{"cve":"CVE-2026-80733","nvd":{"published":"2026-09-03T13:06:12.050","modified":"2026-09-03T13:06:12.050","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: remove WARN_ON_ONCE() from sk_mc_loop()\n\nsk_mc_loop() can be called for sockets that are neither AF_INET\nnor AF_INET6 (e.g. AF_PACKET sockets when sending packets via raw/packet\nsocket over virtual devices such as VRF or ipvlan).\n\nIn such cases, sk_family is not AF_INET/AF_INET6 and sk_mc_loop() falls\nthrough the switch statement and triggers WARN_ON_ONCE(1).\n\nNon-INET sockets do not support IP_MULTICAST_LOOP or IPV6_MULTICAST_LOOP\noptions, so loopback should default to true without generating a warning.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f","https://git.kernel.org/stable/c/97133c4d42654578fab95abe47359ebe784dde18","https://git.kernel.org/stable/c/ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe","https://git.kernel.org/stable/c/ad7fa2f411cb30f63d6725f111be134064cdb718","https://git.kernel.org/stable/c/b8a39a09ae4eaae04309e1e38ed6a1101d967496"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:50.842544443+00:00"},"epss":{"cve":"CVE-2026-80733","score":0.00177,"percentile":0.07219,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}