What is CVE-2026-23040?

CVE-2026-23040 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 6.18 onward and patched in 6.18.6 and 6.19. CVE-2026-23040 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-23040?

CVE-2026-23040 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2026-23040?

Yes, CVE-2026-23040 has been patched. Fixed versions include 6.18.6 and 6.19. If you are running Linux kernel 6.18 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-23040 actively exploited?

CVE-2026-23040 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-23040

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211_hwsim: fix typo in frequency notification The NAN notification is for 5745 MHz which corresponds to channel 149 and not 5475 which is not actually a valid channel. This could result in a NULL pointer dereference in cfg80211_next_nan_dw_notif.

Package Linux Kernel

Published 2026-02-04

Last modified 2026-04-15

Patch available

Yes

Affected versions

Linux kernel versions 6.18 and later are affected. Fixed in 6.18.6, 6.19 and their respective stable series.

Affected from

≥ 6.18

Fixed in

✓ 6.18.6 6.18.x ✓ 6.19

References

The following references provide additional information about CVE-2026-23040 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/1251bbdb8f5b2ea86ca9b4268a2e6aa34372ab33
Patch
Kernel patch commit
https://git.kernel.org/stable/c/333418872bfecf4843f1ded7a4151685dfcf07d5
Patch

Frequently asked questions

What is CVE-2026-23040?

CVE-2026-23040 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.18 onward and has been patched in 6.18.6 and 6.19. CVE-2026-23040 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2026-23040?

Yes — CVE-2026-23040 has been patched. Fixed versions include 6.18.6 and 6.19. If you are running Linux kernel 6.18 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-23040 actively exploited?

No — CVE-2026-23040 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.