CVE-2026-80733

Not scored yetLast modified Nov 6, 2026

Description

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.

Metrics

No CVSS score has been published yet.

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

VendorProductVersions
LinuxLinux>= f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90, < 97133c4d42654578fab95abe47359ebe784dde18; >= f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90, < f625c742b33dc137c209dd13d1c5f12b1c18d71c; >= f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90, < ad7fa2f411cb30f63d6725f111be134064cdb718; >= f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90, < d2adc4e80b29e58b5162ae09f0f657a215806c8c; >= f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90, < ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe; >= f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90, < c8f256dc849205ccb2bd78bd99a3497b972b44e0; >= f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90, < 0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f; >= f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90, < b8a39a09ae4eaae04309e1e38ed6a1101d967496; c91f81773cd4bbebfe744e9ab30a7ce093f9b930; c8c30b2b17f2133e953850c547e3902c3a3d80e2; 3fe207e4637a2e792c46a08666aa722f77d7f8f7; >= 3.14.40, < 3.15; >= 3.18.13, < 3.19; >= 3.19.6, < 3.20
LinuxLinux4.0

References

Timeline

Published
Sep 3, 2026
Last modified
Nov 6, 2026
NVD status
Received

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CVE-2026-80733: Unscored | Vulnix