What is CVE-2021-46998?

CVE-2021-46998 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Use After Free flaw (CWE-416), affecting Linux kernel versions from 4.16 onward and patched in 4.19.191, 5.4.120, 5.10.38 and others. CVE-2021-46998 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-46998?

CVE-2021-46998 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-2021-46998?

Yes, CVE-2021-46998 has been patched. Fixed versions include 4.19.191, 5.4.120, 5.10.38 and others. If you are running Linux kernel 4.16 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-46998 actively exploited?

CVE-2021-46998 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/416.html

CVE-2021-46998

High

In the Linux kernel, the following vulnerability has been resolved: ethernet:enic: Fix a use after free bug in enic_hard_start_xmit In enic_hard_start_xmit, it calls enic_queue_wq_skb(). Inside enic_queue_wq_skb, if some error happens, the skb will be freed by dev_kfree_skb(skb). But the freed skb is still used in skb_tx_timestamp(skb). My patch makes enic_queue_wq_skb() return error and goto spin_unlock() incase of error. The solution is provided by Govind. See https://lkml.org/lkml/2021/4/30/961.

Package Linux Kernel

Published 2024-02-28

Last modified 2024-12-06

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-416

CVE-2021-46998 is a Use After Free vulnerability

What is Use After Free?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. Learn more on MITRE CWE

Affected versions

Linux kernel versions 4.16 and later are affected. Fixed in 4.19.191, 5.4.120, 5.10.38, 5.11.22, 5.12.5, 5.13 and their respective stable series.

Affected from

≥ 4.16

Fixed in

✓ 4.19.191 4.19.x ✓ 5.4.120 5.4.x ✓ 5.10.38 5.10.x ✓ 5.11.22 5.11.x ✓ 5.12.5 5.12.x ✓ 5.13

References

6 total

Kernel Git
https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976

Patch
Kernel Git
https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3

Patch
Kernel Git
https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3

Patch
Kernel Git
https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1

Patch
Kernel Git
https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24

Patch

Showing 5 of 6 references View all on NVD

Details

CVE ID CVE-2021-46998

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2024-02-28

Modified 2024-12-06

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-46998?

CVE-2021-46998 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Use After Free flaw (CWE-416) . It affects Linux kernel versions from 4.16 onward and has been patched in 4.19.191, 5.4.120, 5.10.38 and others. CVE-2021-46998 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-46998?

CVE-2021-46998 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-2021-46998?

Yes. CVE-2021-46998 has been patched. Fixed versions include 4.19.191, 5.4.120, 5.10.38 and others. If you are running Linux kernel 4.16 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-46998 actively exploited?

No. CVE-2021-46998 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.