SB20260727227 - Out-of-bounds write in Linux kernel bpf
Published: July 27, 2026
Security Bulletin ID
SB20260727227
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 write (CVE-ID: CVE-2026-64354)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 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]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds write in btf_repeat_fields() when processing malformed user-supplied BTF during BPF_BTF_LOAD. A local user can submit crafted BTF data to cause a denial of service.
The issue arises from integer wraparound in the expanded field count calculation before repeated fields are copied into a fixed-size scratch array.
Remediation
Install update from vendor's website.