CVE-2021-33624

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Summary

CVECVE-2021-33624
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-06-23 16:15:07 UTC
Updated2026-10-08 21:17:35 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 4.7 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.009220000 probability, percentile 0.592150000 (date 2026-10-10)

Problem Types: CWE-843 | n/a

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary4.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
2.0[email protected]Primary4.7AV:L/AC:M/Au:N/C:C/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS v2.0 Breakdown

Access Vector
Local
Access Complexity
Medium
Authentication
None
Confidentiality
Complete
Integrity
None
Availability
None

AV:L/AC:M/Au:N/C:C/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 9.0 All All All
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
bpf: Fix leakage under speculation on mispredicted branches · torvalds/linux@9183671 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch, Third Party Advisory
An Analysis of Speculative Type Confusion Vulnerabilities in the Wild | USENIX af854a3a-2127-422b-91ae-364da2661108 www.usenix.org Third Party Advisory
[SECURITY] [DLA 2785-1] linux-4.19 security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Issue Tracking, Third Party Advisory
oss-security - [CVE-2021-33624] Linux kernel BPF protection against speculative execution attacks can be bypassed to read arbitrary kernel memory af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Exploit, Mailing List, Third Party Advisory
github.com/benschlueter/CVE-2021-33624 [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 178844 Debian Security Update for linux-4.19 (DLA 2785-1)
  • 179775 Debian Security Update for linux (CVE-2021-33624)
  • 198514 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-5091-1)
  • 198515 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-5092-1)
  • 198521 Ubuntu Security Notification for Linux kernel (Raspberry Pi) Vulnerabilities (USN-5091-2)
  • 198523 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-5092-2)
  • 198542 Ubuntu Security Notification for Linux kernel (OEM) Vulnerabilities (USN-5115-1)
  • 352489 Amazon Linux Security Advisory for kernel: ALAS2-2021-1685
  • 353145 Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.4-2022-006
  • 353158 Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.10-2022-002
  • 610400 Google Pixel Android March 2022 Security Patch Missing
  • 610408 Google Android April 2022 Security Patch Missing for Huawei EMUI
  • 670707 EulerOS Security Update for kernel (EulerOS-SA-2021-2465)
  • 670772 EulerOS Security Update for kernel (EulerOS-SA-2021-2530)
  • 670796 EulerOS Security Update for kernel (EulerOS-SA-2021-2554)
  • 750828 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:2305-1)
  • 750830 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:2321-1)
  • 750832 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:2324-1)
  • 750842 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:2352-1)
  • 750864 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:2421-1)
  • 750868 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:2427-1)
  • 750869 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:2422-1)
  • 750877 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:2427-1)
  • 900096 CBL-Mariner Linux Security Update for kernel 5.10.52.1
  • 900304 CBL-Mariner Linux Security Update for kernel 5.10.57.1
  • 900319 CBL-Mariner Linux Security Update for kernel 5.10.60.1
  • 901713 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (6564-1)
  • 903561 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (4376)
  • 906049 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (4376-1)

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