What is CVE-2026-80733?

CVE-2026-80733 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 3.14.40 onward and patched in 5.10.265, 5.15.216, 6.1.183 and others. CVE-2026-80733 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-80733?

CVE-2026-80733 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2026-80733?

Yes, CVE-2026-80733 has been patched. Fixed versions include 5.10.265, 5.15.216, 6.1.183 and others. If you are running Linux kernel 3.14.40 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-80733 actively exploited?

CVE-2026-80733 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-80733

In the Linux kernel, the following vulnerability has been resolved: net: remove WARN_ON_ONCE() from sk_mc_loop() sk_mc_loop() can be called for sockets that are neither AF_INET nor AF_INET6 (e.g. AF_PACKET sockets when sending packets via raw/packet socket over virtual devices such as VRF or ipvlan). In such cases, sk_family is not AF_INET/AF_INET6 and sk_mc_loop() falls through the switch statement and triggers WARN_ON_ONCE(1). Non-INET sockets do not support IP_MULTICAST_LOOP or IPV6_MULTICAST_LOOP options, so loopback should default to true without generating a warning.

Package Linux Kernel

Published 2026-09-03

Last modified 2026-09-03

Patch available

Yes

Affected versions

Linux kernel versions 3.14.40, 3.18.13, 3.19.6, 4.0 and later are affected. Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.152, 6.12.104, 6.18.45, 7.1.9, 7.2 and their respective stable series.

Affected from

≥ 3.14.40 ≥ 3.18.13 ≥ 3.19.6 ≥ 4.0

Fixed in

✓ 5.10.265 5.10.x ✓ 5.15.216 5.15.x ✓ 6.1.183 6.1.x ✓ 6.6.152 6.6.x ✓ 6.12.104 6.12.x ✓ 6.18.45 6.18.x ✓ 7.1.9 7.1.x ✓ 7.2

References

8 total

Showing 5 of 8 references View all on NVD

Frequently asked questions

What is CVE-2026-80733?

CVE-2026-80733 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 3.14.40 onward and has been patched in 5.10.265, 5.15.216, 6.1.183 and others. CVE-2026-80733 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2026-80733?

Yes. CVE-2026-80733 has been patched. Fixed versions include 5.10.265, 5.15.216, 6.1.183 and others. If you are running Linux kernel 3.14.40 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-80733 actively exploited?

No. CVE-2026-80733 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.