Improper input validation in Linux kernel - CVE-2026-93045
Published: September 18, 2026
Vulnerability identifier: #VU150983
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-93045
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-93045
Install security update from vendor's repository.