SB20260918184 - Improper input validation in Linux kernel bpf
Published: September 18, 2026
Security Bulletin ID
SB20260918184
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper input validation (CVE-ID: CVE-2026-93045)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to obtain an address below the arena mapping.
The vulnerability exists due to improper input validation in bpf_arena_free_pages() when freeing a scalar arena address below the low 32 bits of the arena base. A local user can free a crafted scalar arena address to obtain an address below the arena mapping.
Remediation
Install update from vendor's website.