{"id":"CVE-2026-72162","title":"ocfs2: fix UBSAN array-index-out-of-bounds in ocfs2_sum_rightmost_rec","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix UBSAN array-index-out-of-bounds in ocfs2_sum_rightmost_rec\n\n[BUG]\nOn-disk corruption setting l_next_free_rec to 0 in an inode's embedded\nextent list triggers…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= dcd0538ff4e854fa9d7f4630b359ca8fdb5cb5a8 < c286319746cef02bcce7384fda3a3f08989070d2","Linux >= dcd0538ff4e854fa9d7f4630b359ca8fdb5cb5a8 < 720fb324cf0f5116318cae7f75cb393d118ffb67","Linux >= dcd0538ff4e854fa9d7f4630b359ca8fdb5cb5a8 < 671889c553ea55e2da6a4f3b15f4c0fa40f2f0d1","Linux >= dcd0538ff4e854fa9d7f4630b359ca8fdb5cb5a8 < 858aa4965ffa8c0d4bb5dd835ac4f1c9a1dcab85","Linux >= dcd0538ff4e854fa9d7f4630b359ca8fdb5cb5a8 < 452a8467be8143747292218212671deeb186d2ae","Linux 2.6.22"],"published":"2026-08-15","updated":"2026-10-21","sourceUpdated":"2026-10-21T12:44:24.092Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72162","references":[{"url":"https://git.kernel.org/stable/c/c286319746cef02bcce7384fda3a3f08989070d2"},{"url":"https://git.kernel.org/stable/c/720fb324cf0f5116318cae7f75cb393d118ffb67"},{"url":"https://git.kernel.org/stable/c/671889c553ea55e2da6a4f3b15f4c0fa40f2f0d1"},{"url":"https://git.kernel.org/stable/c/858aa4965ffa8c0d4bb5dd835ac4f1c9a1dcab85"},{"url":"https://git.kernel.org/stable/c/452a8467be8143747292218212671deeb186d2ae"}],"tags":["cve.org"],"epss":0.00162,"epssPercentile":0.04952,"ingestedAt":"2026-10-21T12:48:53.595Z","slug":"CVE-2026-72162","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix UBSAN array-index-out-of-bounds in ocfs2_sum_rightmost_rec\n\n[BUG]\nOn-disk corruption setting l_next_free_rec to 0 in an inode's embedded\nextent list triggers a UBSAN panic on the next write to that file.\n\n[CAUSE]\nocfs2_sum_rightmost_rec() computes\ni = le16_to_cpu(el->l_next_free_rec) - 1\nand accesses el->l_recs[i] without validating i. When l_next_free_rec\nis 0, i becomes -1; when l_next_free_rec exceeds l_count, i falls\npast the end of the array. Either case violates the\n__counted_by_le(l_count) annotation on l_recs[] and triggers UBSAN.\n\n[FIX]\nValidate the inode's embedded extent list when the inode is read, in\nocfs2_validate_inode_block(): l_count must be non-zero and no larger\nthan the inode block can hold, and l_next_free_rec must not exceed\nl_count. A corrupt list is rejected at read time, before the b-tree\ncode can index l_recs[] out of bounds.\n\n## Affected\n\n- `Linux >= dcd0538ff4e854fa9d7f4630b359ca8fdb5cb5a8 < c286319746cef02bcce7384fda3a3f08989070d2`\n- `Linux >= dcd0538ff4e854fa9d7f4630b359ca8fdb5cb5a8 < 720fb324cf0f5116318cae7f75cb393d118ffb67`\n- `Linux >= dcd0538ff4e854fa9d7f4630b359ca8fdb5cb5a8 < 671889c553ea55e2da6a4f3b15f4c0fa40f2f0d1`\n- `Linux >= dcd0538ff4e854fa9d7f4630b359ca8fdb5cb5a8 < 858aa4965ffa8c0d4bb5dd835ac4f1c9a1dcab85`\n- `Linux >= dcd0538ff4e854fa9d7f4630b359ca8fdb5cb5a8 < 452a8467be8143747292218212671deeb186d2ae`\n- `Linux 2.6.22`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}