What is CVE-2021-47317?

CVE-2021-47317 is a Low severity Linux kernel vulnerability with a CVSS score of 3.3 out of 10, classified as a Improper Locking flaw (CWE-667), affecting Linux kernel versions from 5.12 onward and patched in 5.12.19, 5.13.4 and 5.14. CVE-2021-47317 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47317?

CVE-2021-47317 has a CVSS score of 3.3 out of 10, rated Low severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.

Is there a patch available for CVE-2021-47317?

Yes, CVE-2021-47317 has been patched. Fixed versions include 5.12.19, 5.13.4 and 5.14. If you are running Linux kernel 5.12 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47317 actively exploited?

CVE-2021-47317 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Improper Locking (CWE-667)?

The product does not properly acquire or release a lock, which can lead to unexpected behaviour. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/667.html

CVE-2021-47317

Low

In the Linux kernel, the following vulnerability has been resolved: powerpc/bpf: Fix detecting BPF atomic instructions Commit 91c960b0056672 ("bpf: Rename BPF_XADD and prepare to encode other atomics in .imm") converted BPF_XADD to BPF_ATOMIC and added a way to distinguish instructions based on the immediate field. Existing JIT implementations were updated to check for the immediate field and to reject programs utilizing anything more than BPF_ADD (such as BPF_FETCH) in the immediate field. However, the check added to powerpc64 JIT did not look at the correct BPF instruction. Due to this, such programs would be accepted and incorrectly JIT'ed resulting in soft lockups, as seen with the atomic bounds test. Fix this by looking at the correct immediate value.

Package Linux Kernel

Published 2024-05-21

Last modified 2025-05-12

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

3.3

out of 10

Low

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

Low

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Weakness type

CWE-667

CVE-2021-47317 is a Improper Locking vulnerability

What is Improper Locking?

The product does not properly acquire or release a lock, which can lead to unexpected behaviour. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.12 and later are affected. Fixed in 5.12.19, 5.13.4, 5.14 and their respective stable series.

Affected from

≥ 5.12

Fixed in

✓ 5.12.19 5.12.x ✓ 5.13.4 5.13.x ✓ 5.14

References

3 total

Kernel Git
https://git.kernel.org/stable/c/0d435b6d94b05dcfd836d758a63145aa566618e2

Patch
Kernel Git
https://git.kernel.org/stable/c/419ac821766cbdb9fd85872bb3f1a589df05c94c

Patch
Kernel Git
https://git.kernel.org/stable/c/7284dab07e4d51d453cc42851fae9ec4fac6ef2f

Patch

Details

CVE ID CVE-2021-47317

Severity Low

CVSS score 3.3 / 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-2021-47317?

CVE-2021-47317 is a Low severity Linux kernel vulnerability with a CVSS score of 3.3 out of 10 , classified as an Improper Locking flaw (CWE-667) . It affects Linux kernel versions from 5.12 onward and has been patched in 5.12.19, 5.13.4 and 5.14. CVE-2021-47317 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47317?

CVE-2021-47317 has a CVSS score of 3.3 out of 10, rated Low 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:L.
Is there a patch available for CVE-2021-47317?

Yes. CVE-2021-47317 has been patched. Fixed versions include 5.12.19, 5.13.4 and 5.14. If you are running Linux kernel 5.12 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47317 actively exploited?

No. CVE-2021-47317 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.