CVE-2026-31500
Estado: ModificadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: btintel: serialize btintel_hw_error() with hci_req_sync_lock
btintel_hw_error() issues two __hci_cmd_sync() calls (HCI_OP_RESET and Intel exception-info retrieval) without holding hci_req_sync_lock(). This lets it race against hci_dev_do_close() -> btintel_shutdown_combined(), which also runs __hci_cmd_sync() under the same lock. When both paths manipulate hdev->req_status/req_rsp concurrently, the close path may free the response skb first, and the still-running hw_error path hits a slab-use-after-free in kfree_skb().
Leer descripción completaMostrar menos
Wrap the whole recovery sequence in hci_req_sync_lock/unlock so it is serialized with every other synchronous HCI command issuer.
Below is the data race report and the kasan report:
Detalles técnicos trazas, registros y código del informe original
BUG: data-race in __hci_cmd_sync_sk / btintel_shutdown_combined
read of hdev->req_rsp at net/bluetooth/hci_sync.c:199
by task kworker/u17:1/83:
__hci_cmd_sync_sk+0x12f2/0x1c30 net/bluetooth/hci_sync.c:200
__hci_cmd_sync+0x55/0x80 net/bluetooth/hci_sync.c:223
btintel_hw_error+0x114/0x670 drivers/bluetooth/btintel.c:254
hci_error_reset+0x348/0xa30 net/bluetooth/hci_core.c:1030
write/free by task ioctl/22580:
btintel_shutdown_combined+0xd0/0x360
drivers/bluetooth/btintel.c:3648
hci_dev_close_sync+0x9ae/0x2c10 net/bluetooth/hci_sync.c:5246
hci_dev_do_close+0x232/0x460 net/bluetooth/hci_core.c:526
BUG: KASAN: slab-use-after-free in
sk_skb_reason_drop+0x43/0x380 net/core/skbuff.c:1202
Read of size 4 at addr ffff888144a738dc
by task kworker/u17:1/83:
__hci_cmd_sync_sk+0x12f2/0x1c30 net/bluetooth/hci_sync.c:200
__hci_cmd_sync+0x55/0x80 net/bluetooth/hci_sync.c:223
btintel_hw_error+0x186/0x670 drivers/bluetooth/btintel.c:260CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 7.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.17%
- Percentil entre todas las CVEs puntuadas: 6
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation85 % - Impacto principal
T1059Command and Scripting Interpreterexecution75 %
AV:L PR:L: acceso local con privilegios requiere escalada. Race condition en Bluetooth puede permitir ejecución de código con KASAN slab-use-after-free.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- CWE-416
Referencias
- https://git.kernel.org/stable/c/5f84e845648dfa86e42de5487f1a774b42f0444d
- https://git.kernel.org/stable/c/66696648af477dc87859e5e4b607112f5f29d010
- https://git.kernel.org/stable/c/7e041d0aad1d4d43d921ace052e04f4e2cacaed3
- https://git.kernel.org/stable/c/94d8e6fe5d0818e9300e514e095a200bd5ff93ae
- https://git.kernel.org/stable/c/e10a4cb72468686ffbe8bb2b0520e37f6be1a0c5
- https://git.kernel.org/stable/c/f7d84737663ad4a120d2d8ef1561a4df91282c2e
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-31500",
"cveTags": [],
"metrics": {
"cvssMetricV31": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.8,
"attackVector": "LOCAL",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.9,
"exploitabilityScore": 1.8
}
]
},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "973bb97e5aee56edddaae3d5c96877101ad509c0",
"lessThan": "7e041d0aad1d4d43d921ace052e04f4e2cacaed3",
"versionType": "git"
},
{
"status": "affected",
"version": "973bb97e5aee56edddaae3d5c96877101ad509c0",
"lessThan": "5f84e845648dfa86e42de5487f1a774b42f0444d",
"versionType": "git"
},
{
"status": "affected",
"version": "973bb97e5aee56edddaae3d5c96877101ad509c0",
"lessThan": "e10a4cb72468686ffbe8bb2b0520e37f6be1a0c5",
"versionType": "git"
},
{
"status": "affected",
"version": "973bb97e5aee56edddaae3d5c96877101ad509c0",
"lessThan": "66696648af477dc87859e5e4b607112f5f29d010",
"versionType": "git"
},
{
"status": "affected",
"version": "973bb97e5aee56edddaae3d5c96877101ad509c0",
"lessThan": "f7d84737663ad4a120d2d8ef1561a4df91282c2e",
"versionType": "git"
},
{
