What is CVE-2026-23256?

CVE-2026-23256 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 4.10 onward and patched in 5.10.250, 5.15.200, 6.1.163 and others. CVE-2026-23256 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-23256?

CVE-2026-23256 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-2026-23256?

Yes, CVE-2026-23256 has been patched. Fixed versions include 5.10.250, 5.15.200, 6.1.163 and others. If you are running Linux kernel 4.10 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-23256 actively exploited?

CVE-2026-23256 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-23256

Medium

In the Linux kernel, the following vulnerability has been resolved: net: liquidio: Fix off-by-one error in VF setup_nic_devices() cleanup In setup_nic_devices(), the initialization loop jumps to the label setup_nic_dev_free on failure. The current cleanup loop while(i--) skip the failing index i, causing a memory leak. Fix this by changing the loop to iterate from the current index i down to 0. Compile tested only. Issue found using code review.

Package Linux Kernel

Published 2026-03-18

Last modified 2026-05-21

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

Weakness type

CWE-193

CVE-2026-23256 is classified as CWE-193

See CWE-193 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 4.10 and later are affected. Fixed in 5.10.250, 5.15.200, 6.1.163, 6.6.124, 6.12.70, 6.18.10, 6.19 and their respective stable series.

Affected from

≥ 4.10

Fixed in

✓ 5.10.250 5.10.x ✓ 5.15.200 5.15.x ✓ 6.1.163 6.1.x ✓ 6.6.124 6.6.x ✓ 6.12.70 6.12.x ✓ 6.18.10 6.18.x ✓ 6.19

References

The following references provide additional information about CVE-2026-23256 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/01fbca1e93ec3f39f76c31a8f9afa32ce00da48a
Patch
Kernel patch commit
https://git.kernel.org/stable/c/3bf519e39b51cb08a93c0599870b35a23db1031e
Patch
Kernel patch commit
https://git.kernel.org/stable/c/4640fa5ad5e1a0dbd1c2d22323b7d70a8107dcfd
Patch

7 patch commits total View all on NVD

Details

CVE ID CVE-2026-23256

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-03-18

Modified 2026-05-21

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-23256?

CVE-2026-23256 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 4.10 onward and has been patched in 5.10.250, 5.15.200, 6.1.163 and others. CVE-2026-23256 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-23256?

CVE-2026-23256 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-2026-23256?

Yes — CVE-2026-23256 has been patched. Fixed versions include 5.10.250, 5.15.200, 6.1.163 and others. If you are running Linux kernel 4.10 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-23256 actively exploited?

No — CVE-2026-23256 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.