FKIE_CVE-2026-74302

Vulnerability from fkie_nvd - Published: 2026-08-15 06:22 - Updated: 2026-08-17 06:19
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_core: Fix UAF in hci_unregister_dev() hci_unregister_dev() does not disable cmd_timer and ncmd_timer before the hci_dev structure is freed. If a timeout fires during device teardown, the callback dereferences freed memory (including the hdev->reset function pointer), leading to a use-after-free. Add disable_delayed_work_sync() calls alongside the existing disable_work_sync() calls to ensure both timers are fully quiesced before teardown proceeds.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/48c7ad6afcc58c2cda11fed39791708103b6a644
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5edcc018fa6e80b2c478454a4a8229c23d67c181
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/672d52d9412252e61b8de8d773ccdf5a277cf540
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a0fd1086a57b982f8c24ae4ab165c2af39fe1735
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "48c7ad6afcc58c2cda11fed39791708103b6a644",
              "status": "affected",
              "version": "0d151a103775dd9645c78c97f77d6e2a5298d913",
              "versionType": "git"
            },
            {
              "lessThan": "a0fd1086a57b982f8c24ae4ab165c2af39fe1735",
              "status": "affected",
              "version": "0d151a103775dd9645c78c97f77d6e2a5298d913",
              "versionType": "git"
            },
            {
              "lessThan": "672d52d9412252e61b8de8d773ccdf5a277cf540",
              "status": "affected",
              "version": "0d151a103775dd9645c78c97f77d6e2a5298d913",
              "versionType": "git"
            },
            {
              "lessThan": "5edcc018fa6e80b2c478454a4a8229c23d67c181",
              "status": "affected",
              "version": "0d151a103775dd9645c78c97f77d6e2a5298d913",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "48542881997e17b49dc16b93fe910e0cfcf7a9f9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9cfc84b1d464cc024286f42a090718f9067b80ed",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ddeda6ca5f218b668b560d90fc31ae469adbfd92",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d2ce562a5aff1dcd0c50d9808ea825ef90da909f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "96600c2e5ee8213dbab5df1617293d8e847bb4fa",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d6cbce18370641a21dd889e8613d8153df15eb39",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3f939bd73fed12dddc2a32a76116c19ca47c7678",
              "versionType": "git"
            },
            {
              "lessThan": "4.20",
              "status": "affected",
              "version": "4.19.319",
              "versionType": "semver"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.281",
              "versionType": "semver"
            },
            {
              "lessThan": "5.11",
              "status": "affected",
              "version": "5.10.223",
              "versionType": "semver"
            },
            {
              "lessThan": "5.16",
              "status": "affected",
              "version": "5.15.164",
              "versionType": "semver"
            },
            {
              "lessThan": "6.2",
              "status": "affected",
              "version": "6.1.101",
              "versionType": "semver"
            },
            {
              "lessThan": "6.7",
              "status": "affected",
              "version": "6.6.42",
              "versionType": "semver"
            },
            {
              "lessThan": "6.10",
              "status": "affected",
              "version": "6.9.11",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_core: Fix UAF in hci_unregister_dev()\n\nhci_unregister_dev() does not disable cmd_timer and ncmd_timer\nbefore the hci_dev structure is freed. If a timeout fires\nduring device teardown, the callback dereferences freed memory\n(including the hdev-\u003ereset function pointer), leading to a\nuse-after-free.\n\nAdd disable_delayed_work_sync() calls alongside the existing\ndisable_work_sync() calls to ensure both timers are fully\nquiesced before teardown proceeds."
    }
  ],
  "id": "CVE-2026-74302",
  "lastModified": "2026-08-17T06:19:24.323",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-15T06:22:29.813",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/48c7ad6afcc58c2cda11fed39791708103b6a644"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5edcc018fa6e80b2c478454a4a8229c23d67c181"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/672d52d9412252e61b8de8d773ccdf5a277cf540"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a0fd1086a57b982f8c24ae4ab165c2af39fe1735"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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