Out-of-bounds write in Linux kernel - CVE-2026-64085
Published: July 20, 2026
Vulnerability identifier: #VU138548
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-2026-64085
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 adm1266_nvmem_read_blackbox() when processing device-supplied blackbox records. A local user can provide a device response with more than 64 bytes in a trailing record to cause a denial of service.
The issue occurs because the helper may write up to 255 bytes into a 64-byte record slot before the returned length is validated.
How to mitigate CVE-2026-64085
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/43cae21424ff8e33894a0f86c6b80b840c049fd7
- https://git.kernel.org/stable/c/6098634cfa711f11a8d65368dc51ec8f7c8241ba
- https://git.kernel.org/stable/c/60c4b9fe1a3dd012014b1f561a6928a0b5db1126
- https://git.kernel.org/stable/c/7896d87cbb05e097efc113243d4e38f9f8cea16c
- https://git.kernel.org/stable/c/83e039f0a43e0708515b0479cb7690fb93faaaa0
- https://git.kernel.org/stable/c/97a9cf2a8217ca1cdaf48cb9ab26e471632c7e7f
- https://git.kernel.org/stable/c/9d5309500b4607b7198e19f0a3fa13eb864cd5fb
- https://git.kernel.org/stable/c/dd47b8c4a0a8ced442da3f008db28fbbd31feaf0