What is CVE-2025-21950?

CVE-2025-21950 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10, affecting Linux kernel versions from 5.12 onward and patched in 5.15.179, 6.1.131, 6.6.83 and others. CVE-2025-21950 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-21950?

CVE-2025-21950 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-2025-21950?

Yes, CVE-2025-21950 has been patched. Fixed versions include 5.15.179, 6.1.131, 6.6.83 and others. 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-2025-21950 actively exploited?

CVE-2025-21950 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-21950

High

In the Linux kernel, the following vulnerability has been resolved: drivers: virt: acrn: hsm: Use kzalloc to avoid info leak in pmcmd_ioctl In the "pmcmd_ioctl" function, three memory objects allocated by kmalloc are initialized by "hcall_get_cpu_state", which are then copied to user space. The initializer is indeed implemented in "acrn_hypercall2" (arch/x86/include/asm/acrn.h). There is a risk of information leakage due to uninitialized bytes.

Package Linux Kernel

Published 2025-04-01

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 5.12 and later are affected. Fixed in 5.15.179, 6.1.131, 6.6.83, 6.12.19, 6.13.7, 6.14 and their respective stable series.

Affected from

≥ 5.12

Fixed in

✓ 5.15.179 5.15.x ✓ 6.1.131 6.1.x ✓ 6.6.83 6.6.x ✓ 6.12.19 6.12.x ✓ 6.13.7 6.13.x ✓ 6.14

References

The following references provide additional information about CVE-2025-21950 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Debian Security
https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html

Third Party Advisory
Kernel patch commit
https://git.kernel.org/stable/c/1b8f7a2caa7f9cdfd135e3f78eb9d7e36fb95083
Patch
Kernel patch commit
https://git.kernel.org/stable/c/4e15cf870d2c748e45d45ffc4d5b1dc1b7d50120
Patch
Kernel patch commit
https://git.kernel.org/stable/c/524f29d78c9bdeb49f31f5b0376a07d2fc5cf563
Patch

6 patch commits total View all on NVD

Details

CVE ID CVE-2025-21950

Severity High

CVSS score 7.1 / 10

CVSS version 3.1

Published 2025-04-01

Modified 2026-01-22

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-21950?

CVE-2025-21950 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10 . It affects Linux kernel versions from 5.12 onward and has been patched in 5.15.179, 6.1.131, 6.6.83 and others. CVE-2025-21950 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-21950?

CVE-2025-21950 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-2025-21950?

Yes — CVE-2025-21950 has been patched. Fixed versions include 5.15.179, 6.1.131, 6.6.83 and others. 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-2025-21950 actively exploited?

No — CVE-2025-21950 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.