What is CVE-2022-49562?

CVE-2022-49562 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 5.2 onward and patched in 5.17.13, 5.18.2 and 5.19. CVE-2022-49562 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2022-49562?

CVE-2022-49562 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-2022-49562?

Yes, CVE-2022-49562 has been patched. Fixed versions include 5.17.13, 5.18.2 and 5.19. If you are running Linux kernel 5.2 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2022-49562 actively exploited?

CVE-2022-49562 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2022-49562

Medium

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits Use the recently introduced __try_cmpxchg_user() to update guest PTE A/D bits instead of mapping the PTE into kernel address space. The VM_PFNMAP path is broken as it assumes that vm_pgoff is the base pfn of the mapped VMA range, which is conceptually wrong as vm_pgoff is the offset relative to the file and has nothing to do with the pfn. The horrific hack worked for the original use case (backing guest memory with /dev/mem), but leads to accessing "random" pfns for pretty much any other VM_PFNMAP case.

Package Linux Kernel

Published 2025-02-26

Last modified 2025-10-22

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 5.2 and later are affected. Fixed in 5.17.13, 5.18.2, 5.19 and their respective stable series.

Affected from

≥ 5.2

Fixed in

✓ 5.17.13 5.17.x ✓ 5.18.2 5.18.x ✓ 5.19

References

The following references provide additional information about CVE-2022-49562 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/38b888911e8dc89b89d8147cfb1d2dbe6373bf78
Patch
Kernel patch commit
https://git.kernel.org/stable/c/8089e5e1d18402fb8152d6b6815450a36fffa9b0
Patch
Kernel patch commit
https://git.kernel.org/stable/c/f122dfe4476890d60b8c679128cd2259ec96a24c
Patch

Details

CVE ID CVE-2022-49562

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-02-26

Modified 2025-10-22

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2022-49562?

CVE-2022-49562 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 5.2 onward and has been patched in 5.17.13, 5.18.2 and 5.19. CVE-2022-49562 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2022-49562?

CVE-2022-49562 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-2022-49562?

Yes — CVE-2022-49562 has been patched. Fixed versions include 5.17.13, 5.18.2 and 5.19. If you are running Linux kernel 5.2 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2022-49562 actively exploited?

No — CVE-2022-49562 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.