{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99031","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-25T10:25:14.387Z","datePublished":"2026-10-23T12:21:31.535Z","dateUpdated":"2026-10-30T12:41:04.054Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-10-30T12:41:04.054Z"},"descriptions":[{"lang":"en","value":"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bridge/br_multicast.c"],"versions":[{"version":"8266a0491e92d39dc9af739e8380a0daa9b8836b","lessThan":"0ed8edcbcf2290dba13c1beeba27fc19ad38515b","status":"affected","versionType":"git"},{"version":"8266a0491e92d39dc9af739e8380a0daa9b8836b","lessThan":"6a7385f6605958aa69eeb185c91f45d77640d1e2","status":"affected","versionType":"git"},{"version":"8266a0491e92d39dc9af739e8380a0daa9b8836b","lessThan":"26142868b0767e95e28b7a1237f58b292b54d1d9","status":"affected","versionType":"git"},{"version":"8266a0491e92d39dc9af739e8380a0daa9b8836b","lessThan":"695a5a4c69c922d9296b2d7ad5f1ce8c6858fc64","status":"affected","versionType":"git"},{"version":"8266a0491e92d39dc9af739e8380a0daa9b8836b","lessThan":"2fb87c6025f90191516bee3ce14b42eb3e1cfed7","status":"affected","versionType":"git"},{"version":"8266a0491e92d39dc9af739e8380a0daa9b8836b","lessThan":"d109141ba14652146089ef78b32d5e4d5285ebad","status":"affected","versionType":"git"},{"version":"8266a0491e92d39dc9af739e8380a0daa9b8836b","lessThan":"7931fb9181421953f3133b408b0f2e2b8dd68b61","status":"affected","versionType":"git"},{"version":"8266a0491e92d39dc9af739e8380a0daa9b8836b","lessThan":"5158353121bae4f552cb677ce8c5c3ef52f93a0d","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bridge/br_multicast.c"],"versions":[{"version":"5.10","status":"affected"},{"version":"0","lessThan":"5.10","status":"unaffected","versionType":"semver"},{"version":"5.10.273","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.224","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.191","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.113","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.57","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.11","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"7.2.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"7.3"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/0ed8edcbcf2290dba13c1beeba27fc19ad38515b"},{"url":"https://git.kernel.org/stable/c/6a7385f6605958aa69eeb185c91f45d77640d1e2"},{"url":"https://git.kernel.org/stable/c/26142868b0767e95e28b7a1237f58b292b54d1d9"},{"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"}],"title":"net: bridge: avoid recursive multicast port cleanup","x_generator":{"engine":"bippy-1.2.0"}}}}