What is CVE-2021-46905?

CVE-2021-46905 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a NULL Pointer Dereference flaw (CWE-476), affecting Linux kernel versions from 4.19.187 onward and patched in 4.19.189, 5.4.115, 5.10.33 and others. CVE-2021-46905 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-46905?

CVE-2021-46905 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-2021-46905?

Yes, CVE-2021-46905 has been patched. Fixed versions include 4.19.189, 5.4.115, 5.10.33 and others. If you are running Linux kernel 4.19.187 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-46905 actively exploited?

CVE-2021-46905 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is NULL Pointer Dereference (CWE-476)?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/476.html

CVE-2021-46905

Medium

In the Linux kernel, the following vulnerability has been resolved: net: hso: fix NULL-deref on disconnect regression Commit 8a12f8836145 ("net: hso: fix null-ptr-deref during tty device unregistration") fixed the racy minor allocation reported by syzbot, but introduced an unconditional NULL-pointer dereference on every disconnect instead. Specifically, the serial device table must no longer be accessed after the minor has been released by hso_serial_tty_unregister().

Package Linux Kernel

Published 2024-02-26

Last modified 2024-11-21

CVSS version 3.1

Patch available

Yes

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-476

CVE-2021-46905 is a NULL Pointer Dereference vulnerability

What is NULL Pointer Dereference?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. Learn more on MITRE CWE

Affected versions

Linux kernel versions 4.19.187, 5.4.112, 5.10.30, 5.11.14, 5.12 and later are affected. Fixed in 4.19.189, 5.4.115, 5.10.33, 5.11.17, 5.12.1, 5.13 and their respective stable series.

Affected from

≥ 4.19.187 ≥ 5.4.112 ≥ 5.10.30 ≥ 5.11.14 ≥ 5.12

Fixed in

✓ 4.19.189 4.19.x ✓ 5.4.115 5.4.x ✓ 5.10.33 5.10.x ✓ 5.11.17 5.11.x ✓ 5.12.1 5.12.x ✓ 5.13

References

9 total

Kernel Git
https://git.kernel.org/stable/c/0c71d4c89559f72cec2592d078681a843bce570e

Patch
Kernel Git
https://git.kernel.org/stable/c/0f000005da31f6947f843ce6b3e3a960540c6e00

Patch
Kernel Git
https://git.kernel.org/stable/c/24b699bea7553fc0b98dad9d864befb6005ac7f1

Patch
Kernel Git
https://git.kernel.org/stable/c/2ad5692db72874f02b9ad551d26345437ea4f7f3

Patch
Kernel Git
https://git.kernel.org/stable/c/41c44e1f3112d7265dae522c026399b2a42d19ef

Patch

Showing 5 of 9 references View all on NVD

Details

CVE ID CVE-2021-46905

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-02-26

Modified 2024-11-21

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-46905?

CVE-2021-46905 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a NULL Pointer Dereference flaw (CWE-476) . It affects Linux kernel versions from 4.19.187 onward and has been patched in 4.19.189, 5.4.115, 5.10.33 and others. CVE-2021-46905 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-46905?

CVE-2021-46905 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-2021-46905?

Yes. CVE-2021-46905 has been patched. Fixed versions include 4.19.189, 5.4.115, 5.10.33 and others. If you are running Linux kernel 4.19.187 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-46905 actively exploited?

No. CVE-2021-46905 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.