CVE-2026-43019
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync hci_conn lookup and field access must be covered by hdev lock in set_cig_params_sync, otherwise it's possible it is freed concurrently. Take hdev lock to prevent hci_conn from being deleted or modified concurrently. Just RCU lock is not suitable here, as we also want to avoid "tearing" in the configuration.
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-05-01 15:16:46.103000
Last modified
2026-10-19 20:18:00.497000
View original CVE JSON
{
"id": "CVE-2026-43019",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-05-01T15:16:46.103",
"lastModified": "2026-10-19T20:18:00.497",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: fix potential UAF in set_cig_params_sync\n\nhci_conn lookup and field access must be covered by hdev lock in\nset_cig_params_sync, otherwise it's possible it is freed concurrently.\n\nTake hdev lock to prevent hci_conn from being deleted or modified\nconcurrently. Just RCU lock is not suitable here, as we also want to\navoid \"tearing\" in the configuration."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"net/bluetooth/hci_conn.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "a091289218202bc09d9b9caa8afcde1018584aec",
"lessThan": "7502c1cf303b69f71d085f5ff7251b0e1b0f09df",
"versionType": "git",
"status": "affected"
},
{
"version": "a091289218202bc09d9b9caa8afcde1018584aec",
"lessThan": "66d432e9b45bae7881ffcdb12cd8fd0bf254ef02",
"versionType": "git",
"status": "affected"
},
{
"version": "a091289218202bc09d9b9caa8afcde1018584aec",
"lessThan": "7d568fede8eac91161a60b710aa920abe9b0fb9f",
"versionType": "git",
"status": "affected"
},
{
"version": "a091289218202bc09d9b9caa8afcde1018584aec",
"lessThan": "bad65b4b0a96139f023eadc28a33125963208449",
"versionType": "git",
"status": "affected"
},
{
"version": "a091289218202bc09d9b9caa8afcde1018584aec",
"lessThan": "a2639a7f0f5bf7d73f337f8f077c19415c62ed2c",
"versionType": "git",
"status": "affected"
},
{
"version": "3a273cd0f47dd672d37736e623849374f9ab9ce9",
"versionType": "git",
"status": "affected"
},
{
"version": "d8570c4c3f2a3e51b3c8b5e6ec898364c5c03062",
"versionType": "git",
"status": "affected"
},
{
"version": "6.4.16",
"lessThan": "6.5",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.5.3",
"lessThan": "6.6",
"versionType": "semver",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"net/bluetooth/hci_conn.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.6",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.6",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.143",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.81",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.22",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.19.12",
"lessThanOrEqual": "6.19.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.0",
"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
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-10-16T15:13:33.625290Z",
"id": "CVE-2026-43019",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "CWE-416"
}
]
},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-362"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.6",
"versionEndExcluding": "6.12.81",
"matchCriteriaId": "D467CA25-2A1E-475C-969E-62759720CE35"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.13",
"versionEndExcluding": "6.18.22",
"matchCriteriaId": "C9DF8BCE-36D3-475D-9D21-19E4F02F9029"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.19",
"versionEndExcluding": "6.19.12",
"matchCriteriaId": "0A2B9540-02D5-41B4-B16A-82AF66FD4F36"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:6.4.16:*:*:*:*:*:*:*",
"matchCriteriaId": "8E92AAEB-3511-43E8-B87A-8ECDD0F9A60C"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:6.5.3:*:*:*:*:*:*:*",
"matchCriteriaId": "82CFAFF6-0F05-40A4-B4A0-3140D6DD012F"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*",
"matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*",
"matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*",
"matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*",
"matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*",
"matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*",
"matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/66d432e9b45bae7881ffcdb12cd8fd0bf254ef02",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/7502c1cf303b69f71d085f5ff7251b0e1b0f09df",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7d568fede8eac91161a60b710aa920abe9b0fb9f",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/a2639a7f0f5bf7d73f337f8f077c19415c62ed2c",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/bad65b4b0a96139f023eadc28a33125963208449",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
}
]
}