What is CVE-2021-47541?

CVE-2021-47541 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 4.7 onward and patched in 4.14.257, 4.19.220, 5.4.164 and others. CVE-2021-47541 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47541?

CVE-2021-47541 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-2021-47541?

Yes, CVE-2021-47541 has been patched. Fixed versions include 4.14.257, 4.19.220, 5.4.164 and others. If you are running Linux kernel 4.7 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47541 actively exploited?

CVE-2021-47541 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-2021-47541

High

In the Linux kernel, the following vulnerability has been resolved: net/mlx4_en: Fix an use-after-free bug in mlx4_en_try_alloc_resources() In mlx4_en_try_alloc_resources(), mlx4_en_copy_priv() is called and tmp->tx_cq will be freed on the error path of mlx4_en_copy_priv(). After that mlx4_en_alloc_resources() is called and there is a dereference of &tmp->tx_cq[t][i] in mlx4_en_alloc_resources(), which could lead to a use after free problem on failure of mlx4_en_copy_priv(). Fix this bug by adding a check of mlx4_en_copy_priv() This bug was found by a static analyzer. The analysis employs differential checking to identify inconsistent security operations (e.g., checks or kfrees) between two code paths and confirms that the inconsistent operations are not recovered in the current function or the callers, so they constitute bugs. Note that, as a bug found by static analysis, it can be a false positive or hard to trigger. Multiple researchers have cross-reviewed the bug. Builds with CONFIG_MLX4_EN=m show no new warnings, and our static analyzer no longer warns about this code.

Package Linux Kernel

Published 2024-05-24

Last modified 2024-11-21

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-2021-47541 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 4.7 and later are affected. Fixed in 4.14.257, 4.19.220, 5.4.164, 5.10.84, 5.15.7, 5.16 and their respective stable series.

Affected from

≥ 4.7

Fixed in

✓ 4.14.257 4.14.x ✓ 4.19.220 4.19.x ✓ 5.4.164 5.4.x ✓ 5.10.84 5.10.x ✓ 5.15.7 5.15.x ✓ 5.16

References

6 total

Kernel Git
https://git.kernel.org/stable/c/676dc7d9b15bf8733233a2db1ec3f9091ab34275

Patch
Kernel Git
https://git.kernel.org/stable/c/75917372eef0dbfb290ae45474314d35f97aea18

Patch
Kernel Git
https://git.kernel.org/stable/c/addad7643142f500080417dd7272f49b7a185570

Patch
Kernel Git
https://git.kernel.org/stable/c/be12572c5ddc8ad7453bada4eec8fa46967dc757

Patch
Kernel Git
https://git.kernel.org/stable/c/e461a9816a1ac5b4aeb61621b817225b61e46a68

Patch

Showing 5 of 6 references View all on NVD

Details

CVE ID CVE-2021-47541

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2024-05-24

Modified 2024-11-21

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47541?

CVE-2021-47541 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 4.7 onward and has been patched in 4.14.257, 4.19.220, 5.4.164 and others. CVE-2021-47541 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47541?

CVE-2021-47541 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-2021-47541?

Yes. CVE-2021-47541 has been patched. Fixed versions include 4.14.257, 4.19.220, 5.4.164 and others. If you are running Linux kernel 4.7 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47541 actively exploited?

No. CVE-2021-47541 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.