What is CVE-2021-47342?

CVE-2021-47342 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 5.12.18 onward and patched in 5.13 and 5.10.77. CVE-2021-47342 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47342?

CVE-2021-47342 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-2021-47342?

Yes, CVE-2021-47342 has been patched. Fixed versions include 5.13 and 5.10.77. If you are running Linux kernel 5.12.18 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47342 actively exploited?

CVE-2021-47342 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-2021-47342

High

In the Linux kernel, the following vulnerability has been resolved: ext4: fix possible UAF when remounting r/o a mmp-protected file system After commit 618f003199c6 ("ext4: fix memory leak in ext4_fill_super"), after the file system is remounted read-only, there is a race where the kmmpd thread can exit, causing sbi->s_mmp_tsk to point at freed memory, which the call to ext4_stop_mmpd() can trip over. Fix this by only allowing kmmpd() to exit when it is stopped via ext4_stop_mmpd(). Bug-Report-Link: <[email protected]>

Package Linux Kernel

Published 2024-05-21

Last modified 2024-12-26

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-2021-47342 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 5.12.18, 5.10.51 and later are affected. Fixed in 5.13, 5.10.77 and their respective stable series.

Affected from

≥ 5.12.18 ≥ 5.10.51

Fixed in

✓ 5.13 5.13.x ✓ 5.10.77 5.10.x

References

3 total

Kernel Git
https://git.kernel.org/stable/c/61bb4a1c417e5b95d9edb4f887f131de32e419cb

Patch
Kernel Git
https://git.kernel.org/stable/c/7ed572cdf11081f8f9e07abd4bea56a3f2c4edbd

Patch
Kernel Git
https://git.kernel.org/stable/c/b663890d854403e566169f7e90aed5cd6ff64f6b

Patch

Details

CVE ID CVE-2021-47342

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2024-05-21

Modified 2024-12-26

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47342?

CVE-2021-47342 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 5.12.18 onward and has been patched in 5.13 and 5.10.77. CVE-2021-47342 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47342?

CVE-2021-47342 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-2021-47342?

Yes. CVE-2021-47342 has been patched. Fixed versions include 5.13 and 5.10.77. If you are running Linux kernel 5.12.18 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47342 actively exploited?

No. CVE-2021-47342 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.