Out-of-bounds read in Linux kernel - CVE-2026-46064
Published: May 28, 2026
Vulnerability identifier: #VU132428
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-46064
CWE-ID: CWE-125
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 privileged user to disclose sensitive information.
The vulnerability exists due to a heap-based buffer over-read in ibmasm_send_i2o_message() when processing a crafted dot command header from a user-supplied buffer. A local privileged user can supply a small buffer with inflated header fields to disclose sensitive information.
The over-read data is forwarded to the service processor over MMIO.
How to mitigate CVE-2026-46064
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/9aad71144fa3682cca3837a06c8623016790e7ec
- https://git.kernel.org/stable/c/9e8f6c9d4ecddda2f28baa1678340286cff3969c
- https://git.kernel.org/stable/c/c1c2417c60dbdca5ebb00462f21ee71c2d7f7083
- https://git.kernel.org/stable/c/fd19eb1c75047a4ed4e855f56cafd704dc3914e0
- https://git.kernel.org/stable/c/fe31722b0194ff76bf8b461e8bf97a2081147787