranges shorter than s_clustersize instead. That preserves the\nexisting -EINVAL behavior for requests that cannot discard even one\nallocation unit and keeps zero-cluster trims out of the group walk."}], "lastModified": "2026-08-17T06:19:29.533", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}