CVE-2021-4159

Medium

A vulnerability was found in the Linux kernel's EBPF verifier when handling internal data structures. Internal memory locations could be returned to userspace. A local attacker with the permissions to insert eBPF code to the kernel can use this to leak internal kernel memory details defeating some of the exploit mitigations in place for the kernel.

Package Linux Kernel
Published 2022-08-24
Last modified 2024-11-21
CVSS version 3.1
Patch available
Awaiting data

CVSS 3.1 score

4.4

out of 10
Medium
Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Vector string
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

Weakness type

CWE-202

CVE-2021-4159 is classified as CWE-202

See CWE-202 on MITRE CWE for full details on this weakness type.

References

The following references provide additional information about CVE-2021-4159 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Frequently asked questions

  • What is CVE-2021-4159?

    CVE-2021-4159 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.4 out of 10 . CVE-2021-4159 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2021-4159?

    CVE-2021-4159 has a CVSS score of 4.4 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N .

  • Is there a patch available for CVE-2021-4159?

    No patch is currently available for CVE-2021-4159. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

  • Is CVE-2021-4159 actively exploited?

    No — CVE-2021-4159 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Back to
All CVEs
View on
NVD / NIST