CVE-2026-68479 (GCVE-0-2026-68479)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-08-17 05:39
VLAI
Title
Bluetooth: btrtl: validate firmware patch bounds
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btrtl: validate firmware patch bounds rtlbt_parse_firmware() copies patch_length - 4 bytes before appending the firmware version. A malformed firmware patch shorter than the version field can make this subtraction underflow and turn the copy into an oversized read and write during Bluetooth setup. The existing patch_offset + patch_length check can also wrap on 32-bit architectures. Validate the patch length and range without arithmetic overflow before allocating or copying the patch.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: db33c77dddc2ed2cff3061d0b096a9f5ab0c3647 , < 39e01b4addfbbe177567d6ed1dfb81f9cccb19e6 (git)
Affected: db33c77dddc2ed2cff3061d0b096a9f5ab0c3647 , < bda3c598ade6ea03884074b91e31608326684921 (git)
Affected: db33c77dddc2ed2cff3061d0b096a9f5ab0c3647 , < a4cb830e0b55ac76c849fd7840afb251f4c028fa (git)
Affected: db33c77dddc2ed2cff3061d0b096a9f5ab0c3647 , < 68c5a2a19987c035eb129e627e579adafb04f637 (git)
Affected: db33c77dddc2ed2cff3061d0b096a9f5ab0c3647 , < 83534891c058ed71e251135072640911670869aa (git)
Affected: db33c77dddc2ed2cff3061d0b096a9f5ab0c3647 , < 6744ab60dfac55d1df5733960aad5be300984301 (git)
Affected: db33c77dddc2ed2cff3061d0b096a9f5ab0c3647 , < f1ca750c0510bdbb504bf084d2f196ef2af92ea6 (git)
Affected: db33c77dddc2ed2cff3061d0b096a9f5ab0c3647 , < 609c5b04a28dc1b0f3af6a7bc93055135b2d2059 (git)
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Linux Linux Affected: 4.2
Unaffected: 0 , < 4.2 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "programFiles": [
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            }
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      "cpeApplicability": [
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                  "versionStartIncluding": "4.2",
                  "vulnerable": true
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                  "versionEndExcluding": "5.15.212",
                  "versionStartIncluding": "4.2",
                  "vulnerable": true
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                  "vulnerable": true
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                {
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                  "versionStartIncluding": "4.2",
                  "vulnerable": true
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                  "versionStartIncluding": "4.2",
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
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            "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 - 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:39:20.556Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/bda3c598ade6ea03884074b91e31608326684921"
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          "url": "https://git.kernel.org/stable/c/68c5a2a19987c035eb129e627e579adafb04f637"
        },
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          "url": "https://git.kernel.org/stable/c/83534891c058ed71e251135072640911670869aa"
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        {
          "url": "https://git.kernel.org/stable/c/609c5b04a28dc1b0f3af6a7bc93055135b2d2059"
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      "title": "Bluetooth: btrtl: validate firmware patch bounds",
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    "datePublished": "2026-08-15T05:51:34.106Z",
    "dateReserved": "2026-07-30T09:28:09.397Z",
    "dateUpdated": "2026-08-17T05:39:20.556Z",
    "state": "PUBLISHED"
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      "date": "2026-08-21",
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Validate the patch length and range without arithmetic\\noverflow before allocating or copying the patch.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/bluetooth/btrtl.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"db33c77dddc2ed2cff3061d0b096a9f5ab0c3647\",\"lessThan\":\"39e01b4addfbbe177567d6ed1dfb81f9cccb19e6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"db33c77dddc2ed2cff3061d0b096a9f5ab0c3647\",\"lessThan\":\"bda3c598ade6ea03884074b91e31608326684921\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"db33c77dddc2ed2cff3061d0b096a9f5ab0c3647\",\"lessThan\":\"a4cb830e0b55ac76c849fd7840afb251f4c028fa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"db33c77dddc2ed2cff3061d0b096a9f5ab0c3647\",\"lessThan\":\"68c5a2a19987c035eb129e627e579adafb04f637\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"db33c77dddc2ed2cff3061d0b096a9f5ab0c3647\",\"lessThan\":\"83534891c058ed71e251135072640911670869aa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"db33c77dddc2ed2cff3061d0b096a9f5ab0c3647\",\"lessThan\":\"6744ab60dfac55d1df5733960aad5be300984301\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"db33c77dddc2ed2cff3061d0b096a9f5ab0c3647\",\"lessThan\":\"f1ca750c0510bdbb504bf084d2f196ef2af92ea6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"db33c77dddc2ed2cff3061d0b096a9f5ab0c3647\",\"lessThan\":\"609c5b04a28dc1b0f3af6a7bc93055135b2d2059\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/bluetooth/btrtl.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.2\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.2\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"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:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/39e01b4addfbbe177567d6ed1dfb81f9cccb19e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/609c5b04a28dc1b0f3af6a7bc93055135b2d2059\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6744ab60dfac55d1df5733960aad5be300984301\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/68c5a2a19987c035eb129e627e579adafb04f637\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/83534891c058ed71e251135072640911670869aa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a4cb830e0b55ac76c849fd7840afb251f4c028fa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bda3c598ade6ea03884074b91e31608326684921\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f1ca750c0510bdbb504bf084d2f196ef2af92ea6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T16:05:03+00:00",
      "cve": "CVE-2026-68479",
      "id": "CVE-2026-68479",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: btrtl: validate firmware patch bounds",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68479.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.
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  • 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.