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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: mgmt: fix UAF in pair command cancellation\n\nThe pairing completion and authentication failure callbacks look up the\npending MGMT_OP_PAIR_DEVICE command by walking hdev-\u003emgmt_pending. The\nlookup returned a command that was still linked on the shared pending list,\nwithout keeping mgmt_pending_lock held for the later dereference and\nremoval.\n\nA concurrent MGMT_OP_CANCEL_PAIR_DEVICE request can remove and free the\nsame pending command before the callback uses it. The reverse race is also\npossible when cancel_pair_device() gets a command from pending_find() and a\ncallback removes it before the cancel path dereferences it. This can lead\nto a use-after-free and a second list_del().\n\nMake the pairing lookup helpers transfer ownership of the pending command\nby removing it from hdev-\u003emgmt_pending while holding mgmt_pending_lock.\nThe callbacks and cancel path then complete the command and free it\ndirectly, so racing paths cannot find or free the same command again. Take\na temporary hci_conn reference in cancel_pair_device() because the command\ncompletion drops the reference stored in the pending command."
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              "value": "AV:L - The UAF is triggered through local AF_BLUETOOTH HCI_CHANNEL_CONTROL management commands (hci_sock_bind/sendmsg -\u003e hci_mgmt_cmd -\u003e pair_device/cancel_pair_device); remote Bluetooth peers cannot issue MGMT_OP_PAIR_DEVICE or MGMT_OP_CANCEL_PAIR_DEVICE over the air.\nAC:L - An attacker controls the race by concurrently issuing MGMT_OP_PAIR_DEVICE and MGMT_OP_CANCEL_PAIR_DEVICE from threads or sockets they own while pairing HCI callbacks fire, and can retry until cancel and completion/auth/SMP paths interleave on the same pending command.\nPR:L - pair_device and cancel_pair_device lack HCI_MGMT_UNTRUSTED and require HCI_SOCK_TRUSTED (CAP_NET_ADMIN at bind); per kernel CNA guidance CAP_NET_ADMIN reachable via unprivileged user namespaces (unshare -Urn) maps to PR:L, consistent with similar Bluetooth mgmt UAF scores.\nUI:N - No victim interaction is required beyond a powered Bluetooth controller; the attacker directly sends the conflicting PAIR_DEVICE and CANCEL_PAIR_DEVICE management commands that create the pending entry and race the unlocked find_pairing/pending_find paths against completion callbacks.\nS:U - Exploitation corrupts kernel Bluetooth MGMT heap objects (mgmt_pending_cmd) within the same host kernel security authority; this is standard local kernel memory corruption, not a VM, IOMMU, or cross-authority boundary escape.\nC:H - Use-after-free of mgmt_pending_cmd when find_pairing or pending_find returns a still-linked command without holding mgmt_pending_lock through later dereference and mgmt_pending_remove, enabling arbitrary kernel memory disclosure via slab reuse of the freed object.\nI:H - Slab UAF and double list_del on mgmt_pending_cmd during concurrent cancel_pair_device and pairing/auth/SMP completion callbacks provide attacker-influenced heap corruption primitives exploitable for arbitrary kernel writes and control-flow hijacking per kernel UAF guidance.\nA:H - Dereferencing or list_del on a freed mgmt_pending_cmd during the cancel versus callback race causes kernel oops or panic; repeated concurrent PAIR_DEVICE and CANCEL_PAIR_DEVICE commands during active pairing can reliably crash or hang the system."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        },
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        },
        {
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      ],
      "title": "Bluetooth: mgmt: fix UAF in pair command cancellation",
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    "dateReserved": "2026-08-15T05:44:03.909Z",
    "dateUpdated": "2026-10-16T19:05:51.530Z",
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      "title": "packet: use consistent hard_header_len in non-ring send paths",
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              "lessThanOrEqual": "5.10.*",
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              "version": "5.10.266",
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            {
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              "status": "unaffected",
              "version": "5.15.217",
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            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.184",
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            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.153",
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            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.105",
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            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.46",
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            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.266",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.217",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
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                  "versionStartIncluding": "5.6",
                  "vulnerable": true
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                {
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                {
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                  "vulnerable": true
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                {
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                  "vulnerable": true
                },
                {
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                {
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              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: options: reset DSS fields in case of unexpected size\n\nA remote peer could send a malformed DSS with a wrong size, followed by\nanother DSS or MPC + Data. In this case, the first suboption will be\nignored, but leaving some fields written, which could lead to\ninconsistency or access uninitialized data.\n\nExplicitly reset the fields that could have been modified in case of\nunexpected size."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - Remote attacker sends crafted TCP segments with malformed MPTCP options that are parsed in the softirq receive path (tcp_v4_rcv/tcp_rcv_established/tcp_data_queue/mptcp_incoming_options/mptcp_get_options), requiring only network reachability to an MPTCP-enabled peer.\nAC:L - Attacker fully controls TCP option bytes on an established MPTCP connection and can deterministically send a size-invalid DSS (setting use_ack/use_map flags) immediately followed by MPC+Data or another DSS in the same header; no race or victim-specific state is required.\nPR:N - Only requires the attacker to be the remote MPTCP/TCP peer of a host with CONFIG_MPTCP enabled; no local account, capabilities, or authenticated access on the victim is needed to reach the vulnerable parser.\nUI:N - Exploitation is fully automated over the network once an MPTCP session exists; the kernel processes malicious segments in softirq without any victim user action beyond ordinary connectivity.\nS:U - Impact is limited to kernel networking/MPTCP connection state on the affected host and does not cross VM, container, or IOMMU security boundaries.\nC:H - Malformed DSS leaves use_ack/use_map/dsn64/data_fin set while data_ack and map fields are never read, so ack_update_msk() and DSS handling consume uninitialized stack values and corrupt metadata that can leak kernel memory contents.\nI:H - Stale DSS flag bits cause forged ack advancement of msk-\u003esnd_una/wnd_end/bytes_acked and bogus DATA_FIN/DSN mapping in skb extensions, corrupting rtx queues and silently altering or truncating application data delivery.\nA:H - Bogus ack state triggers __mptcp_clean_una() WARN_ON_ONCE paths outside recovery, can abort or hang MPTCP connections, and may kernel-panic systems built with panic_on_warn."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-27T05:02:07.204Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/15e35fdad7a5576bf3f1c8d688877aeb5d1b506b"
        },
        {
          "url": "https://git.kernel.org/stable/c/b1256090816ec46011601e084be580731df58fc7"
        },
        {
          "url": "https://git.kernel.org/stable/c/192878df582c51d440bf7b91a15f297f29f2b596"
        },
        {
          "url": "https://git.kernel.org/stable/c/26dac5c9ffb20812b475fdf253eb04fab99cff3b"
        },
        {
          "url": "https://git.kernel.org/stable/c/4e80eff5c1c893aca2ac1d202f0b256d2e52ecde"
        },
        {
          "url": "https://git.kernel.org/stable/c/1fade1b2ac5b1a4948e538fae7313bea57b5ac36"
        },
        {
          "url": "https://git.kernel.org/stable/c/27ed642a4e7e4b5df4b8522c72c457a67e052493"
        },
        {
          "url": "https://git.kernel.org/stable/c/35772b4981f38ba8059372cde8753e8e477e98ec"
        }
      ],
      "title": "mptcp: options: reset DSS fields in case of unexpected size",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80586",
    "datePublished": "2026-08-26T14:37:41.493Z",
    "dateReserved": "2026-08-26T14:34:25.769Z",
    "dateUpdated": "2026-10-16T19:26:28.632Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}