Vulnerability-Lookup

GHSA-7HQ2-XWXM-F2G8

Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-23 15:33

Details

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: mgmt: fix UAF in pair command cancellation

The pairing completion and authentication failure callbacks look up the pending MGMT_OP_PAIR_DEVICE command by walking hdev->mgmt_pending. The lookup returned a command that was still linked on the shared pending list, without keeping mgmt_pending_lock held for the later dereference and removal.

A concurrent MGMT_OP_CANCEL_PAIR_DEVICE request can remove and free the same pending command before the callback uses it. The reverse race is also possible when cancel_pair_device() gets a command from pending_find() and a callback removes it before the cancel path dereferences it. This can lead to a use-after-free and a second list_del().

Make the pairing lookup helpers transfer ownership of the pending command by removing it from hdev->mgmt_pending while holding mgmt_pending_lock. The callbacks and cancel path then complete the command and free it directly, so racing paths cannot find or free the same command again. Take a temporary hci_conn reference in cancel_pair_device() because the command completion drops the reference stored in the pending command.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74510"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T13:17:56Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-7hq2-xwxm-f2g8",
  "modified": "2026-08-23T15:33:02Z",
  "published": "2026-08-15T15:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74510"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/50af4280a587c9971b5388cbc438f1324e626b7b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/51be7280980fddc90ebe874a69c2fe8ab02bb46a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7c2a152a897cd1c184b2051484d4f74d803e7f4a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/86ed4dd6548ccf277bc691bc912ca06e76b9d80c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c569def320aa8b1fde89227e2ea96606790fd86d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d0a7b48ad0921bd88effaee10bf970ab1d5d0ddd"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74510 (GCVE-0-2026-74510)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-23 12:47

Title

Bluetooth: mgmt: fix UAF in pair command cancellation

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: mgmt: fix UAF in pair command cancellation The pairing completion and authentication failure callbacks look up the pending MGMT_OP_PAIR_DEVICE command by walking hdev->mgmt_pending. The lookup returned a command that was still linked on the shared pending list, without keeping mgmt_pending_lock held for the later dereference and removal. A concurrent MGMT_OP_CANCEL_PAIR_DEVICE request can remove and free the same pending command before the callback uses it. The reverse race is also possible when cancel_pair_device() gets a command from pending_find() and a callback removes it before the cancel path dereferences it. This can lead to a use-after-free and a second list_del(). Make the pairing lookup helpers transfer ownership of the pending command by removing it from hdev->mgmt_pending while holding mgmt_pending_lock. The callbacks and cancel path then complete the command and free it directly, so racing paths cannot find or free the same command again. Take a temporary hci_conn reference in cancel_pair_device() because the command completion drops the reference stored in the pending command.

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 mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/50af4280a587c9971…
https://git.kernel.org/stable/c/86ed4dd6548ccf277…
https://git.kernel.org/stable/c/7c2a152a897cd1c18…
https://git.kernel.org/stable/c/c569def320aa8b1fd…
https://git.kernel.org/stable/c/51be7280980fddc90…
https://git.kernel.org/stable/c/d0a7b48ad0921bd88…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: e9a416b5ce0c0f93819f55d34cf6882196e9c3b2 , < 50af4280a587c9971b5388cbc438f1324e626b7b (git) Affected: e9a416b5ce0c0f93819f55d34cf6882196e9c3b2 , < 86ed4dd6548ccf277bc691bc912ca06e76b9d80c (git) Affected: e9a416b5ce0c0f93819f55d34cf6882196e9c3b2 , < 7c2a152a897cd1c184b2051484d4f74d803e7f4a (git) Affected: e9a416b5ce0c0f93819f55d34cf6882196e9c3b2 , < c569def320aa8b1fde89227e2ea96606790fd86d (git) Affected: e9a416b5ce0c0f93819f55d34cf6882196e9c3b2 , < 51be7280980fddc90ebe874a69c2fe8ab02bb46a (git) Affected: e9a416b5ce0c0f93819f55d34cf6882196e9c3b2 , < d0a7b48ad0921bd88effaee10bf970ab1d5d0ddd (git)
Linux	Linux	Affected: 2.6.39 Unaffected: 0 , < 2.6.39 (semver) Unaffected: 6.1.184 , ≤ 6.1.* (semver) Unaffected: 6.6.151 , ≤ 6.6.* (semver) Unaffected: 6.12.103 , ≤ 6.12.* (semver) Unaffected: 6.18.44 , ≤ 6.18.* (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/mgmt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "50af4280a587c9971b5388cbc438f1324e626b7b",
              "status": "affected",
              "version": "e9a416b5ce0c0f93819f55d34cf6882196e9c3b2",
              "versionType": "git"
            },
            {
              "lessThan": "86ed4dd6548ccf277bc691bc912ca06e76b9d80c",
              "status": "affected",
              "version": "e9a416b5ce0c0f93819f55d34cf6882196e9c3b2",
              "versionType": "git"
            },
            {
              "lessThan": "7c2a152a897cd1c184b2051484d4f74d803e7f4a",
              "status": "affected",
              "version": "e9a416b5ce0c0f93819f55d34cf6882196e9c3b2",
              "versionType": "git"
            },
            {
              "lessThan": "c569def320aa8b1fde89227e2ea96606790fd86d",
              "status": "affected",
              "version": "e9a416b5ce0c0f93819f55d34cf6882196e9c3b2",
              "versionType": "git"
            },
            {
              "lessThan": "51be7280980fddc90ebe874a69c2fe8ab02bb46a",
              "status": "affected",
              "version": "e9a416b5ce0c0f93819f55d34cf6882196e9c3b2",
              "versionType": "git"
            },
            {
              "lessThan": "d0a7b48ad0921bd88effaee10bf970ab1d5d0ddd",
              "status": "affected",
              "version": "e9a416b5ce0c0f93819f55d34cf6882196e9c3b2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/mgmt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.39"
            },
            {
              "lessThan": "2.6.39",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.184",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.184",
                  "versionStartIncluding": "2.6.39",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.151",
                  "versionStartIncluding": "2.6.39",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.103",
                  "versionStartIncluding": "2.6.39",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.44",
                  "versionStartIncluding": "2.6.39",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "2.6.39",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "2.6.39",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:47:31.049Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/50af4280a587c9971b5388cbc438f1324e626b7b"
        },
        {
          "url": "https://git.kernel.org/stable/c/86ed4dd6548ccf277bc691bc912ca06e76b9d80c"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c2a152a897cd1c184b2051484d4f74d803e7f4a"
        },
        {
          "url": "https://git.kernel.org/stable/c/c569def320aa8b1fde89227e2ea96606790fd86d"
        },
        {
          "url": "https://git.kernel.org/stable/c/51be7280980fddc90ebe874a69c2fe8ab02bb46a"
        },
        {
          "url": "https://git.kernel.org/stable/c/d0a7b48ad0921bd88effaee10bf970ab1d5d0ddd"
        }
      ],
      "title": "Bluetooth: mgmt: fix UAF in pair command cancellation",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74510",
    "datePublished": "2026-08-15T12:27:32.503Z",
    "dateReserved": "2026-08-15T05:44:03.909Z",
    "dateUpdated": "2026-08-23T12:47:31.049Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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GHSA-7HQ2-XWXM-F2G8

CVE-2026-74510 (GCVE-0-2026-74510)

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Nomenclature