CVE-2026-80733

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxf60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 < 97133c4d42654578fab95abe47359ebe784dde18affected
LinuxLinuxf60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 < f625c742b33dc137c209dd13d1c5f12b1c18d71caffected
LinuxLinuxf60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 < ad7fa2f411cb30f63d6725f111be134064cdb718affected
LinuxLinuxf60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 < d2adc4e80b29e58b5162ae09f0f657a215806c8caffected
LinuxLinuxf60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 < ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfeaffected
LinuxLinuxf60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 < c8f256dc849205ccb2bd78bd99a3497b972b44e0affected
LinuxLinuxf60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 < 0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1faffected
LinuxLinuxf60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 < b8a39a09ae4eaae04309e1e38ed6a1101d967496affected
LinuxLinuxc91f81773cd4bbebfe744e9ab30a7ce093f9b930affected
LinuxLinuxc8c30b2b17f2133e953850c547e3902c3a3d80e2affected
LinuxLinux3fe207e4637a2e792c46a08666aa722f77d7f8f7affected
LinuxLinux3.14.40 < 3.15affected
LinuxLinux3.18.13 < 3.19affected
LinuxLinux3.19.6 < 3.20affected
LinuxLinux4.0affected
LinuxLinux0 < 4.0unaffected
LinuxLinux5.10.265 <= 5.10.*unaffected
LinuxLinux5.15.216 <= 5.15.*unaffected
LinuxLinux6.1.183 <= 6.1.*unaffected
LinuxLinux6.6.152 <= 6.6.*unaffected
LinuxLinux6.12.104 <= 6.12.*unaffected
LinuxLinux6.18.45 <= 6.18.*unaffected
LinuxLinux7.1.9 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References