What is CVE-2026-23226?

CVE-2026-23226 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Use After Free flaw (CWE-416), affecting Linux kernel versions from 5.15.145 onward and patched in 6.12.77, 6.18.11, 6.19.1 and others. CVE-2026-23226 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-23226?

CVE-2026-23226 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-2026-23226?

Yes, CVE-2026-23226 has been patched. Fixed versions include 6.12.77, 6.18.11, 6.19.1 and others. If you are running Linux kernel 5.15.145 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-23226 actively exploited?

CVE-2026-23226 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/416.html

CVE-2026-23226

High

In the Linux kernel, the following vulnerability has been resolved: ksmbd: add chann_lock to protect ksmbd_chann_list xarray ksmbd_chann_list xarray lacks synchronization, allowing use-after-free in multi-channel sessions (between lookup_chann_list() and ksmbd_chann_del). Adds rw_semaphore chann_lock to struct ksmbd_session and protects all xa_load/xa_store/xa_erase accesses.

Package Linux Kernel

Published 2026-02-18

Last modified 2026-04-02

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-416

CVE-2026-23226 is a Use After Free vulnerability

What is Use After Free?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.15.145, 6.1.29, 6.2.16, 6.3 and later are affected. Fixed in 6.12.77, 6.18.11, 6.19.1, 7.0 and their respective stable series.

Affected from

≥ 5.15.145 ≥ 6.1.29 ≥ 6.2.16 ≥ 6.3

Fixed in

✓ 6.12.77 6.12.x ✓ 6.18.11 6.18.x ✓ 6.19.1 6.19.x ✓ 7.0

References

The following references provide additional information about CVE-2026-23226 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/36ef605c0395b94b826a8c8d6f2697071173de6e
Patch
Kernel patch commit
https://git.kernel.org/stable/c/4c2ca31608521895dd742a43beca4b4d29762345
Patch
Kernel patch commit
https://git.kernel.org/stable/c/4f3a06cc57976cafa8c6f716646be6c79a99e485
Patch

4 patch commits total View all on NVD

Details

CVE ID CVE-2026-23226

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-02-18

Modified 2026-04-02

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-23226?

CVE-2026-23226 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Use After Free flaw (CWE-416) . It affects Linux kernel versions from 5.15.145 onward and has been patched in 6.12.77, 6.18.11, 6.19.1 and others. CVE-2026-23226 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-23226?

CVE-2026-23226 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-2026-23226?

Yes — CVE-2026-23226 has been patched. Fixed versions include 6.12.77, 6.18.11, 6.19.1 and others. If you are running Linux kernel 5.15.145 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-23226 actively exploited?

No — CVE-2026-23226 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. View CWE-416 on MITRE CWE →