Use-after-free in Linux kernel - CVE-2026-43076
Published: May 7, 2026
Vulnerability identifier: #VU130683
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-43076
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in ocfs2_dir_foreach_blk_id() when processing a corrupted ocfs2 filesystem inode with inline data. A local user can mount or supply a crafted filesystem image to cause a denial of service.
The issue is triggered when an inode's i_size exceeds the actual inline data capacity, causing directory entry iteration to go beyond the inline data buffer.
How to mitigate CVE-2026-43076
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/1524af3685b35feac76662cc551cbc37bd14775f
- https://git.kernel.org/stable/c/37f074e65f24f10f8d8df224a572e4cb9e6faf63
- https://git.kernel.org/stable/c/77d0295725109d77f5854ef5b58c0d06c08168cc
- https://git.kernel.org/stable/c/c1de19e891be3bfb3e1d0c7cf07bbb8fb3b77c1b
- https://git.kernel.org/stable/c/cd2d765aa7157f852999842af32148128c735d39