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Status published
Medium
CVE-2021-33624
In kernel/bpf/verifier.c in the Linux kernel before 5.12.13, a branch...
Vulnerability 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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
No credits recorded in the NVD database.
References
- https://www.usenix.org/conference/usenixsecurity21/presentation/kirzner
- http://www.openwall.com/lists/oss-security/2021/06/21/1
- https://github.com/torvalds/linux/commit/9183671af6dbf60a1219371d4ed73e23f43b49db
- https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
- https://github.com/benschlueter/CVE-2021-33624
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Affected Vendor
linux
View all reports →Affected Software
linux kernel, debian linux
Vulnerable Versions:
0, 9.0
Timeline
Official Publish:
June 23rd, 2021
Last Modified:
November 11th, 2025
Added to House:
July 21st, 2026
CVSS Vectors
V3:
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Weaknesses (CWE)
No CWE data available
MITRE ATT&CK TTPs
No associated TTPs found for this vulnerability.