Vulnerability-Lookup

GHSA-2GQ6-HG5J-367V

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-68479"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:20:51Z",
    "severity": "HIGH"
  },
  "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.",
  "id": "GHSA-2gq6-hg5j-367v",
  "modified": "2026-08-17T06:33:03Z",
  "published": "2026-08-15T06:32:08Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68479"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/39e01b4addfbbe177567d6ed1dfb81f9cccb19e6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/609c5b04a28dc1b0f3af6a7bc93055135b2d2059"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6744ab60dfac55d1df5733960aad5be300984301"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/68c5a2a19987c035eb129e627e579adafb04f637"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/83534891c058ed71e251135072640911670869aa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a4cb830e0b55ac76c849fd7840afb251f4c028fa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bda3c598ade6ea03884074b91e31608326684921"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f1ca750c0510bdbb504bf084d2f196ef2af92ea6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-08-17 05:39

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

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/39e01b4addfbbe177…
https://git.kernel.org/stable/c/bda3c598ade6ea038…
https://git.kernel.org/stable/c/a4cb830e0b55ac76c…
https://git.kernel.org/stable/c/68c5a2a19987c035e…
https://git.kernel.org/stable/c/83534891c058ed71e…
https://git.kernel.org/stable/c/6744ab60dfac55d1d…
https://git.kernel.org/stable/c/f1ca750c0510bdbb5…
https://git.kernel.org/stable/c/609c5b04a28dc1b0f…

Impacted products

2 products

Vendor	Product	Version
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)
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)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/bluetooth/btrtl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "39e01b4addfbbe177567d6ed1dfb81f9cccb19e6",
              "status": "affected",
              "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647",
              "versionType": "git"
            },
            {
              "lessThan": "bda3c598ade6ea03884074b91e31608326684921",
              "status": "affected",
              "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647",
              "versionType": "git"
            },
            {
              "lessThan": "a4cb830e0b55ac76c849fd7840afb251f4c028fa",
              "status": "affected",
              "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647",
              "versionType": "git"
            },
            {
              "lessThan": "68c5a2a19987c035eb129e627e579adafb04f637",
              "status": "affected",
              "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647",
              "versionType": "git"
            },
            {
              "lessThan": "83534891c058ed71e251135072640911670869aa",
              "status": "affected",
              "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647",
              "versionType": "git"
            },
            {
              "lessThan": "6744ab60dfac55d1df5733960aad5be300984301",
              "status": "affected",
              "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647",
              "versionType": "git"
            },
            {
              "lessThan": "f1ca750c0510bdbb504bf084d2f196ef2af92ea6",
              "status": "affected",
              "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647",
              "versionType": "git"
            },
            {
              "lessThan": "609c5b04a28dc1b0f3af6a7bc93055135b2d2059",
              "status": "affected",
              "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/bluetooth/btrtl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.2"
            },
            {
              "lessThan": "4.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.261",
                  "versionStartIncluding": "4.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.212",
                  "versionStartIncluding": "4.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
                  "versionStartIncluding": "4.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "4.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "4.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "4.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "4.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "4.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "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"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/39e01b4addfbbe177567d6ed1dfb81f9cccb19e6"
        },
        {
          "url": "https://git.kernel.org/stable/c/bda3c598ade6ea03884074b91e31608326684921"
        },
        {
          "url": "https://git.kernel.org/stable/c/a4cb830e0b55ac76c849fd7840afb251f4c028fa"
        },
        {
          "url": "https://git.kernel.org/stable/c/68c5a2a19987c035eb129e627e579adafb04f637"
        },
        {
          "url": "https://git.kernel.org/stable/c/83534891c058ed71e251135072640911670869aa"
        },
        {
          "url": "https://git.kernel.org/stable/c/6744ab60dfac55d1df5733960aad5be300984301"
        },
        {
          "url": "https://git.kernel.org/stable/c/f1ca750c0510bdbb504bf084d2f196ef2af92ea6"
        },
        {
          "url": "https://git.kernel.org/stable/c/609c5b04a28dc1b0f3af6a7bc93055135b2d2059"
        }
      ],
      "title": "Bluetooth: btrtl: validate firmware patch bounds",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68479",
    "datePublished": "2026-08-15T05:51:34.106Z",
    "dateReserved": "2026-07-30T09:28:09.397Z",
    "dateUpdated": "2026-08-17T05:39:20.556Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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GHSA-2GQ6-HG5J-367V

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

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Sightings

Nomenclature