What is CVE-2026-43463?

CVE-2026-43463 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 6.7.3 onward and patched in 6.18.19, 6.19.9 and 7.0. CVE-2026-43463 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-43463?

CVE-2026-43463 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-2026-43463?

Yes, CVE-2026-43463 has been patched. Fixed versions include 6.18.19, 6.19.9 and 7.0. If you are running Linux kernel 6.7.3 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-43463 actively exploited?

CVE-2026-43463 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-2026-43463

Medium

In the Linux kernel, the following vulnerability has been resolved: rxrpc, afs: Fix missing error pointer check after rxrpc_kernel_lookup_peer() rxrpc_kernel_lookup_peer() can also return error pointers in addition to NULL, so just checking for NULL is not sufficient. Fix this by: (1) Changing rxrpc_kernel_lookup_peer() to return -ENOMEM rather than NULL on allocation failure. (2) Making the callers in afs use IS_ERR() and PTR_ERR() to pass on the error code returned.

Package Linux Kernel

Published 2026-05-08

Last modified 2026-05-20

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-2026-43463 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 6.7.3, 6.8 and later are affected. Fixed in 6.18.19, 6.19.9, 7.0 and their respective stable series.

Affected from

≥ 6.7.3 ≥ 6.8

Fixed in

✓ 6.18.19 6.18.x ✓ 6.19.9 6.19.x ✓ 7.0

References

The following references provide additional information about CVE-2026-43463 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/4245a79003adf30e67f8e9060915bd05cb31d142
Patch
Kernel patch commit
https://git.kernel.org/stable/c/54331c5dcc6d97683d7ca2788e7ef9c9505e1477
Patch
Kernel patch commit
https://git.kernel.org/stable/c/d55fa7cd4b19ba91b34b307d769c149e56ad0a75
Patch

Details

CVE ID CVE-2026-43463

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-05-08

Modified 2026-05-20

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-43463?

CVE-2026-43463 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 6.7.3 onward and has been patched in 6.18.19, 6.19.9 and 7.0. CVE-2026-43463 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-43463?

CVE-2026-43463 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-2026-43463?

Yes — CVE-2026-43463 has been patched. Fixed versions include 6.18.19, 6.19.9 and 7.0. If you are running Linux kernel 6.7.3 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-43463 actively exploited?

No — CVE-2026-43463 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (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. View CWE-476 on MITRE CWE →