What is CVE-2021-43389?

CVE-2021-43389 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Out-of-bounds Read flaw (CWE-125). CVE-2021-43389 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-43389?

CVE-2021-43389 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2021-43389?

No patch is currently available for CVE-2021-43389. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-43389 actively exploited?

CVE-2021-43389 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Read (CWE-125)?

The product reads data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/125.html

CVE-2021-43389

Medium

An issue was discovered in the Linux kernel before 5.14.15. There is an array-index-out-of-bounds flaw in the detach_capi_ctr function in drivers/isdn/capi/kcapi.c.

Package Linux Kernel

Published 2021-11-04

Last modified 2024-11-21

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness type

CWE-125

CVE-2021-43389 is a Out-of-bounds Read vulnerability

What is Out-of-bounds Read?

The product reads data past the end or before the beginning of the intended buffer. Learn more on MITRE CWE

References

The following references provide additional information about CVE-2021-43389 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Openwall
http://www.openwall.com/lists/oss-security/2021/11/05/1

Mailing List Third Party Advisory
Kernel.org
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.15

Mailing List Release Notes Third Party Advisory
Debian Security
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html

Mailing List Third Party Advisory
Debian Security
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html

Mailing List Third Party Advisory
Kernel.org
https://lore.kernel.org/netdev/CAFcO6XOvGQrRTaTkaJ0p3zR7y7nrAWD79r48=L_BbOyrK9X-vA%40mail.gmail.com/
Seclists
https://seclists.org/oss-sec/2021/q4/39

Exploit Mailing List Third Party Advisory
Debian Security
https://www.debian.org/security/2022/dsa-5096

Third Party Advisory
Kernel patch commit
https://bugzilla.redhat.com/show_bug.cgi?id=2013180
Patch
Kernel patch commit
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1f3e2e97c003f80c4b087092b225c8787ff91e4d
Patch
Kernel patch commit
https://www.oracle.com/security-alerts/cpujul2022.html
Patch

Details

CVE ID CVE-2021-43389

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2021-11-04

Modified 2024-11-21

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-43389?

CVE-2021-43389 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as an Out-of-bounds Read flaw (CWE-125) . CVE-2021-43389 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-43389?

CVE-2021-43389 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2021-43389?

No patch is currently available for CVE-2021-43389. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-43389 actively exploited?

No — CVE-2021-43389 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Out-of-bounds Read (CWE-125)?

The product reads data past the end or before the beginning of the intended buffer. View CWE-125 on MITRE CWE →