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URL: https://nvd.nist.gov/vuln/detail/CVE-2021-33624

⇱ NVD - CVE-2021-33624

  1. Vulnerabilities

CVE-2021-33624 Detail

Modified After Enrichment

This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.

Description

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
http://www.openwall.com/lists/oss-security/2021/06/21/1 CVE, MITRE Exploit  Mailing List  Third Party Advisory 
https://github.com/benschlueter/CVE-2021-33624 MITRE
https://github.com/torvalds/linux/commit/9183671af6dbf60a1219371d4ed73e23f43b49db CVE, MITRE Patch  Third Party Advisory 
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html CVE, MITRE Issue Tracking  Third Party Advisory 
https://www.usenix.org/conference/usenixsecurity21/presentation/kirzner CVE, MITRE Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-843 Access of Resource Using Incompatible Type ('Type Confusion') 👁 cwe source acceptance level
NIST  

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Denotes Vulnerable Software
Are we missing a CPE here? Please let us know.

Change History

8 change records found show changes

CVE Modified by MITRE 6/16/2026 11:54:53 PM

Action Type Old Value New Value
Added Affected 
[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}]

CVE Modified by MITRE 11/11/2025 11:15:33 AM

Action Type Old Value New Value
Added Reference 
https://github.com/benschlueter/CVE-2021-33624

CVE Modified by CVE 11/21/2024 1:09:13 AM

Action Type Old Value New Value
Added Reference 
http://www.openwall.com/lists/oss-security/2021/06/21/1
Added Reference 
https://github.com/torvalds/linux/commit/9183671af6dbf60a1219371d4ed73e23f43b49db
Added Reference 
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
Added Reference 
https://www.usenix.org/conference/usenixsecurity21/presentation/kirzner

CVE Modified by MITRE 5/14/2024 5:10:36 AM

Action Type Old Value New Value

CWE Remap by NIST 8/08/2023 10:22:24 AM

Action Type Old Value New Value
Changed CWE 
CWE-203



CWE-843


Modified Analysis by NIST 11/12/2021 3:15:15 PM

Action Type Old Value New Value
Added CPE Configuration 
OR
 *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
Changed Reference Type 
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html No Types Assigned


 
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html Issue Tracking, Third Party Advisory

CVE Modified by MITRE 10/15/2021 9:15:07 PM

Action Type Old Value New Value
Added Reference 
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html [No Types Assigned]

Initial Analysis by NIST 7/06/2021 9:32:31 AM

Action Type Old Value New Value
Added CVSS V3.1 
NIST AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Added CVSS V2 
NIST (AV:L/AC:M/Au:N/C:C/I:N/A:N)
Added CWE 
NIST CWE-203
Added CPE Configuration 
OR
 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 5.12.13
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/06/21/1 No Types Assigned


 
http://www.openwall.com/lists/oss-security/2021/06/21/1 Exploit, Mailing List, Third Party Advisory
Changed Reference Type 
https://github.com/torvalds/linux/commit/9183671af6dbf60a1219371d4ed73e23f43b49db No Types Assigned


 
https://github.com/torvalds/linux/commit/9183671af6dbf60a1219371d4ed73e23f43b49db Patch, Third Party Advisory
Changed Reference Type 
https://www.usenix.org/conference/usenixsecurity21/presentation/kirzner No Types Assigned


 
https://www.usenix.org/conference/usenixsecurity21/presentation/kirzner Third Party Advisory

Quick Info

CVE Dictionary Entry:
CVE-2021-33624
NVD Published Date:
06/23/2021
NVD Last Modified:
06/16/2026
Source:
MITRE