What is CVE-2022-49556?

CVE-2022-49556 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10, affecting Linux kernel versions from 5.7 onward and patched in 5.10.124, 5.15.45, 5.17.13 and others. CVE-2022-49556 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2022-49556?

CVE-2022-49556 has a CVSS score of 7.1 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

Is there a patch available for CVE-2022-49556?

Yes, CVE-2022-49556 has been patched. Fixed versions include 5.10.124, 5.15.45, 5.17.13 and others. If you are running Linux kernel 5.7 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2022-49556 actively exploited?

CVE-2022-49556 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2022-49556

High

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak For some sev ioctl interfaces, the length parameter that is passed maybe less than or equal to SEV_FW_BLOB_MAX_SIZE, but larger than the data that PSP firmware returns. In this case, kmalloc will allocate memory that is the size of the input rather than the size of the data. Since PSP firmware doesn't fully overwrite the allocated buffer, these sev ioctl interface may return uninitialized kernel slab memory.

Package Linux Kernel

Published 2025-02-26

Last modified 2026-01-22

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.1

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Vector string

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

Affected versions

Linux kernel versions 5.7 and later are affected. Fixed in 5.10.124, 5.15.45, 5.17.13, 5.18.2, 5.19 and their respective stable series.

Affected from

≥ 5.7

Fixed in

✓ 5.10.124 5.10.x ✓ 5.15.45 5.15.x ✓ 5.17.13 5.17.x ✓ 5.18.2 5.18.x ✓ 5.19

References

The following references provide additional information about CVE-2022-49556 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/401bef1f95de92c3a8c6eece46e02fa88d7285ee
Patch
Kernel patch commit
https://git.kernel.org/stable/c/57a01725339f9d82b099102ba2751621b1caab93
Patch
Kernel patch commit
https://git.kernel.org/stable/c/bbdcc644b59e01e98c68894a9fab42b9687f42b0
Patch

5 patch commits total View all on NVD

Details

CVE ID CVE-2022-49556

Severity High

CVSS score 7.1 / 10

CVSS version 3.1

Published 2025-02-26

Modified 2026-01-22

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2022-49556?

CVE-2022-49556 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10 . It affects Linux kernel versions from 5.7 onward and has been patched in 5.10.124, 5.15.45, 5.17.13 and others. CVE-2022-49556 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2022-49556?

CVE-2022-49556 has a CVSS score of 7.1 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.
Is there a patch available for CVE-2022-49556?

Yes — CVE-2022-49556 has been patched. Fixed versions include 5.10.124, 5.15.45, 5.17.13 and others. If you are running Linux kernel 5.7 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2022-49556 actively exploited?

No — CVE-2022-49556 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.