Out-of-bounds write in Linux kernel - CVE-2026-64086
Published: July 20, 2026
Vulnerability identifier: #VU138549
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-2026-64086
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_pmbus_block_xfer() and read_buf in the adm1266 PMBus driver when processing a max-length block read response with a PEC byte. A local user can trigger the driver to process a crafted response to cause a denial of service.
The same condition can also cause an out-of-bounds read during the subsequent PEC comparison.
How to mitigate CVE-2026-64086
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/2279c342d94eca225bf9f301c8806a05a1c81619
- https://git.kernel.org/stable/c/397d3f523bfff2f4e3dacf9b1339bd76dc207f78
- https://git.kernel.org/stable/c/472744f69d25a2d5111ad62f1d62579dce2c13c8
- https://git.kernel.org/stable/c/487566cb1ccdf3756fdd7bf8d875e612ff3169bb
- https://git.kernel.org/stable/c/528a9f88e88502d0c2f2052a279415074cd83715
- https://git.kernel.org/stable/c/a6c802145a8de0830bca803c6d415f7e9e683624
- https://git.kernel.org/stable/c/bd5be3fa5de6dbf61f1b3cec6b79c2c2f8065694
- https://git.kernel.org/stable/c/d94ceb16e55b6d8019ab069e357c76ac42f0ffbc