264 lines
15 KiB
JSON
264 lines
15 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2026-99117",
|
|
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "Linux",
|
|
"dateReserved": "2026-09-25T10:25:14.392Z",
|
|
"datePublished": "2026-10-28T10:34:33.874Z",
|
|
"dateUpdated": "2026-10-31T12:43:18.238Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"shortName": "Linux",
|
|
"dateUpdated": "2026-10-31T12:43:18.238Z"
|
|
},
|
|
"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."
|
|
}
|
|
],
|
|
"metrics": [
|
|
{
|
|
"cvssV3_1": {
|
|
"version": "3.1",
|
|
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
|
|
"baseScore": 7.8,
|
|
"baseSeverity": "HIGH"
|
|
},
|
|
"scenarios": [
|
|
{
|
|
"lang": "en",
|
|
"value": "AV:L - A local RTM_SETLINK with IFLA_MASTER=0 reaches rtnl_setlink()→do_set_master()→br_del_if()→del_nbp()→br_multicast_del_port()→br_multicast_find_del_pg()→patched br_multicast_del_pg(); IGMPv3 reports can prepare membership state but cannot perform the required port teardown.\nAC:L - By adding several temporary (S,G) entries before corresponding IGMPv3 MODE_IS_INCLUDE reports, the attacker deterministically orders port->mglist so cascading deletion removes each saved next node; detaching the port then triggers both truncated walks without a race or external timing.\nPR:L - rtnetlink_rcv_msg() requires CAP_NET_ADMIN in the socket's network namespace for RTM_NEWMDB and RTM_SETLINK. set_cred_user_ns() grants that capability to an unprivileged caller in a new user and network namespace, so ordinary local access suffices.\nUI:N - The attacker creates the bridge and memberships, injects the IGMPv3 reports, detaches the port, and requests RTM_GETMDB without requiring another user to act.\nS:U - The dangling net_bridge_port pointer and surviving bridge MDB groups remain within the host kernel's security authority; exploitation from a user-created network namespace is ordinary kernel privilege escalation, not a VM, IOMMU, or hypervisor boundary crossing.\nC:H - The surviving port group retains pg->key.port after release_nbp() frees the net_bridge_port; RTM_GETMDB reaches __mdb_fill_info(), which follows reclaimed port->dev and returns derived data, allowing heap reclamation to steer kernel reads through the dangling pointer.\nI:H - When a surviving source expires, br_multicast_group_src_expired() reaches br_multicast_del_pg() through the dangling key.port; br_multicast_port_ngroups_dec() then writes mdb_n_entries through freed or reclaimed port memory, supporting memory corruption and control-flow exploitation.\nA:H - The demonstrated RTM_GETMDB path produces a KASAN slab-use-after-free in __mdb_fill_info(), while surviving source or port-group timers also dereference the freed port; these paths can oops or panic the kernel and are repeatable from the attacker's namespace."
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"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": "b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2",
|
|
"lessThan": "be331b23c650de9518f8266b901d8abb9b36af77",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2",
|
|
"lessThan": "ab836d56ff43f2e7927e88c83cd02c47a98a672e",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2",
|
|
"lessThan": "025c25ad73323c7dc5af4ee97fe0a2c0b3c177c8",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2",
|
|
"lessThan": "b0db9f4ff402becff710ab27dbd9f6fe4850b47e",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2",
|
|
"lessThan": "e69d4927dacd6ddaff09777a89efc0d3143d3b0d",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2",
|
|
"lessThan": "8243d587a081e790ad96e80d48eef44d9f7ef005",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2",
|
|
"lessThan": "b45e8c24608c992d1e2cea047eb5bcbfa537f86b",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2",
|
|
"lessThan": "5a3f7a683aee56e1f15c9d53041f3236767eaae7",
|
|
"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": "6.6.161",
|
|
"lessThanOrEqual": "6.6.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.12.115",
|
|
"lessThanOrEqual": "6.12.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.18.59",
|
|
"lessThanOrEqual": "6.18.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "7.2.13",
|
|
"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": "6.6.161"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "5.10",
|
|
"versionEndExcluding": "6.12.115"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "5.10",
|
|
"versionEndExcluding": "6.18.59"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "5.10",
|
|
"versionEndExcluding": "7.2.13"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "5.10",
|
|
"versionEndExcluding": "7.3"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/be331b23c650de9518f8266b901d8abb9b36af77"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/ab836d56ff43f2e7927e88c83cd02c47a98a672e"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/025c25ad73323c7dc5af4ee97fe0a2c0b3c177c8"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/b0db9f4ff402becff710ab27dbd9f6fe4850b47e"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/e69d4927dacd6ddaff09777a89efc0d3143d3b0d"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/8243d587a081e790ad96e80d48eef44d9f7ef005"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/b45e8c24608c992d1e2cea047eb5bcbfa537f86b"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/5a3f7a683aee56e1f15c9d53041f3236767eaae7"
|
|
}
|
|
],
|
|
"title": "net: bridge: mcast: don't truncate the port group walk on teardown",
|
|
"x_generator": {
|
|
"engine": "bippy-1.2.0"
|
|
}
|
|
}
|
|
}
|
|
} |