What is CVE-2026-53042?

CVE-2026-53042 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Access of Uninitialized Pointer flaw (CWE-824), affecting Linux kernel versions from 6.15 onward and patched in 6.18.33, 7.0.10 and 7.1. CVE-2026-53042 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-53042?

CVE-2026-53042 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-2026-53042?

Yes, CVE-2026-53042 has been patched. Fixed versions include 6.18.33, 7.0.10 and 7.1. If you are running Linux kernel 6.15 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-53042 actively exploited?

CVE-2026-53042 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Access of Uninitialized Pointer (CWE-824)?

The product accesses or uses a pointer that has not been initialised, leading to undefined behaviour. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/824.html

CVE-2026-53042

Medium

In the Linux kernel, the following vulnerability has been resolved: fwctl: Fix class init ordering to avoid NULL pointer dereference on device removal CXL is linked before fwctl in drivers/Makefile. Both use `module_init, so `cxl_pci_driver_init()` runs first. When `cxl_pci_probe()` calls `fwctl_register()` and then `device_add()`, fwctl_class is not yet registered because fwctl_init() hasn't run, causing `class_to_subsys()` to return NULL and skip knode_class initialization. On device removal, `class_to_subsys()` returns non-NULL, and `device_del()` calls `klist_del()` on the uninitialized knode, triggering a NULL pointer dereference.

Package Linux Kernel

Published 2026-06-24

Last modified 2026-07-14

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-824

CVE-2026-53042 is a Access of Uninitialized Pointer vulnerability

What is Access of Uninitialized Pointer?

The product accesses or uses a pointer that has not been initialised, leading to undefined behaviour. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.15 and later are affected. Fixed in 6.18.33, 7.0.10, 7.1 and their respective stable series.

Affected from

≥ 6.15

Fixed in

✓ 6.18.33 6.18.x ✓ 7.0.10 7.0.x ✓ 7.1

References

3 total

Kernel Git
https://git.kernel.org/stable/c/1075f2f590fdac147f8b8010c35b606564b5c7d7

Patch
Kernel Git
https://git.kernel.org/stable/c/a28f56988c8e5bb9375806a5cfb0bf54d662ae3f

Patch
Kernel Git
https://git.kernel.org/stable/c/a55f80233f384dc89ef3425b2e1dd0e6d44bcf29

Patch

Details

CVE ID CVE-2026-53042

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-06-24

Modified 2026-07-14

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-53042?

CVE-2026-53042 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as an Access of Uninitialized Pointer flaw (CWE-824) . It affects Linux kernel versions from 6.15 onward and has been patched in 6.18.33, 7.0.10 and 7.1. CVE-2026-53042 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-53042?

CVE-2026-53042 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-2026-53042?

Yes. CVE-2026-53042 has been patched. Fixed versions include 6.18.33, 7.0.10 and 7.1. If you are running Linux kernel 6.15 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-53042 actively exploited?

No. CVE-2026-53042 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.