CVE-2026-93147
kernel: s390/bpf: Replace ly instruction with llgf
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 17, 2026
Updated · October 20, 2026
Description
A flaw was found in the kernel. The s390/bpf component incorrectly handles the loading of a 32-bit CPU number (cpu_nr) into a 64-bit BPF register (BPF_REG_0). The ly instruction, used for this operation, fails to clear the upper bits of the 64-bit register. This oversight could lead to the unintended exposure of data or integrity issues within the BPF program execution, potentially impacting system stability or security.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-908 · Use of Uninitialized Resource