What is CVE-2021-47429?

CVE-2021-47429 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 5.14 onward and patched in 5.14.12 and 5.15. CVE-2021-47429 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47429?

CVE-2021-47429 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-2021-47429?

Yes, CVE-2021-47429 has been patched. Fixed versions include 5.14.12 and 5.15. If you are running Linux kernel 5.14 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47429 actively exploited?

CVE-2021-47429 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-47429

Medium

In the Linux kernel, the following vulnerability has been resolved: powerpc/64s: Fix unrecoverable MCE calling async handler from NMI The machine check handler is not considered NMI on 64s. The early handler is the true NMI handler, and then it schedules the machine_check_exception handler to run when interrupts are enabled. This works fine except the case of an unrecoverable MCE, where the true NMI is taken when MSR[RI] is clear, it can not recover, so it calls machine_check_exception directly so something might be done about it. Calling an async handler from NMI context can result in irq state and other things getting corrupted. This can also trigger the BUG at arch/powerpc/include/asm/interrupt.h:168 BUG_ON(!arch_irq_disabled_regs(regs) && !(regs->msr & MSR_EE)); Fix this by making an _async version of the handler which is called in the normal case, and a NMI version that is called for unrecoverable interrupts.

Package Linux Kernel

Published 2024-05-21

Last modified 2025-09-25

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 5.14 and later are affected. Fixed in 5.14.12, 5.15 and their respective stable series.

Affected from

≥ 5.14

Fixed in

✓ 5.14.12 5.14.x ✓ 5.15

References

2 total

Kernel Git
https://git.kernel.org/stable/c/d7a8e38999fbd6910516e44cb43f9f4317e54f73

Patch
Kernel Git
https://git.kernel.org/stable/c/f08fb25bc66986b0952724530a640d9970fa52c1

Patch

Details

CVE ID CVE-2021-47429

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-05-21

Modified 2025-09-25

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47429?

CVE-2021-47429 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 5.14 onward and has been patched in 5.14.12 and 5.15. CVE-2021-47429 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47429?

CVE-2021-47429 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-2021-47429?

Yes. CVE-2021-47429 has been patched. Fixed versions include 5.14.12 and 5.15. If you are running Linux kernel 5.14 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47429 actively exploited?

No. CVE-2021-47429 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.