CVEvulnerability
CVE-2021-33624
4.7 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2021-06-23
- Last modified
- 2026-10-08
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 4.7 MEDIUM — CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
- CVSS 2.0 ([email protected])
- 4.7 MEDIUM — AV:L/AC:M/Au:N/C:C/I:N/A:N
- Weaknesses
- CWE-843
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.
Affected configurations
• linux linux kernel (< 5.12.13)
• debian debian linux 9.0
Related
Weakness · CWE (1)
- CWE-843 Access of Resource Using Incompatible Type weakness
References
- http://www.openwall.com/lists/oss-security/2021/06/21/1 Exploit, Mailing List, Third Party Advisory
- https://github.com/benschlueter/CVE-2021-33624 github.com
- https://github.com/torvalds/linux/commit/9183671af6dbf60a1219371d4ed73e23f43b49db Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html Issue Tracking, Third Party Advisory
- https://www.usenix.org/conference/usenixsecurity21/presentation/kirzner Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/06/21/1 Exploit, Mailing List, Third Party Advisory
- https://github.com/torvalds/linux/commit/9183671af6dbf60a1219371d4ed73e23f43b49db Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html Issue Tracking, Third Party Advisory
- https://www.usenix.org/conference/usenixsecurity21/presentation/kirzner Third Party Advisory