SB20260720201 - Out-of-bounds read in Linux kernel mm
Published: July 20, 2026
Security Bulletin ID
SB20260720201
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2026-64036)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local privileged user to cause a denial of service.
The vulnerability exists due to an out-of-bounds access in the css_rstat_updated() BPF kfunc when processing a caller-provided cpu argument. A local privileged user can pass an invalid cpu value to trigger an out-of-bounds access and cause a denial of service.
Exploitation requires a BPF iter/cgroup program with CAP_BPF and CAP_PERFMON.
Remediation
Install update from vendor's website.