# CVE-2021-20320: linux: A flaw was found in s390 eBPF JIT in bpf_jit_insn in arch/s390/net/bpf_jit_comp.c in the Linux kernel

CVE-2021-20320 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-20320, released February 18, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-20320
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 18, 2022

## Description

A flaw was found in s390 eBPF JIT in bpf_jit_insn in arch/s390/net/bpf_jit_comp.c in the Linux kernel. In this flaw, a local attacker with special user privilege can circumvent the verifier and may lead to a confidentiality problem.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.14.9-1 | [DEBIAN-CVE-2021-20320](https://patchblox.com/security/data/fix/linux/debian-cve-2021-20320.md) | Feb 18, 2022 |
| Linux | linux Debian 13.5 (trixie) | 5.14.9-1 | [DEBIAN-CVE-2021-20320](https://patchblox.com/security/data/fix/linux/debian-cve-2021-20320.md) | Feb 18, 2022 |
| Linux | linux Debian 14 | 5.14.9-1 | [DEBIAN-CVE-2021-20320](https://patchblox.com/security/data/fix/linux/debian-cve-2021-20320.md) | Feb 18, 2022 |

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