What is CVE-2021-47305?

CVE-2021-47305 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 4.9 onward and patched in 4.14.241, 4.19.199, 5.4.135 and others. CVE-2021-47305 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47305?

CVE-2021-47305 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-2021-47305?

Yes, CVE-2021-47305 has been patched. Fixed versions include 4.14.241, 4.19.199, 5.4.135 and others. If you are running Linux kernel 4.9 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47305 actively exploited?

CVE-2021-47305 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-47305

Medium

In the Linux kernel, the following vulnerability has been resolved: dma-buf/sync_file: Don't leak fences on merge failure Each add_fence() call does a dma_fence_get() on the relevant fence. In the error path, we weren't calling dma_fence_put() so all those fences got leaked. Also, in the krealloc_array failure case, we weren't freeing the fences array. Instead, ensure that i and fences are always zero-initialized and dma_fence_put() all the fences and kfree(fences) on every error path.

Package Linux Kernel

Published 2024-05-21

Last modified 2025-05-12

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-617

CVE-2021-47305 is classified as CWE-617

See CWE-617 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 4.9 and later are affected. Fixed in 4.14.241, 4.19.199, 5.4.135, 5.10.53, 5.13.5, 5.14 and their respective stable series.

Affected from

≥ 4.9

Fixed in

✓ 4.14.241 4.14.x ✓ 4.19.199 4.19.x ✓ 5.4.135 5.4.x ✓ 5.10.53 5.10.x ✓ 5.13.5 5.13.x ✓ 5.14

References

6 total

Kernel Git
https://git.kernel.org/stable/c/0d514185ae792d3a1903c8e1a83899aa996705ce

Patch
Kernel Git
https://git.kernel.org/stable/c/19edcd97727aae9362444a859a24d99a8730cb27

Patch
Kernel Git
https://git.kernel.org/stable/c/19f51c2529339280d2c8c6427cd3e21ddf1ac3f8

Patch
Kernel Git
https://git.kernel.org/stable/c/41f45e91c92c8480242ea448d54e28c753b13902

Patch
Kernel Git
https://git.kernel.org/stable/c/e0355a0ad31a1d677b2a4514206de4902bd550e8

Patch

Showing 5 of 6 references View all on NVD

Details

CVE ID CVE-2021-47305

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-05-21

Modified 2025-05-12

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47305?

CVE-2021-47305 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 4.9 onward and has been patched in 4.14.241, 4.19.199, 5.4.135 and others. CVE-2021-47305 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47305?

CVE-2021-47305 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-2021-47305?

Yes. CVE-2021-47305 has been patched. Fixed versions include 4.14.241, 4.19.199, 5.4.135 and others. If you are running Linux kernel 4.9 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47305 actively exploited?

No. CVE-2021-47305 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.