CVE-2026-43076

HIGH EPSS 3.1%
Published May 6, 20261mo ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published May 6, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: ocfs2: validate inline data i_size during inode read When reading an inode from disk, ocfs2_validate_inode_block() performs various sanity checks but does not validate the size of inline data. If the filesystem is corrupted, an inode's i_size can exceed the actual inline data capacity (id_count). This causes ocfs2_dir_foreach_blk_id() to iterate beyond the inline data buffer, triggering a use-after-free when accessing directory entries from freed memory. In the syzbot report: - i_size was 1099511627576 bytes (~1TB) - Actual inline data capacity (id_count) is typically <256 bytes - A garbage rec_len (54648) caused ctx->pos to jump out of bounds - This triggered a UAF in ocfs2_check_dir_entry() Fix by adding a validation check in ocfs2_validate_inode_block() to ensure inodes with inline data have i_size <= id_count. This catches the corruption early during inode read and prevents all downstream code from operating on invalid data.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
3.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 12

VendorProductVersionRange
linuxlinux_kernel*≥2.6.24.1  –  <6.6.136
linuxlinux_kernel*≥6.7  –  <6.12.83
linuxlinux_kernel*≥6.13  –  <6.18.24
linuxlinux_kernel*≥6.19  –  <6.19.14
linuxlinux_kernel2.6.24any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/131c0b573e1b467b7d553e9ff38003f1acd8f5f2
  • git.kernel.org https://git.kernel.org/stable/c/1524af3685b35feac76662cc551cbc37bd14775f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/37f074e65f24f10f8d8df224a572e4cb9e6faf63
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/77d0295725109d77f5854ef5b58c0d06c08168cc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bcd46bc261b215b3b12c557a978299eafa02ecdd
  • git.kernel.org https://git.kernel.org/stable/c/c1de19e891be3bfb3e1d0c7cf07bbb8fb3b77c1b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cd2d765aa7157f852999842af32148128c735d39
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d012c782abcabe68b5b9e71be58a15e9f9d83dc1

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/1524af3685b35feac76662cc551cbc37bd14775f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/37f074e65f24f10f8d8df224a572e4cb9e6faf63
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/77d0295725109d77f5854ef5b58c0d06c08168cc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c1de19e891be3bfb3e1d0c7cf07bbb8fb3b77c1b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cd2d765aa7157f852999842af32148128c735d39
    Patch