CVE-2026-99117 (GCVE-0-2026-99117)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:34 – Updated: 2026-10-31 12:43
VLAI
Title
net: bridge: mcast: don't truncate the port group walk on teardown
Summary
In the Linux kernel, the following vulnerability has been resolved: net: bridge: mcast: don't truncate the port group walk on teardown __br_multicast_disable_port_ctx() and br_multicast_del_port() walk port->mglist with hlist_for_each_entry_safe(). However, br_multicast_find_del_pg() can also delete other entries from the same list through br_multicast_fwd_src_remove() or __fwd_del_star_excl(). If such an entry is the iterator's saved next node, hlist_del_init() clears its ->next and terminates the walk early. The reproducer triggers this in both teardown walks, leaving port groups in the bridge mdb with a dangling ->key.port after del_nbp() frees the port: BUG: KASAN: slab-use-after-free in __mdb_fill_info+0x1191/0x1320 __mdb_fill_info+0x1191/0x1320 br_mdb_dump+0x594/0xe40 rtnl_mdb_dump+0x1cf/0x5d0 Use hlist_del_init_rcu() to unlink the group while preserving ->next. br_multicast_del_pg() and the teardown walks run under br->multicast_lock. The GC worker must acquire the same lock before detaching the group for destruction, so the node remains alive while the walk uses the preserved pointer. Preserving ->next means a walk can now reach a group that an earlier iteration already deleted as a side effect. That group is off mp->ports, so br_multicast_find_del_pg() would fall through its port scan and hit the trailing WARN_ON(1). Skip such groups at the top of that helper: a port group is put on port->mglist when it is created and only unlinked when it is deleted, so hlist_unhashed() identifies exactly this case.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2 , < be331b23c650de9518f8266b901d8abb9b36af77 (git)
Affected: b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2 , < ab836d56ff43f2e7927e88c83cd02c47a98a672e (git)
Affected: b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2 , < 025c25ad73323c7dc5af4ee97fe0a2c0b3c177c8 (git)
Affected: b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2 , < b0db9f4ff402becff710ab27dbd9f6fe4850b47e (git)
Affected: b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2 , < e69d4927dacd6ddaff09777a89efc0d3143d3b0d (git)
Affected: b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2 , < 8243d587a081e790ad96e80d48eef44d9f7ef005 (git)
Affected: b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2 , < b45e8c24608c992d1e2cea047eb5bcbfa537f86b (git)
Affected: b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2 , < 5a3f7a683aee56e1f15c9d53041f3236767eaae7 (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.161 , ≤ 6.6.* (semver)
Unaffected: 6.12.115 , ≤ 6.12.* (semver)
Unaffected: 6.18.59 , ≤ 6.18.* (semver)
Unaffected: 7.2.13 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: mcast: don\u0027t truncate the port group walk on teardown\n\n__br_multicast_disable_port_ctx() and br_multicast_del_port() walk\nport-\u003emglist 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\u0027s saved next node, hlist_del_init()\nclears its -\u003enext and terminates the walk early. The reproducer triggers\nthis in both teardown walks, leaving port groups in the bridge mdb with\na dangling -\u003ekey.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 -\u003enext.\nbr_multicast_del_pg() and the teardown walks run under\nbr-\u003emulticast_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 -\u003enext means a walk can now reach a group that an earlier\niteration already deleted as a side effect. That group is off mp-\u003eports,\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-\u003emglist when it is created and only unlinked\nwhen it is deleted, so hlist_unhashed() identifies exactly this case."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "lang": "en",
              "value": "AV:L - A local RTM_SETLINK with IFLA_MASTER=0 reaches rtnl_setlink()\u2192do_set_master()\u2192br_del_if()\u2192del_nbp()\u2192br_multicast_del_port()\u2192br_multicast_find_del_pg()\u2192patched 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-\u003emglist 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\u0027s 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\u0027s 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-\u003ekey.port after release_nbp() frees the net_bridge_port; RTM_GETMDB reaches __mdb_fill_info(), which follows reclaimed port-\u003edev 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\u0027s namespace."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/ab836d56ff43f2e7927e88c83cd02c47a98a672e"
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          "url": "https://git.kernel.org/stable/c/b0db9f4ff402becff710ab27dbd9f6fe4850b47e"
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      "title": "net: bridge: mcast: don\u0027t truncate the port group walk on teardown",
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    "cveId": "CVE-2026-99117",
    "datePublished": "2026-10-28T10:34:33.874Z",
    "dateReserved": "2026-09-25T10:25:14.392Z",
    "dateUpdated": "2026-10-31T12:43:18.238Z",
    "state": "PUBLISHED"
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      "date": "2026-11-10",
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      "percentile": "0.02315"
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    "microsoft_vex": {
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      "cve": "CVE-2026-99117",
      "id": "msrc_CVE-2026-99117",
      "initial_release_date": "2026-10-29T01:04:04.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net: bridge: mcast: don\u0027t truncate the port group walk on teardown",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-99117.json",
      "version": "4"
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          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: mcast: don\u0027t truncate the port group walk on teardown\n\n__br_multicast_disable_port_ctx() and br_multicast_del_port() walk\nport-\u003emglist 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\u0027s saved next node, hlist_del_init()\nclears its -\u003enext and terminates the walk early. The reproducer triggers\nthis in both teardown walks, leaving port groups in the bridge mdb with\na dangling -\u003ekey.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 -\u003enext.\nbr_multicast_del_pg() and the teardown walks run under\nbr-\u003emulticast_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 -\u003enext means a walk can now reach a group that an earlier\niteration already deleted as a side effect. That group is off mp-\u003eports,\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-\u003emglist when it is created and only unlinked\nwhen it is deleted, so hlist_unhashed() identifies exactly this case."
          }
        ],
        "id": "CVE-2026-99117",
        "lastModified": "2026-10-31T13:17:56.280",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-28T11:17:31.253",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "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"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-10T17:48:08+00:00",
      "cve": "CVE-2026-99117",
      "id": "CVE-2026-99117",
      "initial_release_date": "2026-10-28T00:00:00+00:00",
      "product_status:known_affected": "175",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: bridge: mcast: don\u0027t truncate the port group walk on teardown",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99117.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-10T18:08:47Z",
      "cve": "CVE-2026-99117",
      "id": "CVE-2026-99117",
      "initial_release_date": "2026-10-28T17:34:38Z",
      "product_status:known_affected": "208",
      "product_status:known_not_affected": "143",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-99117",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-99117.json",
      "version": "5"
    }
  }
}



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