Vulnerability Details : CVE-2021-3444
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.
Vulnerability category: Information leak
Products affected by CVE-2021-3444
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-3444
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 8 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-3444
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
4.6
|
MEDIUM | AV:L/AC:L/Au:N/C:P/I:P/A:P |
3.9
|
6.4
|
NIST | |
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
NIST | |
7.8
|
HIGH | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H |
1.1
|
6.0
|
Canonical Ltd. |
CWE ids for CVE-2021-3444
-
The product reads data past the end, or before the beginning, of the intended buffer.Assigned by: nvd@nist.gov (Primary)
-
When converting from one data type to another, such as long to integer, data can be omitted or translated in a way that produces unexpected values. If the resulting values are used in a sensitive context, then dangerous behaviors may occur.Assigned by:
- nvd@nist.gov (Primary)
- security@ubuntu.com (Secondary)
References for CVE-2021-3444
-
http://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.html
Kernel Live Patch Security Notice LSN-0082-1 ≈ Packet StormThird Party Advisory;VDB Entry
-
http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html
Kernel Live Patch Security Notice LSN-0075-1 ≈ Packet StormThird Party Advisory;VDB Entry
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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9b00f1b78809
kernel/git/torvalds/linux.git - Linux kernel source treeMailing List;Patch;Vendor Advisory
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https://www.openwall.com/lists/oss-security/2021/03/23/2
oss-security - [CVE-2021-3444] Linux kernel bpf verifier incorrect mod32 truncationMailing List;Third Party Advisory
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https://security.netapp.com/advisory/ntap-20210416-0006/
CVE-2021-3444 Linux Kernel Vulnerability in NetApp Products | NetApp Product SecurityThird Party Advisory
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https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
[SECURITY] [DLA 2785-1] linux-4.19 security updateMailing List;Third Party Advisory
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http://www.openwall.com/lists/oss-security/2021/03/23/2
oss-security - [CVE-2021-3444] Linux kernel bpf verifier incorrect mod32 truncationMailing List;Third Party Advisory
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