CVE-2021-33624

Medium

In kernel/bpf/verifier.c in the Linux kernel before 5.12.13, a branch can be mispredicted (e.g., because of type confusion) and consequently an unprivileged BPF program can read arbitrary memory locations via a side-channel attack, aka CID-9183671af6db.

Package Linux Kernel
Published 2021-06-23
Last modified 2025-11-11
CVSS version 3.1
Patch available
Awaiting data

CVSS 3.1 score

4.7

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

Weakness type

CWE-843

CVE-2021-33624 is classified as CWE-843

See CWE-843 on MITRE CWE for full details on this weakness type.

References

5 total

Frequently asked questions

  • What is CVE-2021-33624?

    CVE-2021-33624 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.7 out of 10 . CVE-2021-33624 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2021-33624?

    CVE-2021-33624 has a CVSS score of 4.7 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N .

  • Is there a patch available for CVE-2021-33624?

    Monitor the NIST NVD and your Linux distribution's security advisories for CVE-2021-33624 patch availability.

  • Is CVE-2021-33624 actively exploited?

    No. CVE-2021-33624 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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