CVE-2021-3444

High

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.

Package Linux Kernel
Published 2021-03-23
Last modified 2024-11-21
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

7.8

out of 10
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness type

CWE-681

CVE-2021-3444 is a Incorrect Conversion Between Numeric Types vulnerability

What is Incorrect Conversion Between Numeric Types?

The product converts from one data type to another but uses a function that can produce incorrect results. Learn more on MITRE CWE

Affected versions

Linux kernel versions trunk, 5.11, 5.10, 5.4 and later are affected. Fixed in 5.12-rc1, 5.11.2, 5.10.19, 5.4.101 and their respective stable series.

Affected from
≥ trunk ≥ 5.11 ≥ 5.10 ≥ 5.4
Fixed in
✓ 5.12-rc1 ✓ 5.11.2 5.11.x ✓ 5.10.19 5.10.x ✓ 5.4.101 5.4.x

References

7 total
Showing 5 of 7 references View all on NVD

Frequently asked questions

  • What is CVE-2021-3444?

    CVE-2021-3444 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Incorrect Conversion Between Numeric Types flaw (CWE-681) . It affects Linux kernel versions from trunk onward and has been patched in 5.12-rc1, 5.11.2, 5.10.19 and others. CVE-2021-3444 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2021-3444?

    CVE-2021-3444 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H .

  • Is there a patch available for CVE-2021-3444?

    Yes. CVE-2021-3444 has been patched. Fixed versions include 5.12-rc1, 5.11.2, 5.10.19 and others. If you are running Linux kernel trunk or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2021-3444 actively exploited?

    No. CVE-2021-3444 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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