What is CVE-2021-3489?

CVE-2021-3489 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Buffer Overflow flaw (CWE-119), affecting Linux kernel versions from trunk onward and patched in v5.13-rc4, v5.12.4, v5.11.21 and others. CVE-2021-3489 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-3489?

CVE-2021-3489 has a CVSS score of 7.8 out of 10, rated High severity. 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-2021-3489?

Yes, CVE-2021-3489 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-2021-3489 actively exploited?

CVE-2021-3489 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Buffer Overflow (CWE-119)?

The product performs operations on a memory buffer but reads or writes outside its intended boundaries. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/119.html

CVE-2021-3489

High

The eBPF RINGBUF bpf_ringbuf_reserve() function in the Linux kernel did not check that the allocated size was smaller than the ringbuf size, allowing an attacker to perform out-of-bounds writes within the kernel and therefore, arbitrary code execution. This issue was fixed via commit 4b81ccebaeee ("bpf, ringbuf: Deny reserve of buffers larger than ringbuf") (v5.13-rc4) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was introduced via 457f44363a88 ("bpf: Implement BPF ring buffer and verifier support for it") (v5.8-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-119

CVE-2021-3489 is a Buffer Overflow vulnerability

What is Buffer Overflow?

The product performs operations on a memory buffer but reads or writes outside its intended boundaries. Learn more on MITRE CWE

Affected versions

Linux kernel versions trunk, linux-5.12.y, linux-5.11.y, linux-5.10.y, v5.8 and later are affected. Fixed in v5.13-rc4, v5.12.4, v5.11.21, v5.10.37, 5.8* and their respective stable series.

Affected from

≥ trunk ≥ linux-5.12.y ≥ linux-5.11.y ≥ linux-5.10.y ≥ v5.8

Fixed in

✓ v5.13-rc4 ✓ v5.12.4 v5.12.x ✓ v5.11.21 v5.11.x ✓ v5.10.37 v5.10.x ✓ 5.8*

References

6 total

Kernel Git
https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=4b81ccebaeee885ab1aa1438133f2991e3a2b6ea

Patch Vendor Advisory
Security
https://security.netapp.com/advisory/ntap-20210716-0004/

Third Party Advisory
Ubuntu Security
https://ubuntu.com/security/notices/USN-4949-1

Third Party Advisory
Ubuntu Security
https://ubuntu.com/security/notices/USN-4950-1

Third Party Advisory
Openwall
https://www.openwall.com/lists/oss-security/2021/05/11/10

Mailing List Third Party Advisory

Showing 5 of 6 references View all on NVD

Details

CVE ID CVE-2021-3489

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2021-06-04

Modified 2024-11-21

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-3489?

CVE-2021-3489 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as a Buffer Overflow flaw (CWE-119) . 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-2021-3489 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-3489?

CVE-2021-3489 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-2021-3489?

Yes. CVE-2021-3489 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-2021-3489 actively exploited?

No. CVE-2021-3489 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.