---
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:

  ocfs2: fix UBSAN array-index-out-of-bounds in ocfs2_sum_rightmost_rec

  [BUG]
  On-disk corruption setting l_next_free_rec to 0 in an inode's embedded
  extent 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'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

ocfs2: fix UBSAN array-index-out-of-bounds in ocfs2_sum_rightmost_rec

[BUG]
On-disk corruption setting l_next_free_rec to 0 in an inode's embedded
extent list triggers a UBSAN panic on the next write to that file.

[CAUSE]
ocfs2_sum_rightmost_rec() computes
i = le16_to_cpu(el->l_next_free_rec) - 1
and accesses el->l_recs[i] without validating i. When l_next_free_rec
is 0, i becomes -1; when l_next_free_rec exceeds l_count, i falls
past the end of the array. Either case violates the
__counted_by_le(l_count) annotation on l_recs[] and triggers UBSAN.

[FIX]
Validate the inode's embedded extent list when the inode is read, in
ocfs2_validate_inode_block(): l_count must be non-zero and no larger
than the inode block can hold, and l_next_free_rec must not exceed
l_count. A corrupt list is rejected at read time, before the b-tree
code can index l_recs[] out of bounds.

## Affected

- `Linux >= dcd0538ff4e854fa9d7f4630b359ca8fdb5cb5a8 < c286319746cef02bcce7384fda3a3f08989070d2`
- `Linux >= dcd0538ff4e854fa9d7f4630b359ca8fdb5cb5a8 < 720fb324cf0f5116318cae7f75cb393d118ffb67`
- `Linux >= dcd0538ff4e854fa9d7f4630b359ca8fdb5cb5a8 < 671889c553ea55e2da6a4f3b15f4c0fa40f2f0d1`
- `Linux >= dcd0538ff4e854fa9d7f4630b359ca8fdb5cb5a8 < 858aa4965ffa8c0d4bb5dd835ac4f1c9a1dcab85`
- `Linux >= dcd0538ff4e854fa9d7f4630b359ca8fdb5cb5a8 < 452a8467be8143747292218212671deeb186d2ae`
- `Linux 2.6.22`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.