CVE-2021-45402
Summary
| CVE | CVE-2021-45402 |
|---|---|
| State | PUBLISHED |
| Assigner | mitre |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2022-02-11 15:15:07 UTC |
| Updated | 2026-10-08 21:17:42 UTC |
| Description | The check_alu_op() function in kernel/bpf/verifier.c in the Linux kernel through v5.16-rc5 did not properly update bounds while handling the mov32 instruction, which allows local users to obtain potentially sensitive address information, aka a "pointer leak." |
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: 0.004160000 probability, percentile 0.339970000 (date 2026-10-10)
Problem Types: CWE-668 | n/a
| 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 | Linux | Linux Kernel | All | All | All | All |
| Operating System | Linux | Linux Kernel | 5.16 | rc1 | All | All |
| Operating System | Linux | Linux Kernel | 5.16 | rc2 | All | All |
| Operating System | Linux | Linux Kernel | 5.16 | rc3 | All | All |
| Operating System | Linux | Linux Kernel | 5.16 | rc4 | All | All |
| Operating System | Linux | Linux Kernel | 5.16 | rc5 | All | All |
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| kernel/git/netdev/net.git - Netdev Group's networking tree | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Exploit, Patch, Vendor Advisory |
| kernel/git/netdev/net.git - Netdev Group's networking tree | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch, Vendor Advisory |
| kernel/git/netdev/net.git - Netdev Group's networking tree | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Exploit, Patch, Vendor Advisory |
| 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
- 179507 Debian Security Update for linux (CVE-2021-45402)
- 198708 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-5337-1)
- 198731 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-5368-1)
- 376925 Alibaba Cloud Linux Security Update for cloud-kernel (ALINUX3-SA-2022:0125)
- 377124 Alibaba Cloud Linux Security Update for cloud-kernel (ALINUX3-SA-2022:0029)
- 751952 OpenSUSE Security Update for Linux Kernel (openSUSE-SU-2022:1039-1)
- 752016 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:1039-1)
- 752370 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:2520-1)
- 753148 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:2615-1)
- 753348 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:1038-1)
- 753417 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:1163-1)
- 900711 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8609)
- 901652 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8605-1)
- 905964 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8609-1)
- 906435 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8605-2)