What is CVE-2021-46928?

CVE-2021-46928 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 2.6.12 onward and patched in 5.10.90, 5.15.13 and 5.16. CVE-2021-46928 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-46928?

CVE-2021-46928 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-2021-46928?

Yes, CVE-2021-46928 has been patched. Fixed versions include 5.10.90, 5.15.13 and 5.16. If you are running Linux kernel 2.6.12 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-46928 actively exploited?

CVE-2021-46928 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-46928

Medium

In the Linux kernel, the following vulnerability has been resolved: parisc: Clear stale IIR value on instruction access rights trap When a trap 7 (Instruction access rights) occurs, this means the CPU couldn't execute an instruction due to missing execute permissions on the memory region. In this case it seems the CPU didn't even fetched the instruction from memory and thus did not store it in the cr19 (IIR) register before calling the trap handler. So, the trap handler will find some random old stale value in cr19. This patch simply overwrites the stale IIR value with a constant magic "bad food" value (0xbaadf00d), in the hope people don't start to try to understand the various random IIR values in trap 7 dumps.

Package Linux Kernel

Published 2024-02-27

Last modified 2024-11-21

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-755

CVE-2021-46928 is classified as CWE-755

See CWE-755 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 2.6.12 and later are affected. Fixed in 5.10.90, 5.15.13, 5.16 and their respective stable series.

Affected from

≥ 2.6.12

Fixed in

✓ 5.10.90 5.10.x ✓ 5.15.13 5.15.x ✓ 5.16

References

3 total

Kernel Git
https://git.kernel.org/stable/c/484730e5862f6b872dca13840bed40fd7c60fa26

Patch
Kernel Git
https://git.kernel.org/stable/c/d01e9ce1af6116f812491d3d3873d204f10ae0b8

Patch
Kernel Git
https://git.kernel.org/stable/c/e96373f0a5f484bc1e193f9951dcb3adf24bf3f7

Patch

Details

CVE ID CVE-2021-46928

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-02-27

Modified 2024-11-21

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-46928?

CVE-2021-46928 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 2.6.12 onward and has been patched in 5.10.90, 5.15.13 and 5.16. CVE-2021-46928 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-46928?

CVE-2021-46928 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-2021-46928?

Yes. CVE-2021-46928 has been patched. Fixed versions include 5.10.90, 5.15.13 and 5.16. If you are running Linux kernel 2.6.12 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-46928 actively exploited?

No. CVE-2021-46928 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.