"status": "affected",
"version": "973bb97e5aee56edddaae3d5c96877101ad509c0",
"lessThan": "94d8e6fe5d0818e9300e514e095a200bd5ff93ae",
"versionType": "git"
}
],
"programFiles": [
"drivers/bluetooth/btintel.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.3"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.131",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.80",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.21",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.11",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/bluetooth/btintel.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-04-22T14:16:48.427",
"references": [
{
"url": "https://git.kernel.org/stable/c/5f84e845648dfa86e42de5487f1a774b42f0444d",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/66696648af477dc87859e5e4b607112f5f29d010",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7e041d0aad1d4d43d921ace052e04f4e2cacaed3",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/94d8e6fe5d0818e9300e514e095a200bd5ff93ae",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e10a4cb72468686ffbe8bb2b0520e37f6be1a0c5",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f7d84737663ad4a120d2d8ef1561a4df91282c2e",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-416"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btintel: serialize btintel_hw_error() with hci_req_sync_lock\n\nbtintel_hw_error() issues two __hci_cmd_sync() calls (HCI_OP_RESET\nand Intel exception-info retrieval) without holding\nhci_req_sync_lock(). This lets it race against\nhci_dev_do_close() -> btintel_shutdown_combined(), which also runs\n__hci_cmd_sync() under the same lock. When both paths manipulate\nhdev->req_status/req_rsp concurrently, the close path may free the\nresponse skb first, and the still-running hw_error path hits a\nslab-use-after-free in kfree_skb().\n\nWrap the whole recovery sequence in hci_req_sync_lock/unlock so it\nis serialized with every other synchronous HCI command issuer.\n\nBelow is the data race report and the kasan report:\n\n BUG: data-race in __hci_cmd_sync_sk / btintel_shutdown_combined\n\n read of hdev->req_rsp at net/bluetooth/hci_sync.c:199\n by task kworker/u17:1/83:\n __hci_cmd_sync_sk+0x12f2/0x1c30 net/bluetooth/hci_sync.c:200\n __hci_cmd_sync+0x55/0x80 net/bluetooth/hci_sync.c:223\n btintel_hw_error+0x114/0x670 drivers/bluetooth/btintel.c:254\n hci_error_reset+0x348/0xa30 net/bluetooth/hci_core.c:1030\n\n write/free by task ioctl/22580:\n btintel_shutdown_combined+0xd0/0x360\n drivers/bluetooth/btintel.c:3648\n hci_dev_close_sync+0x9ae/0x2c10 net/bluetooth/hci_sync.c:5246\n hci_dev_do_close+0x232/0x460 net/bluetooth/hci_core.c:526\n\n BUG: KASAN: slab-use-after-free in\n sk_skb_reason_drop+0x43/0x380 net/core/skbuff.c:1202\n Read of size 4 at addr ffff888144a738dc\n by task kworker/u17:1/83:\n __hci_cmd_sync_sk+0x12f2/0x1c30 net/bluetooth/hci_sync.c:200\n __hci_cmd_sync+0x55/0x80 net/bluetooth/hci_sync.c:223\n btintel_hw_error+0x186/0x670 drivers/bluetooth/btintel.c:260"
}
],
"lastModified": "2026-06-17T10:33:51.727",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "13A272C2-FFCB-4269-8944-00DFA555EB6F",
"versionEndExcluding": "6.6.131",
"versionStartIncluding": "4.3.1"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "97EB19EC-A11E-49C6-9D2F-6F6EC6CB98B6",
"versionEndExcluding": "6.12.80",
"versionStartIncluding": "6.7"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "ED39847A-3B46-4729-B7CA-B2C30B9FA8FE",
"versionEndExcluding": "6.18.21",
"versionStartIncluding": "6.13"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "4CA2E747-A9EC-4518-9AA2-B4247FC748B7",
"versionEndExcluding": "6.19.11",
"versionStartIncluding": "6.19"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:4.3:-:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "5419A247-F671-44D6-9848-35264FDCD816"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}