Out-of-bounds read in Linux kernel - CVE-2026-64477
Published: July 27, 2026
Vulnerability identifier: #VU139455
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2026-64477
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds access in the resctrl RMID reader and limbo handler when offlining a monitoring domain with SNC enabled. A local user can trigger CPU offlining for a monitoring domain with an empty cpu_mask to cause a denial of service.
The issue occurs when LLC occupancy is tracked and the monitoring domain is going offline, causing a NUMA node lookup to be performed with nr_cpu_ids.
Affected software
Linux kernel
How to mitigate CVE-2026-64477
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3