What is CVE-2026-80640?

CVE-2026-80640 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 6.15 onward and patched in 6.18.40, 7.1.5 and 7.2. CVE-2026-80640 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-80640?

CVE-2026-80640 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2026-80640?

Yes, CVE-2026-80640 has been patched. Fixed versions include 6.18.40, 7.1.5 and 7.2. 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-2026-80640 actively exploited?

CVE-2026-80640 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-80640

In the Linux kernel, the following vulnerability has been resolved: cxl/fwctl: Fix __fortify_panic Fix a runtime assertion in cxlctl_get_supported_features(). Fortify complains that it is potentially overflowing the entries array per __counted_by_le(num_entries). Quiet the false positive by initializing @num_entries earlier. memcpy: detected buffer overflow: 48 byte write of buffer size 0 WARNING: lib/string_helpers.c:1036 at __fortify_report+0x4d/0xa0, CPU#7: fwctl/1398 RIP: 0010:__fortify_report+0x50/0xa0 Call Trace: __fortify_panic+0xd/0xf cxlctl_get_supported_features.cold+0x23/0x35 [cxl_core]

Package Linux Kernel

Published 2026-08-28

Last modified 2026-08-28

Patch available

Yes

Affected versions

Linux kernel versions 6.15 and later are affected. Fixed in 6.18.40, 7.1.5, 7.2 and their respective stable series.

Affected from

≥ 6.15

Fixed in

✓ 6.18.40 6.18.x ✓ 7.1.5 7.1.x ✓ 7.2

References

3 total

Frequently asked questions

What is CVE-2026-80640?

CVE-2026-80640 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.15 onward and has been patched in 6.18.40, 7.1.5 and 7.2. CVE-2026-80640 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2026-80640?

Yes. CVE-2026-80640 has been patched. Fixed versions include 6.18.40, 7.1.5 and 7.2. 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-2026-80640 actively exploited?

No. CVE-2026-80640 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.