Incorrect Conversion between Numeric Types in Linux kernel - CVE-2026-93147
Published: September 18, 2026
Vulnerability identifier: #VU150864
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-2026-93147
CWE-ID: CWE-681
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause BPF_REG_0 to contain a cpu_nr value with uncleared upper bits.
The vulnerability exists due to improper zero extension in the s390 BPF JIT compiler when compiling BPF instructions that invoke BPF_FUNC_get_smp_processor_id. A local user can execute a BPF program that invokes BPF_FUNC_get_smp_processor_id to cause BPF_REG_0 to contain a cpu_nr value with uncleared upper bits.
Affected software
Linux kernel
How to mitigate CVE-2026-93147
Install security update from vendor's repository.