net: remove WARN_ON_ONCE() from sk_mc_loop()

Summary

CVECVE-2026-80733
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-03 13:06:12 UTC
Updated2026-09-03 13:06:12 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.002100000 probability, percentile 0.111730000 (date 2026-09-03)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 97133c4d42654578fab95abe47359ebe784dde18 git Not specified
CNA Linux Linux affected f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 f625c742b33dc137c209dd13d1c5f12b1c18d71c git Not specified
CNA Linux Linux affected f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 ad7fa2f411cb30f63d6725f111be134064cdb718 git Not specified
CNA Linux Linux affected f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 d2adc4e80b29e58b5162ae09f0f657a215806c8c git Not specified
CNA Linux Linux affected f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe git Not specified
CNA Linux Linux affected f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 c8f256dc849205ccb2bd78bd99a3497b972b44e0 git Not specified
CNA Linux Linux affected f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f git Not specified
CNA Linux Linux affected f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 b8a39a09ae4eaae04309e1e38ed6a1101d967496 git Not specified
CNA Linux Linux affected c91f81773cd4bbebfe744e9ab30a7ce093f9b930 git Not specified
CNA Linux Linux affected c8c30b2b17f2133e953850c547e3902c3a3d80e2 git Not specified
CNA Linux Linux affected 3fe207e4637a2e792c46a08666aa722f77d7f8f7 git Not specified
CNA Linux Linux affected 3.14.40 3.15 semver Not specified
CNA Linux Linux affected 3.18.13 3.19 semver Not specified
CNA Linux Linux affected 3.19.6 3.20 semver Not specified
CNA Linux Linux affected 4.0 Not specified
CNA Linux Linux unaffected 4.0 semver Not specified
CNA Linux Linux unaffected 5.10.265 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.152 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.104 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.45 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ad7fa2f411cb30f63d6725f111be134064cdb718 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/97133c4d42654578fab95abe47359ebe784dde18 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b8a39a09ae4eaae04309e1e38ed6a1101d967496 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c8f256dc849205ccb2bd78bd99a3497b972b44e0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f625c742b33dc137c209dd13d1c5f12b1c18d71c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d2adc4e80b29e58b5162ae09f0f657a215806c8c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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