CVE-2021-20320
Summary
| CVE | CVE-2021-20320 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2022-02-18 18:15:08 UTC |
| Updated | 2026-10-08 21:17:33 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 5.5 MEDIUM from [email protected]
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS: 0.002600000 probability, percentile 0.163400000 (date 2026-10-10)
Problem Types: CWE-200 | NVD-CWE-Other | CWE-200 CWE-200
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 5.5 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| 2.0 | [email protected] | Primary | 2.1 | AV:L/AC:L/Au:N/C:P/I:N/A:N |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
NoneAvailability
NoneCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS v2.0 Breakdown
Access Vector
LocalAccess Complexity
LowAuthentication
NoneConfidentiality
PartialIntegrity
NoneAvailability
NoneAV:L/AC:L/Au:N/C:P/I:N/A:N
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Fedoraproject | Fedora | 34 | All | All | All |
| Operating System | Linux | Linux Kernel | All | All | All | All |
| Operating System | Linux | Linux Kernel | 5.15 | - | All | All |
| Operating System | Linux | Linux Kernel | 5.15 | rc1 | All | All |
| Operating System | Linux | Linux Kernel | 5.15 | rc2 | All | All |
| Operating System | Redhat | Enterprise Linux | 7.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 8.0 | All | All | All |
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| [PATCH bpf-next 00/13] bpf/tests: Extend JIT test suite coverage - Johan Almbladh | af854a3a-2127-422b-91ae-364da2661108 | lore.kernel.org | |
| 2010090 – (CVE-2021-20320) CVE-2021-20320 kernel: s390 eBPF JIT miscompilation issues fixes | af854a3a-2127-422b-91ae-364da2661108 | bugzilla.redhat.com | Issue Tracking, Third Party Advisory |
| [PATCH bpf-next 00/13] bpf/tests: Extend JIT test suite coverage - Johan Almbladh | MITRE | lore.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Legacy QID Mappings
- 180270 Debian Security Update for linux (CVE-2021-20320)
- 353242 Amazon Linux Security Advisory for kernel : ALAC2012-2022-036
- 353243 Amazon Linux Security Advisory for kmod-mlx5 : ALAC2012-2022-037
- 353244 Amazon Linux Security Advisory for kmod-sfc : ALAC2012-2022-038
- 751473 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:3969-1)
- 900717 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8797)
- 906010 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8797-1)