What is CVE-2026-23156?

CVE-2026-23156 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 6.0 onward and patched in 6.1.162, 6.6.123, 6.12.69 and others. CVE-2026-23156 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-23156?

CVE-2026-23156 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-2026-23156?

Yes, CVE-2026-23156 has been patched. Fixed versions include 6.1.162, 6.6.123, 6.12.69 and others. If you are running Linux kernel 6.0 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-23156 actively exploited?

CVE-2026-23156 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-23156

High

In the Linux kernel, the following vulnerability has been resolved: efivarfs: fix error propagation in efivar_entry_get() efivar_entry_get() always returns success even if the underlying __efivar_entry_get() fails, masking errors. This may result in uninitialized heap memory being copied to userspace in the efivarfs_file_read() path. Fix it by returning the error from __efivar_entry_get().

Package Linux Kernel

Published 2026-02-14

Last modified 2026-03-18

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

Affected versions

Linux kernel versions 6.0 and later are affected. Fixed in 6.1.162, 6.6.123, 6.12.69, 6.18.9, 6.19 and their respective stable series.

Affected from

≥ 6.0

Fixed in

✓ 6.1.162 6.1.x ✓ 6.6.123 6.6.x ✓ 6.12.69 6.12.x ✓ 6.18.9 6.18.x ✓ 6.19

References

The following references provide additional information about CVE-2026-23156 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/3960f1754664661a970dc9ebbab44ff93a0b4c42
Patch
Kernel patch commit
https://git.kernel.org/stable/c/4b22ec1685ce1fc0d862dcda3225d852fb107995
Patch
Kernel patch commit
https://git.kernel.org/stable/c/510a16f1c5c1690b33504052bc13fbc2772c23f8
Patch

5 patch commits total View all on NVD

Details

CVE ID CVE-2026-23156

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-02-14

Modified 2026-03-18

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-23156?

CVE-2026-23156 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 6.0 onward and has been patched in 6.1.162, 6.6.123, 6.12.69 and others. CVE-2026-23156 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-23156?

CVE-2026-23156 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-2026-23156?

Yes — CVE-2026-23156 has been patched. Fixed versions include 6.1.162, 6.6.123, 6.12.69 and others. If you are running Linux kernel 6.0 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-23156 actively exploited?

No — CVE-2026-23156 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.