Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-64211
Published: July 27, 2026
Vulnerability identifier: #VU139793
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-2026-64211
CWE-ID: CWE-703
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 improper handling of cpu online state in Tree SRCU callback scheduling in kernel/rcu/srcutree.c when invoking SRCU operations on a CPU that is not yet fully online. A local user can trigger SRCU callback processing from such a CPU to cause a denial of service.
The issue can result in hangs on s390 systems.
How to mitigate CVE-2026-64211
Install security update from vendor's repository.