{"id":"CVE-2026-99031","title":"net: bridge: avoid recursive multicast port cleanup","summary":"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_p…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 8266a0491e92d39dc9af739e8380a0daa9b8836b < 695a5a4c69c922d9296b2d7ad5f1ce8c6858fc64","Linux >= 8266a0491e92d39dc9af739e8380a0daa9b8836b < 2fb87c6025f90191516bee3ce14b42eb3e1cfed7","Linux >= 8266a0491e92d39dc9af739e8380a0daa9b8836b < d109141ba14652146089ef78b32d5e4d5285ebad","Linux >= 8266a0491e92d39dc9af739e8380a0daa9b8836b < 7931fb9181421953f3133b408b0f2e2b8dd68b61","Linux >= 8266a0491e92d39dc9af739e8380a0daa9b8836b < 5158353121bae4f552cb677ce8c5c3ef52f93a0d","Linux 5.10"],"published":"2026-10-23","updated":"2026-10-23","sourceUpdated":"2026-10-23T12:21:31.535Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99031","references":[{"url":"https://git.kernel.org/stable/c/695a5a4c69c922d9296b2d7ad5f1ce8c6858fc64"},{"url":"https://git.kernel.org/stable/c/2fb87c6025f90191516bee3ce14b42eb3e1cfed7"},{"url":"https://git.kernel.org/stable/c/d109141ba14652146089ef78b32d5e4d5285ebad"},{"url":"https://git.kernel.org/stable/c/7931fb9181421953f3133b408b0f2e2b8dd68b61"},{"url":"https://git.kernel.org/stable/c/5158353121bae4f552cb677ce8c5c3ef52f93a0d"}],"tags":["cve.org"],"ingestedAt":"2026-10-23T13:24:55.533Z","slug":"CVE-2026-99031","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 8266a0491e92d39dc9af739e8380a0daa9b8836b < 695a5a4c69c922d9296b2d7ad5f1ce8c6858fc64`\n- `Linux >= 8266a0491e92d39dc9af739e8380a0daa9b8836b < 2fb87c6025f90191516bee3ce14b42eb3e1cfed7`\n- `Linux >= 8266a0491e92d39dc9af739e8380a0daa9b8836b < d109141ba14652146089ef78b32d5e4d5285ebad`\n- `Linux >= 8266a0491e92d39dc9af739e8380a0daa9b8836b < 7931fb9181421953f3133b408b0f2e2b8dd68b61`\n- `Linux >= 8266a0491e92d39dc9af739e8380a0daa9b8836b < 5158353121bae4f552cb677ce8c5c3ef52f93a0d`\n- `Linux 5.10`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}