What is CVE-2021-47412?

CVE-2021-47412 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 4.19 onward and patched in 5.10.241, 5.14.11 and 5.15. CVE-2021-47412 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47412?

CVE-2021-47412 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-2021-47412?

Yes, CVE-2021-47412 has been patched. Fixed versions include 5.10.241, 5.14.11 and 5.15. If you are running Linux kernel 4.19 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47412 actively exploited?

CVE-2021-47412 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-47412

Medium

In the Linux kernel, the following vulnerability has been resolved: block: don't call rq_qos_ops->done_bio if the bio isn't tracked rq_qos framework is only applied on request based driver, so: 1) rq_qos_done_bio() needn't to be called for bio based driver 2) rq_qos_done_bio() needn't to be called for bio which isn't tracked, such as bios ended from error handling code. Especially in bio_endio(): 1) request queue is referred via bio->bi_bdev->bd_disk->queue, which may be gone since request queue refcount may not be held in above two cases 2) q->rq_qos may be freed in blk_cleanup_queue() when calling into __rq_qos_done_bio() Fix the potential kernel panic by not calling rq_qos_ops->done_bio if the bio isn't tracked. This way is safe because both ioc_rqos_done_bio() and blkcg_iolatency_done_bio() are nop if the bio isn't tracked.

Package Linux Kernel

Published 2024-05-21

Last modified 2025-11-03

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

Affected versions

Linux kernel versions 4.19 and later are affected. Fixed in 5.10.241, 5.14.11, 5.15 and their respective stable series.

Affected from

≥ 4.19

Fixed in

✓ 5.10.241 5.10.x ✓ 5.14.11 5.14.x ✓ 5.15

References

4 total

Kernel Git
https://git.kernel.org/stable/c/004b8f8a691205a93d9e80d98b786b2b97424d6e

Patch
Kernel Git
https://git.kernel.org/stable/c/a647a524a46736786c95cdb553a070322ca096e3

Patch
Kernel Git
https://git.kernel.org/stable/c/db60edbfff332a6a5477c367af8125f034570989

Patch
Debian Security
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html

Details

CVE ID CVE-2021-47412

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-05-21

Modified 2025-11-03

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47412?

CVE-2021-47412 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 4.19 onward and has been patched in 5.10.241, 5.14.11 and 5.15. CVE-2021-47412 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47412?

CVE-2021-47412 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-2021-47412?

Yes. CVE-2021-47412 has been patched. Fixed versions include 5.10.241, 5.14.11 and 5.15. If you are running Linux kernel 4.19 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47412 actively exploited?

No. CVE-2021-47412 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.