CVE-2026-80733
net: remove WARN_ON_ONCE() from sk_mc_loop()
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Sep 3, 2026 |
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Affected Versions
Linux / Linux
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
Linux / Linux
4.0
References
git.kernel.org: https://git.kernel.org/stable/c/97133c4d42654578fab95abe47359ebe784dde18 git.kernel.org: https://git.kernel.org/stable/c/f625c742b33dc137c209dd13d1c5f12b1c18d71c git.kernel.org: https://git.kernel.org/stable/c/ad7fa2f411cb30f63d6725f111be134064cdb718 git.kernel.org: https://git.kernel.org/stable/c/d2adc4e80b29e58b5162ae09f0f657a215806c8c git.kernel.org: https://git.kernel.org/stable/c/ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe git.kernel.org: https://git.kernel.org/stable/c/c8f256dc849205ccb2bd78bd99a3497b972b44e0 git.kernel.org: https://git.kernel.org/stable/c/0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f git.kernel.org: https://git.kernel.org/stable/c/b8a39a09ae4eaae04309e1e38ed6a1101d967496