Incorrect Calculation of Buffer Size in Linux kernel - CVE-2026-43044
Published: May 2, 2026
Vulnerability identifier: #VU128872
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-43044
CWE-ID: CWE-131
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 corrupt memory.
The vulnerability exists due to improper memory allocation in the caam crypto driver when processing HMAC keys longer than the block size. A local user can supply a specially crafted long HMAC key to corrupt memory.
The issue occurs because the buffer size was not allocated using the rounded DMA cache alignment size.
How to mitigate CVE-2026-43044
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/5ddfdcbe10dc5f97afc4e46ca22be2be717e8caf
- https://git.kernel.org/stable/c/68feed135a0c7243a9275ae7e6a18260f755f52b
- https://git.kernel.org/stable/c/a7ecf06d3ee06e9b3322e1e7b003ea5c6f6e135a
- https://git.kernel.org/stable/c/c0c133e0225d87aad326bb90bbce9bdd6fde3cbb
- https://git.kernel.org/stable/c/f2af8be110bde26b3e3354efdfdda97f426306a4