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CVE-2021-33624

Date: June 23, 2021

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.

Severity Score

Related Resources (9)

http://www.openwall.com/lists/oss-security/2021/06/21/1
https://access.redhat.com/security/cve/CVE-2021-33624
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-33624
https://github.com/torvalds/linux/commit/9183671af6dbf60a1219371d4ed73e23f43b49db
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
https://security-tracker.debian.org/tracker/CVE-2021-33624
https://www.usenix.org/conference/usenixsecurity21/presentation/kirzner
https://nvd.nist.gov/vuln/detail/CVE-2021-33624
https://www.mend.io/vulnerability-database/CVE-2021-33624

Severity Score

Weakness Type (CWE)

Observable Discrepancy

CWE-203

Access of Resource Using Incompatible Type ('Type Confusion')

CWE-843

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): HIGH
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): COMPLETE
Integrity (I): NONE
Availability (A): NONE
Additional information:

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