Out-of-bounds write in Linux kernel - CVE-2026-43075
Published: May 7, 2026
Vulnerability identifier: #VU130682
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-2026-43075
CWE-ID: CWE-787
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 an out-of-bounds write in ocfs2_write_end_inline when processing writes during copy_file_range splice fallback on a corrupted ocfs2 filesystem mounted on a loop device. A local user can trigger the kernel to write past the inode block buffer to cause a denial of service.
The issue is caused by trusting the on-disk id_count field beyond the physical maximum inline data capacity.
How to mitigate CVE-2026-43075
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/0c1af902223b6fcedb60904ca0b551254686c7b9
- https://git.kernel.org/stable/c/69d3c69ade1e4285ab4ca48fe7acee0767e65604
- https://git.kernel.org/stable/c/7bc5da4842bed3252d26e742213741a4d0ac1b14
- https://git.kernel.org/stable/c/947f953978b0d9463498d548d0f054f5a75be2e9
- https://git.kernel.org/stable/c/e2c9dc6b6e96f3585f2a1062ca3374a52db0938f