{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68479", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.397Z", "datePublished": "2026-08-15T05:51:34.106Z", "dateUpdated": "2026-10-16T15:53:15.358Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:39:20.556Z" }, "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": { "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" }, "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 → btrtl_initialize → 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/bluetooth/btrtl.c" ], "versions": [ { "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647", "lessThan": "39e01b4addfbbe177567d6ed1dfb81f9cccb19e6", "status": "affected", "versionType": "git" }, { "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647", "lessThan": "bda3c598ade6ea03884074b91e31608326684921", "status": "affected", "versionType": "git" }, { "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647", "lessThan": "a4cb830e0b55ac76c849fd7840afb251f4c028fa", "status": "affected", "versionType": "git" }, { "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647", "lessThan": "68c5a2a19987c035eb129e627e579adafb04f637", "status": "affected", "versionType": "git" }, { "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647", "lessThan": "83534891c058ed71e251135072640911670869aa", "status": "affected", "versionType": "git" }, { "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647", "lessThan": "6744ab60dfac55d1df5733960aad5be300984301", "status": "affected", "versionType": "git" }, { "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647", "lessThan": "f1ca750c0510bdbb504bf084d2f196ef2af92ea6", "status": "affected", "versionType": "git" }, { "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647", "lessThan": "609c5b04a28dc1b0f3af6a7bc93055135b2d2059", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/bluetooth/btrtl.c" ], "versions": [ { "version": "4.2", "status": "affected" }, { "version": "0", "lessThan": "4.2", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "7.2" } ] } ] } ], "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" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-68479", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T15:49:41.950928Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:53:15.358Z" } } ] } }