CVE-2026-68479 (GCVE-0-2026-68479)
Vulnerability from cvelistv5
Published
2026-08-15 05:51
Modified
2026-08-17 05:39
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: db33c77dddc2ed2cff3061d0b096a9f5ab0c3647 Version: db33c77dddc2ed2cff3061d0b096a9f5ab0c3647 Version: db33c77dddc2ed2cff3061d0b096a9f5ab0c3647 Version: db33c77dddc2ed2cff3061d0b096a9f5ab0c3647 Version: db33c77dddc2ed2cff3061d0b096a9f5ab0c3647 Version: db33c77dddc2ed2cff3061d0b096a9f5ab0c3647 Version: db33c77dddc2ed2cff3061d0b096a9f5ab0c3647 Version: db33c77dddc2ed2cff3061d0b096a9f5ab0c3647 |
||
{
"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"
},
{
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"status": "affected",
"version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647",
"versionType": "git"
},
{
"lessThan": "68c5a2a19987c035eb129e627e579adafb04f637",
"status": "affected",
"version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647",
"versionType": "git"
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{
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"status": "affected",
"version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647",
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{
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"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
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{
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"status": "affected",
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}
]
},
{
"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:*:*:*:*:*:*:*:*",
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"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"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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