CVE-2026-98456 (GCVE-0-2026-98456)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:15 – Updated: 2026-10-30 12:38
VLAI
Title
Bluetooth: mgmt: fix race in read_unconf_index_list()
Summary
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
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 73d1df2a7a1036a1f000e5f0ece6ade3e082b854 , < fa6f79bb0009406bb11e6912b53ab7c564d6f06b (git)
Affected: 73d1df2a7a1036a1f000e5f0ece6ade3e082b854 , < 76dc7e0297f6f7ebefc36a69251e3f4a676d9853 (git)
Affected: 73d1df2a7a1036a1f000e5f0ece6ade3e082b854 , < 9c32455f490b960efccedd041c7aabb1a04c5cc4 (git)
Affected: 73d1df2a7a1036a1f000e5f0ece6ade3e082b854 , < 524e0450dd9a396f99a81b045219b0e2ea0dab57 (git)
Affected: 73d1df2a7a1036a1f000e5f0ece6ade3e082b854 , < 8ddf962c76432a10a6cb80042875cbc48a9c056b (git)
Affected: 73d1df2a7a1036a1f000e5f0ece6ade3e082b854 , < 416546cd6a54e9b68f2b91bc680b1ee17dcd77a1 (git)
Affected: 73d1df2a7a1036a1f000e5f0ece6ade3e082b854 , < 2e8bba0360d1379bfa8da47c8f5dadbb10a3fba1 (git)
Affected: 73d1df2a7a1036a1f000e5f0ece6ade3e082b854 , < b5dbb41b212c50c095a4dbee3017a84fe94f033b (git)
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Linux Linux Affected: 3.17
Unaffected: 0 , < 3.17 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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        }
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              "value": "AV:L - sendmsg() on a local PF_BLUETOOTH/BTPROTO_HCI socket bound to HCI_CHANNEL_CONTROL reaches hci_sock_sendmsg()-\u003ehci_mgmt_cmd()-\u003eread_unconf_index_list(). No over-the-air Bluetooth message supplies this management command or the corrupted data.\nAC:H - The overwrite requires the setup worker to set HCI_UNCONFIGURED and clear HCI_SETUP between read_unconf_index_list()\u0027s sizing and filling walks. An untrusted management-socket caller cannot initiate or synchronize that controller-setup transition, so success depends on external timing.\nPR:L - mgmt_handlers[] marks MGMT_OP_READ_UNCONF_INDEX_LIST with HCI_MGMT_UNTRUSTED, and hci_sock_bind() permits HCI_CHANNEL_CONTROL binding without CAP_NET_ADMIN. Therefore any local user can issue the zero-length command.\nUI:N - The attacker can repeatedly send the management command without another user opening data or approving an operation; asynchronous controller setup is system state rather than required user interaction.\nS:U - The allocation and rp-\u003eindex[] overwrite occur in read_unconf_index_list() within the host kernel heap, and no VM, IOMMU, or other security-authority boundary is crossed.\nC:H - When a newly eligible controller exceeds the allocation basis, rp-\u003eindex[count++] writes 16-bit IDs past the kmalloc buffer and corrupts adjacent kernel heap storage; exploitable heap corruption can expose arbitrary kernel data.\nI:H - rp-\u003eindex[count++] performs an out-of-bounds heap write for each newly eligible controller, allowing adjacent kernel objects to be modified and potentially enabling control-flow hijacking.\nA:H - The out-of-bounds writes can corrupt allocator or adjacent-object state and cause a kernel oops or panic, resulting in complete host availability loss."
            }
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          }
        ],
        "id": "CVE-2026-98456",
        "lastModified": "2026-10-30T13:21:14.533",
        "metrics": {
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              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.0,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.0,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
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        "published": "2026-10-18T16:16:56.003",
        "references": [
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fa6f79bb0009406bb11e6912b53ab7c564d6f06b"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-30T07:00:40+00:00",
      "cve": "CVE-2026-98456",
      "id": "CVE-2026-98456",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_affected": "237",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: mgmt: fix race in read_unconf_index_list()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98456.json",
      "version": "3"
    }
  }
}



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