What is CVE-2025-71155?

CVE-2025-71155 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Out-of-bounds Write flaw (CWE-787), affecting Linux kernel versions from 6.17.4 onward and patched in 6.18.4 and 6.19. CVE-2025-71155 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-71155?

CVE-2025-71155 has a CVSS score of 7.8 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:H/A:H.

Is there a patch available for CVE-2025-71155?

Yes, CVE-2025-71155 has been patched. Fixed versions include 6.18.4 and 6.19. If you are running Linux kernel 6.17.4 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-71155 actively exploited?

CVE-2025-71155 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Write (CWE-787)?

The product writes data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/787.html

CVE-2025-71155

High

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix gmap_helper_zap_one_page() again A few checks were missing in gmap_helper_zap_one_page(), which can lead to memory corruption in the guest under specific circumstances. Add the missing checks.

Package Linux Kernel

Published 2026-01-23

Last modified 2026-02-26

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-787

CVE-2025-71155 is a Out-of-bounds Write vulnerability

What is Out-of-bounds Write?

The product writes data past the end or before the beginning of the intended buffer. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.17.4, 6.18 and later are affected. Fixed in 6.18.4, 6.19 and their respective stable series.

Affected from

≥ 6.17.4 ≥ 6.18

Fixed in

✓ 6.18.4 6.18.x ✓ 6.19

References

The following references provide additional information about CVE-2025-71155 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/2af2abbcbf8573100288e8f8aea2dab8a2a0ceb7
Patch
Kernel patch commit
https://git.kernel.org/stable/c/2f393c228cc519ddf19b8c6c05bf15723241aa96
Patch

Details

CVE ID CVE-2025-71155

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-01-23

Modified 2026-02-26

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-71155?

CVE-2025-71155 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Out-of-bounds Write flaw (CWE-787) . It affects Linux kernel versions from 6.17.4 onward and has been patched in 6.18.4 and 6.19. CVE-2025-71155 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-71155?

CVE-2025-71155 has a CVSS score of 7.8 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:H/A:H.
Is there a patch available for CVE-2025-71155?

Yes — CVE-2025-71155 has been patched. Fixed versions include 6.18.4 and 6.19. If you are running Linux kernel 6.17.4 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-71155 actively exploited?

No — CVE-2025-71155 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Out-of-bounds Write (CWE-787)?

The product writes data past the end or before the beginning of the intended buffer. View CWE-787 on MITRE CWE →