What is CVE-2021-42739?

CVE-2021-42739 is a Medium severity Linux kernel vulnerability with a CVSS score of 6.7 out of 10, classified as a Out-of-bounds Write flaw (CWE-787). CVE-2021-42739 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-42739?

CVE-2021-42739 has a CVSS score of 6.7 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2021-42739?

No patch is currently available for CVE-2021-42739. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-42739 actively exploited?

CVE-2021-42739 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Write (CWE-787)?

The product writes data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/787.html

CVE-2021-42739

Medium

The firewire subsystem in the Linux kernel through 5.14.13 has a buffer overflow related to drivers/media/firewire/firedtv-avc.c and drivers/media/firewire/firedtv-ci.c, because avc_ca_pmt mishandles bounds checking.

Package Linux Kernel

Published 2021-10-20

Last modified 2024-11-21

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

6.7

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-787

CVE-2021-42739 is a Out-of-bounds Write vulnerability

What is Out-of-bounds Write?

The product writes 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-2021-42739 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Red Hat
https://bugzilla.redhat.com/show_bug.cgi?id=1951739

Issue Tracking Mitigation Third Party Advisory
Kernel.org
https://lore.kernel.org/linux-media/YHaulytonFcW+lyZ%40mwanda/
Seclists
https://seclists.org/oss-sec/2021/q2/46
Starwindsoftware
https://www.starwindsoftware.com/security/sw-20220804-0001/

Third Party Advisory
Kernel patch commit
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=35d2969ea3c7d32aee78066b1f3cf61a0d935a4e
Patch
Kernel patch commit
https://www.oracle.com/security-alerts/cpujul2022.html
Patch

Details

CVE ID CVE-2021-42739

Severity Medium

CVSS score 6.7 / 10

CVSS version 3.1

Published 2021-10-20

Modified 2024-11-21

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-42739?

CVE-2021-42739 is a Medium severity Linux kernel vulnerability with a CVSS score of 6.7 out of 10 , classified as an Out-of-bounds Write flaw (CWE-787) . CVE-2021-42739 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-42739?

CVE-2021-42739 has a CVSS score of 6.7 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2021-42739?

No patch is currently available for CVE-2021-42739. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-42739 actively exploited?

No — CVE-2021-42739 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Out-of-bounds Write (CWE-787)?

The product writes data past the end or before the beginning of the intended buffer. View CWE-787 on MITRE CWE →