{"id":"CVE-2026-99031","summary":"net: bridge: avoid recursive multicast port cleanup","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: avoid recursive multicast port cleanup\n\nbr_multicast_sg_del_exclude_ports() removes automatically added STAR_EXCL\nport groups by calling br_multicast_del_pg(). For S,G entries, that\ndeletion calls back into br_multicast_sg_del_exclude_ports(), so a large\nnumber of STAR_EXCL ports consumes one kernel stack frame per port and can\nhit the stack guard page.\n\nKeep the complete port-group deletion path for cleanup, but suppress the\nS,G exclude-port cleanup while that helper is already walking the same\nentry. Normal deletion callers retain the existing behavior.","modified":"2026-11-01T02:30:32.298366085Z","published":"2026-10-23T12:21:31.535Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99031.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0ed8edcbcf2290dba13c1beeba27fc19ad38515b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/26142868b0767e95e28b7a1237f58b292b54d1d9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2fb87c6025f90191516bee3ce14b42eb3e1cfed7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5158353121bae4f552cb677ce8c5c3ef52f93a0d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/695a5a4c69c922d9296b2d7ad5f1ce8c6858fc64"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6a7385f6605958aa69eeb185c91f45d77640d1e2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7931fb9181421953f3133b408b0f2e2b8dd68b61"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d109141ba14652146089ef78b32d5e4d5285ebad"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99031.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99031"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8266a0491e92d39dc9af739e8380a0daa9b8836b"},{"fixed":"0ed8edcbcf2290dba13c1beeba27fc19ad38515b"},{"fixed":"6a7385f6605958aa69eeb185c91f45d77640d1e2"},{"fixed":"26142868b0767e95e28b7a1237f58b292b54d1d9"},{"fixed":"695a5a4c69c922d9296b2d7ad5f1ce8c6858fc64"},{"fixed":"2fb87c6025f90191516bee3ce14b42eb3e1cfed7"},{"fixed":"d109141ba14652146089ef78b32d5e4d5285ebad"},{"fixed":"7931fb9181421953f3133b408b0f2e2b8dd68b61"},{"fixed":"5158353121bae4f552cb677ce8c5c3ef52f93a0d"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-99031.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.10.0"},{"fixed":"5.10.273"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.224"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.191"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.160"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.113"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.57"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-99031.json"}}],"schema_version":"1.9.2"}