CVE-2021-3490

High

The eBPF ALU32 bounds tracking for bitwise ops (AND, OR and XOR) in the Linux kernel did not properly update 32-bit bounds, which could be turned into out of bounds reads and writes in the Linux kernel and therefore, arbitrary code execution. This issue was fixed via commit 049c4e13714e ("bpf: Fix alu32 const subreg bound tracking on bitwise operations") (v5.13-rc4) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. The AND/OR issues were introduced by commit 3f50f132d840 ("bpf: Verifier, do explicit ALU32 bounds tracking") (5.7-rc1) and the XOR variant was introduced by 2921c90d4718 ("bpf:Fix a verifier failure with xor") ( 5.10-rc1).

Package Linux Kernel
Published 2021-06-04
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-20

CVE-2021-3490 is a Improper Input Validation vulnerability

What is Improper Input Validation?

The product receives input but does not validate it correctly, allowing attackers to craft inputs that cause unexpected behavior. Learn more on MITRE CWE

Affected versions

Linux kernel versions trunk, linux-5.12.y, linux-5.11.y, linux-5.10.y, v5.7-rc1 and later are affected. Fixed in v5.13-rc4, v5.12.4, v5.11.21, v5.10.37, 5.7* and their respective stable series.

Affected from
≥ trunk ≥ linux-5.12.y ≥ linux-5.11.y ≥ linux-5.10.y ≥ v5.7-rc1
Fixed in
✓ v5.13-rc4 ✓ v5.12.4 v5.12.x ✓ v5.11.21 v5.11.x ✓ v5.10.37 v5.10.x ✓ 5.7*

References

7 total
Showing 5 of 7 references View all on NVD

Frequently asked questions

  • What is CVE-2021-3490?

    CVE-2021-3490 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Improper Input Validation flaw (CWE-20) . It affects Linux kernel versions from trunk onward and has been patched in v5.13-rc4, v5.12.4, v5.11.21 and others. CVE-2021-3490 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2021-3490?

    CVE-2021-3490 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-2021-3490?

    Yes. CVE-2021-3490 has been patched. Fixed versions include v5.13-rc4, v5.12.4, v5.11.21 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-2021-3490 actively exploited?

    No. CVE-2021-3490 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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