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CVE-2026-98456

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: mgmt: fix race in read_unconf_index_list() read_unconf_index_list() counts unconfigured controllers before allocating its response, then checks the device flags again while filling it. hci_dev_list_lock stabilizes list membership, but it does not serialize the per-device flags. During asynchronous controller setup, the worker can set HCI_UNCONFIGURED and clear HCI_SETUP between the two passes. A controller omitted from the allocation count can then become eligible for the fill pass, causing an out-of-bounds write to rp->index[]. Allocate space for every device on hci_dev_list. Since list membership cannot change while hci_dev_list_lock is held, the response remains large enough regardless of flag transitions. The reported count and response length still include only eligible unconfigured controllers.

Severity
HIGH
CVSS score
7.0 (v3.1)
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-10-18 16:16:56.003000
Last modified
2026-10-30 13:21:14.533000
View original CVE JSON 
{
  "id": "CVE-2026-98456",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-10-18T16:16:56.003",
  "lastModified": "2026-10-30T13:21:14.533",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: mgmt: fix race in read_unconf_index_list()\n\nread_unconf_index_list() counts unconfigured controllers before allocating\nits response, then checks the device flags again while filling it.\n\nhci_dev_list_lock stabilizes list membership, but it does not serialize the\nper-device flags. During asynchronous controller setup, the worker can set\nHCI_UNCONFIGURED and clear HCI_SETUP between the two passes. A controller\nomitted from the allocation count can then become eligible for the fill\npass, causing an out-of-bounds write to rp->index[].\n\nAllocate space for every device on hci_dev_list. Since list membership\ncannot change while hci_dev_list_lock is held, the response remains large\nenough regardless of flag transitions. The reported count and response\nlength still include only eligible unconfigured controllers."
    }
  ],
  "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": "73d1df2a7a1036a1f000e5f0ece6ade3e082b854",
              "lessThan": "fa6f79bb0009406bb11e6912b53ab7c564d6f06b",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "73d1df2a7a1036a1f000e5f0ece6ade3e082b854",
              "lessThan": "76dc7e0297f6f7ebefc36a69251e3f4a676d9853",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "73d1df2a7a1036a1f000e5f0ece6ade3e082b854",
              "lessThan": "9c32455f490b960efccedd041c7aabb1a04c5cc4",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "73d1df2a7a1036a1f000e5f0ece6ade3e082b854",
              "lessThan": "524e0450dd9a396f99a81b045219b0e2ea0dab57",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "73d1df2a7a1036a1f000e5f0ece6ade3e082b854",
              "lessThan": "8ddf962c76432a10a6cb80042875cbc48a9c056b",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "73d1df2a7a1036a1f000e5f0ece6ade3e082b854",
              "lessThan": "416546cd6a54e9b68f2b91bc680b1ee17dcd77a1",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "73d1df2a7a1036a1f000e5f0ece6ade3e082b854",
              "lessThan": "2e8bba0360d1379bfa8da47c8f5dadbb10a3fba1",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "73d1df2a7a1036a1f000e5f0ece6ade3e082b854",
              "lessThan": "b5dbb41b212c50c095a4dbee3017a84fe94f033b",
              "versionType": "git",
              "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": "3.17",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "3.17",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.273",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.224",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.191",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.158",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.112",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.55",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.9",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.0,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "HIGH",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 5.9
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/2e8bba0360d1379bfa8da47c8f5dadbb10a3fba1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/416546cd6a54e9b68f2b91bc680b1ee17dcd77a1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/524e0450dd9a396f99a81b045219b0e2ea0dab57",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/76dc7e0297f6f7ebefc36a69251e3f4a676d9853",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8ddf962c76432a10a6cb80042875cbc48a9c056b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9c32455f490b960efccedd041c7aabb1a04c5cc4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b5dbb41b212c50c095a4dbee3017a84fe94f033b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fa6f79bb0009406bb11e6912b53ab7c564d6f06b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}