CVE-2026-99117

{"id": "CVE-2026-99117", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2", "lessThan": "be331b23c650de9518f8266b901d8abb9b36af77", "versionType": "git"}, {"status": "affected", "version": "b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2", "lessThan": "ab836d56ff43f2e7927e88c83cd02c47a98a672e", "versionType": "git"}, {"status": "affected", "version": "b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2", "lessThan": "025c25ad73323c7dc5af4ee97fe0a2c0b3c177c8", "versionType": "git"}, {"status": "affected", "version": "b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2", "lessThan": "b0db9f4ff402becff710ab27dbd9f6fe4850b47e", "versionType": "git"}, {"status": "affected", "version": "b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2", "lessThan": "e69d4927dacd6ddaff09777a89efc0d3143d3b0d", "versionType": "git"}, {"status": "affected", "version": "b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2", "lessThan": "8243d587a081e790ad96e80d48eef44d9f7ef005", "versionType": "git"}, {"status": "affected", "version": "b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2", "lessThan": "b45e8c24608c992d1e2cea047eb5bcbfa537f86b", "versionType": "git"}, {"status": "affected", "version": "b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2", "lessThan": "5a3f7a683aee56e1f15c9d53041f3236767eaae7", "versionType": "git"}], "programFiles": ["net/bridge/br_multicast.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.10"}, {"status": "unaffected", "version": "0", "lessThan": "5.10", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.273", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.224", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.191", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.161", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.115", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.59", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.2.13", "versionType": "semver", "lessThanOrEqual": "7.2.*"}, {"status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/bridge/br_multicast.c"], "defaultStatus": "affected"}]}], "published": "2026-10-28T11:17:31.253", "references": [{"url": "https://git.kernel.org/stable/c/025c25ad73323c7dc5af4ee97fe0a2c0b3c177c8", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/5a3f7a683aee56e1f15c9d53041f3236767eaae7", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/8243d587a081e790ad96e80d48eef44d9f7ef005", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ab836d56ff43f2e7927e88c83cd02c47a98a672e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b0db9f4ff402becff710ab27dbd9f6fe4850b47e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b45e8c24608c992d1e2cea047eb5bcbfa537f86b", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/be331b23c650de9518f8266b901d8abb9b36af77", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e69d4927dacd6ddaff09777a89efc0d3143d3b0d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: mcast: don't truncate the port group walk on teardown\n\n__br_multicast_disable_port_ctx() and br_multicast_del_port() walk\nport->mglist with hlist_for_each_entry_safe(). However,\nbr_multicast_find_del_pg() can also delete other entries from the same\nlist through br_multicast_fwd_src_remove() or __fwd_del_star_excl().\n\nIf such an entry is the iterator's saved next node, hlist_del_init()\nclears its ->next and terminates the walk early. The reproducer triggers\nthis in both teardown walks, leaving port groups in the bridge mdb with\na dangling ->key.port after del_nbp() frees the port:\n\n BUG: KASAN: slab-use-after-free in __mdb_fill_info+0x1191/0x1320\n __mdb_fill_info+0x1191/0x1320\n br_mdb_dump+0x594/0xe40\n rtnl_mdb_dump+0x1cf/0x5d0\n\nUse hlist_del_init_rcu() to unlink the group while preserving ->next.\nbr_multicast_del_pg() and the teardown walks run under\nbr->multicast_lock. The GC worker must acquire the same lock before\ndetaching the group for destruction, so the node remains alive while\nthe walk uses the preserved pointer.\n\nPreserving ->next means a walk can now reach a group that an earlier\niteration already deleted as a side effect. That group is off mp->ports,\nso br_multicast_find_del_pg() would fall through its port scan and hit\nthe trailing WARN_ON(1). Skip such groups at the top of that helper: a\nport group is put on port->mglist when it is created and only unlinked\nwhen it is deleted, so hlist_unhashed() identifies exactly this case."}], "lastModified": "2026-10-31T13:17:56.280", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}