CVE-2021-3444
7.8 HIGHThe bpf verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to ...
Published: 2021-03-23 · Last updated: 2026-06-17
Severity and scoring
- CVSS
- 7.8 HIGH
- Vector
- CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- CWE
- CWE-125, CWE-681
Affected products
| Vendor | Product |
|---|---|
| canonical | debian_linux, linux_kernel, ubuntu_linux |
| debian | debian_linux, linux_kernel, ubuntu_linux |
| linux | debian_linux, linux_kernel, ubuntu_linux |
Description
The bpf verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker with the ability to load bpf programs could use this gain out-of-bounds reads in kernel memory leading to information disclosure (kernel memory), and possibly out-of-bounds writes that could potentially lead to code execution. This issue was addressed in the upstream kernel in commit 9b00f1b78809 ("bpf: Fix truncation handling for mod32 dst reg wrt zero") and in Linux stable kernels 5.11.2, 5.10.19, and 5.4.101.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2021-3444
- [Other]http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html
- [Other]http://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.html
- [Other]http://www.openwall.com/lists/oss-security/2021/03/23/2
- [Patch]https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9b00f1b78809
- [Other]https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
- [Other]https://security.netapp.com/advisory/ntap-20210416-0006/
- [Other]https://www.openwall.com/lists/oss-security/2021/03/23/2
- [Other]http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html
- [Other]http://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.html
- [Other]http://www.openwall.com/lists/oss-security/2021/03/23/2
- [Patch]https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9b00f1b78809
- [Other]https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
- [Other]https://security.netapp.com/advisory/ntap-20210416-0006/
- [Other]https://www.openwall.com/lists/oss-security/2021/03/23/2
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