Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-06-24T00:00:00 kernel: s390/bpf: Zero-extend bpf prog return values and kfunc arguments 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CWE-681

In the Linux kernel, the following vulnerability has been resolved: s390/bpf: Zero-extend bpf prog return values and kfunc arguments s390x ABI requires callers to zero-extend unsigned arguments and sign-extend signed arguments, and callees to zero-extend unsigned return values and sign-extend signed return values. s390 BPF JIT currently implements only sign extension. Fix this omission and implement zero extension too.

A flaw was found in the Linux kernel's BPF (Berkeley Packet Filter) JIT (Just-In-Time) compiler for the s390x architecture. The system's Application Binary Interface (ABI) requires that unsigned arguments and return values be zero-extended. However, the BPF JIT compiler incorrectly performed only sign extension. This could lead to unexpected behavior or data integrity issues when BPF programs interact with kernel functions on s390x systems.

Red Hat Enterprise Linux 10 Affected kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Affected kernel Red Hat Enterprise Linux 9 Affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-53110 https://nvd.nist.gov/vuln/detail/CVE-2026-53110 https://lore.kernel.org/linux-cve-announce/2026062414-CVE-2026-53110-c958@gregkh/T