CVE-2026-99091

Full vulnerability record from the local CVENow database.

Description

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.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-10-26 15:16:47.960000

Last modified

2026-10-30 13:21:44.810000

View original CVE JSON

{
  "id": "CVE-2026-99091",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-10-26T15:16:47.960",
  "lastModified": "2026-10-30T13:21:44.810",
  "vulnStatus": "Received",
  "cveTags": [],
  "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->sk's\nrepresentation, not from match->mgmt_status.\n\ncommit f53e1c9c726d (\"Bluetooth: MGMT: Fix possible crash on\nmgmt_index_removed\") changed the callers' data from &status to &match\nand updated the cmd_complete branch to match->mgmt_status, but left\nthe fall-through passing data unchanged.\n\nIn mgmt_index_removed() match->sk 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's socket in match->sk, 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's 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."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "net/bluetooth/mgmt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "19b40ca62607cef78369549d1af091f2fd558931",
              "lessThan": "bbc485ee811a74fc1d4733d0a2b0eb5aeb271a08",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4883296505aa7e4863c6869b689afb6005633b23",
              "lessThan": "44ce36c5789ac84e65de1e98c32db9a5ac04ed47",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "f53e1c9c726d83092167f2226f32bd3b73f26c21",
              "lessThan": "7ed7e038b520cf0dfa12d61c2caddb95e2f6922d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "f53e1c9c726d83092167f2226f32bd3b73f26c21",
              "lessThan": "ec227cddd13cd7ac9077d263a73473ac370a055d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "f53e1c9c726d83092167f2226f32bd3b73f26c21",
              "lessThan": "07976405a3c71253e50533ee7b7a8b0dc16ab6ba",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "f53e1c9c726d83092167f2226f32bd3b73f26c21",
              "lessThan": "86ef0f58bdecdedb3a1240971c56d71b7e4ce3fc",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "0cc47233af35fb5f10b5e6a027cb4ccd480caf9a",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "8c3f7943a29145d8a2d8e24893762f7673323eae",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "6.1.120",
              "lessThan": "6.1.191",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.6.55",
              "lessThan": "6.6.160",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.10.14",
              "lessThan": "6.11",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.11.3",
              "lessThan": "6.12",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "net/bluetooth/mgmt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.12",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.12",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.191",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.160",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.113",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.57",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.11",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/07976405a3c71253e50533ee7b7a8b0dc16ab6ba",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/44ce36c5789ac84e65de1e98c32db9a5ac04ed47",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7ed7e038b520cf0dfa12d61c2caddb95e2f6922d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/86ef0f58bdecdedb3a1240971c56d71b7e4ce3fc",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bbc485ee811a74fc1d4733d0a2b0eb5aeb271a08",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ec227cddd13cd7ac9077d263a73473ac370a055d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}