What is CVE-2026-43422?

CVE-2026-43422 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a NULL Pointer Dereference flaw (CWE-476), affecting Linux kernel versions from 6.18.17 onward and patched in 6.18.19 and 6.19.9. CVE-2026-43422 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-43422?

CVE-2026-43422 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-2026-43422?

Yes, CVE-2026-43422 has been patched. Fixed versions include 6.18.19 and 6.19.9. If you are running Linux kernel 6.18.17 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-43422 actively exploited?

CVE-2026-43422 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is NULL Pointer Dereference (CWE-476)?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/476.html

CVE-2026-43422

Medium

In the Linux kernel, the following vulnerability has been resolved: usb: legacy: ncm: Fix NPE in gncm_bind Commit 56a512a9b410 ("usb: gadget: f_ncm: align net_device lifecycle with bind/unbind") deferred the allocation of the net_device. This change leads to a NULL pointer dereference in the legacy NCM driver as it attempts to access the net_device before it's fully instantiated. Store the provided qmult, host_addr, and dev_addr into the struct ncm_opts->net_opts during gncm_bind(). These values will be properly applied to the net_device when it is allocated and configured later in the binding process by the NCM function driver.

Package Linux Kernel

Published 2026-05-08

Last modified 2026-05-22

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-476

CVE-2026-43422 is a NULL Pointer Dereference vulnerability

What is NULL Pointer Dereference?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.18.17, 6.19.7 and later are affected. Fixed in 6.18.19, 6.19.9 and their respective stable series.

Affected from

≥ 6.18.17 ≥ 6.19.7

Fixed in

✓ 6.18.19 6.18.x ✓ 6.19.9 6.19.x

References

3 total

Kernel Git
https://git.kernel.org/stable/c/b23e86a3a15803c3dcb24701285f73e65099fdf9

Patch
Kernel Git
https://git.kernel.org/stable/c/be5738d19bed244ede84da45bc45395bcb1d99e0

Patch
Kernel Git
https://git.kernel.org/stable/c/fde0634ad9856b3943a2d1a8cc8de174a63ac840

Patch

Details

CVE ID CVE-2026-43422

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-05-08

Modified 2026-05-22

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-43422?

CVE-2026-43422 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a NULL Pointer Dereference flaw (CWE-476) . It affects Linux kernel versions from 6.18.17 onward and has been patched in 6.18.19 and 6.19.9. CVE-2026-43422 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-43422?

CVE-2026-43422 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-2026-43422?

Yes. CVE-2026-43422 has been patched. Fixed versions include 6.18.19 and 6.19.9. If you are running Linux kernel 6.18.17 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-43422 actively exploited?

No. CVE-2026-43422 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.