Out-of-bounds write in Linux kernel - CVE-2026-64087
Published: July 20, 2026
Vulnerability identifier: #VU138550
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-2026-64087
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 a malformed BLACKBOX_INFO response. A local user can provide a device response with an implausible blackbox record count to cause a denial of service.
The issue can be triggered by a non-responsive slave returning 0xff, bus corruption, or firmware bugs in the device response.
How to mitigate CVE-2026-64087
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/0e791cd0140fb136083565aadfbe0f705aa260d0
- https://git.kernel.org/stable/c/231db52a5b64d0a9769e298dadc148e1f79b26a6
- https://git.kernel.org/stable/c/4afca954622d672ea65ed961bed01cf91caa034e
- https://git.kernel.org/stable/c/5469e1e7c411acc15fdd8262c99c3ebd9defd594
- https://git.kernel.org/stable/c/75c862adf3d3caab4f49bb3530723c215376e37c
- https://git.kernel.org/stable/c/adcb163ad7cacca317872fc62bd8885e842e45e3
- https://git.kernel.org/stable/c/c2c56092710fe8a893b67b5a3d7e62808d02d84d
- https://git.kernel.org/stable/c/f85c81e93dbd6915970bd5f3bffcf62633c4c54c