CVE-2026-99091 (GCVE-0-2026-99091)
Vulnerability from cvelistv5
Published
2026-10-26 14:52
Modified
2026-10-30 12:41
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: Fix status of pending commands flushed on power off cmd_complete_rsp() receives a struct cmd_lookup and, for a pending command that has no cmd_complete callback, falls through to cmd_status_rsp(cmd, data). cmd_status_rsp() reads data as a u8 *, so the status sent comes from the first byte of match->sk's representation, not from match->mgmt_status. commit f53e1c9c726d ("Bluetooth: MGMT: Fix possible crash on mgmt_index_removed") changed the callers' data from &status to &match and updated the cmd_complete branch to match->mgmt_status, but left the fall-through passing data unchanged. In mgmt_index_removed() match->sk is NULL, so every such command is answered with status 0x00 (Success) instead of MGMT_STATUS_INVALID_INDEX. In __mgmt_power_off() it is NULL too, unless a Set Powered command was pending: then settings_rsp() has stored that command's socket in match->sk, and the byte sent comes from the socket pointer. Either way the status the caller set, MGMT_STATUS_NOT_POWERED (or MGMT_STATUS_INVALID_INDEX when the device is being unregistered), is lost. Pass the status the callers set. This was seen on a QCA9377 laptop: bluetoothd's Start Discovery, pending when the adapter was powered off, was answered with Command Status 0x00 and no parameters, and bluetoothd 5.72 crashed on the zero-length success. BlueZ master has since added the length check on that path ("adapter: Fix crash on short start discovery reply", BlueZ a734b06059cb), but userspace should still be told Not Powered, not Success. Tested on Ubuntu 7.0.0-31 with a virtual controller (hci_vhci): power off is held in HCI Write Scan Enable while a Start Discovery is submitted, and the flush answers it with status 0x00 before this change and 0x0f (Not Powered) after.
References
Impacted products
Vendor Product Version
Linux Linux Version: 19b40ca62607cef78369549d1af091f2fd558931
Version: 4883296505aa7e4863c6869b689afb6005633b23
Version: f53e1c9c726d83092167f2226f32bd3b73f26c21
Version: f53e1c9c726d83092167f2226f32bd3b73f26c21
Version: f53e1c9c726d83092167f2226f32bd3b73f26c21
Version: f53e1c9c726d83092167f2226f32bd3b73f26c21
Version: 0cc47233af35fb5f10b5e6a027cb4ccd480caf9a
Version: 8c3f7943a29145d8a2d8e24893762f7673323eae
Version: 6.1.120   ≤
Version: 6.6.55   ≤
Version: 6.10.14   ≤
Version: 6.11.3   ≤
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{
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          "defaultStatus": "unaffected",
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          "programFiles": [
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          "product": "Linux",
          "programFiles": [
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      "cpeApplicability": [
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: MGMT: Fix status of pending commands flushed on power off\n\ncmd_complete_rsp() receives a struct cmd_lookup and, for a pending\ncommand that has no cmd_complete callback, falls through to\ncmd_status_rsp(cmd, data). cmd_status_rsp() reads data as a u8 *, so\nthe status sent comes from the first byte of match-\u003esk\u0027s\nrepresentation, not from match-\u003emgmt_status.\n\ncommit f53e1c9c726d (\"Bluetooth: MGMT: Fix possible crash on\nmgmt_index_removed\") changed the callers\u0027 data from \u0026status to \u0026match\nand updated the cmd_complete branch to match-\u003emgmt_status, but left\nthe fall-through passing data unchanged.\n\nIn mgmt_index_removed() match-\u003esk is NULL, so every such command is\nanswered with status 0x00 (Success) instead of\nMGMT_STATUS_INVALID_INDEX. In __mgmt_power_off() it is NULL too,\nunless a Set Powered command was pending: then settings_rsp() has\nstored that command\u0027s socket in match-\u003esk, and the byte sent comes\nfrom the socket pointer. Either way the status the caller set,\nMGMT_STATUS_NOT_POWERED (or MGMT_STATUS_INVALID_INDEX when the device\nis being unregistered), is lost.\n\nPass the status the callers set.\n\nThis was seen on a QCA9377 laptop: bluetoothd\u0027s Start Discovery,\npending when the adapter was powered off, was answered with Command\nStatus 0x00 and no parameters, and bluetoothd 5.72 crashed on the\nzero-length success. BlueZ master has since added the length check\non that path (\"adapter: Fix crash on short start discovery reply\",\nBlueZ a734b06059cb), but userspace should still be told Not Powered,\nnot Success.\n\nTested on Ubuntu 7.0.0-31 with a virtual controller (hci_vhci):\npower off is held in HCI Write Scan Enable while a Start Discovery is\nsubmitted, and the flush answers it with status 0x00 before this\nchange and 0x0f (Not Powered) after."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:41:41.779Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bbc485ee811a74fc1d4733d0a2b0eb5aeb271a08"
        },
        {
          "url": "https://git.kernel.org/stable/c/44ce36c5789ac84e65de1e98c32db9a5ac04ed47"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ed7e038b520cf0dfa12d61c2caddb95e2f6922d"
        },
        {
          "url": "https://git.kernel.org/stable/c/ec227cddd13cd7ac9077d263a73473ac370a055d"
        },
        {
          "url": "https://git.kernel.org/stable/c/07976405a3c71253e50533ee7b7a8b0dc16ab6ba"
        },
        {
          "url": "https://git.kernel.org/stable/c/86ef0f58bdecdedb3a1240971c56d71b7e4ce3fc"
        }
      ],
      "title": "Bluetooth: MGMT: Fix status of pending commands flushed on power off",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99091",
    "datePublished": "2026-10-26T14:52:00.262Z",
    "dateReserved": "2026-09-25T10:25:14.390Z",
    "dateUpdated": "2026-10-30T12:41:41.779Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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