Out-of-bounds write in Linux kernel - CVE-2026-64084
Published: July 20, 2026
Vulnerability identifier: #VU138547
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-64084
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 disclose sensitive information and corrupt memory.
The vulnerability exists due to an out-of-bounds read and out-of-bounds write in adm1266_gpio_get_multiple() in the adm1266 PMBus driver when iterating a caller-supplied gpio mask. A local user can trigger access to bits beyond the end of the supplied mask and bits arrays to disclose sensitive information and corrupt memory.
The iteration uses a PMBus command value as the scan bound instead of the number of PDIO pins.
How to mitigate CVE-2026-64084
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/17cee2f59029039416e8f6303050038eb59ba149
- https://git.kernel.org/stable/c/299efd14c2eda7e5fd40025e54addd4151a01081
- https://git.kernel.org/stable/c/2aef8f08c479f4cbc83e1e6b19d1c94d4dd24f17
- https://git.kernel.org/stable/c/4d1da9a6be5a8156c532d571c2ed237169f99244
- https://git.kernel.org/stable/c/b96c7f0bc0713dc6403912f6527d4ff9168d6fe6
- https://git.kernel.org/stable/c/d0593e15fdeb56048a72c5c6e720f702759d0ccd
- https://git.kernel.org/stable/c/d7834d92251baade796812876e95555e2066fa9f
- https://git.kernel.org/stable/c/fa7ca363069a70b0d1aa51e8892e3095fe2ac1ec