{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68479",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-68479"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "Bluetooth: btrtl: validate firmware patch bounds",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btrtl: validate firmware patch bounds\n\nrtlbt_parse_firmware() copies patch_length - 4 bytes before appending the\nfirmware version. A malformed firmware patch shorter than the version field\ncan make this subtraction underflow and turn the copy into an oversized\nread and write during Bluetooth setup.\n\nThe existing patch_offset + patch_length check can also wrap on 32-bit\narchitectures. Validate the patch length and range without arithmetic\noverflow before allocating or copying the patch.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "upstream_fixed": "6.18.40"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-68479"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/39e01b4addfbbe177567d6ed1dfb81f9cccb19e6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bda3c598ade6ea03884074b91e31608326684921"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a4cb830e0b55ac76c849fd7840afb251f4c028fa"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/68c5a2a19987c035eb129e627e579adafb04f637"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/83534891c058ed71e251135072640911670869aa"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6744ab60dfac55d1df5733960aad5be300984301"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f1ca750c0510bdbb504bf084d2f196ef2af92ea6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/609c5b04a28dc1b0f3af6a7bc93055135b2d2059"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Malformed input is parsed from host firmware files via request_firmware() during Realtek Bluetooth hci_power_on/setup (btusb_setup_realtek or h5_btrtl_setup \u2192 btrtl_initialize \u2192 rtlbt_parse_firmware); no network or Bluetooth packet path reaches this parser.\nAC:L - Attacker fully controls EPATCH patch_length and patch_offset in a crafted firmware blob; unsigned underflow of patch_length-4 and 32-bit patch_offset+patch_length wrap reliably trigger oversized memcpy on the next adapter power-on without races or attacker-uncontrolled layout.\nPR:L - Firmware is loaded from /lib/firmware/rtl_bt/ or Android /vendor/firmware/ paths that on many embedded and phone builds are writable by non-root system or vendor accounts; no init-namespace administrator privileges are needed to position the malicious EPATCH image.\nUI:N - rtlbt_parse_firmware runs automatically from hci_dev_setup_sync during hci_power_on when Realtek Bluetooth is enabled at boot or by bluetoothd, requiring no victim interaction such as pairing, mounting, or accepting prompts.\nS:U - Heap corruption and out-of-bounds access occur entirely within kernel memory during local firmware parsing on the same host; this does not cross VM, container, or IOMMU security boundaries.\nC:H - patch_length-4 unsigned underflow turns memcpy into a massive out-of-bounds read past the kvmemdup firmware buffer, exposing adjacent kernel heap or vmalloc contents well beyond any bounded leak.\nI:H - The same undersized patch_length allocates a small kvmalloc buffer then memcpy writes a huge amount into kernel heap, yielding a controllable heap overflow and out-of-bounds write usable for privilege escalation.\nA:H - Heap overflow and out-of-range copies during Bluetooth setup commonly cause kernel oops or panic; even without full exploitation the bug produces immediate high availability impact on affected Realtek adapters."
    }
  }
}