CVE-2026-46056 (GCVE-0-2026-46056)
Vulnerability from cvelistv5 – Published: 2026-05-27 12:57 – Updated: 2026-08-05 12:29
VLAI
EPSS
VEX
Title
Bluetooth: hci_event: fix potential UAF in SSP passkey handlers
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: hci_event: fix potential UAF in SSP passkey handlers
hci_conn lookup and field access must be covered by hdev lock in
hci_user_passkey_notify_evt() and hci_keypress_notify_evt(), otherwise
the connection can be freed concurrently.
Extend the hci_dev_lock critical section to cover all conn usage in both
handlers.
Keep the existing keypress notification behavior unchanged by routing
the early exits through a common unlock path.
Severity
8.8 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
92a25256f142d55e25f9959441cea6ddeabae57e , < ea18732d2614557e59f4c0d8cdbe6611aeab33b7
(git)
Affected: 92a25256f142d55e25f9959441cea6ddeabae57e , < d28311539ac9f65e29308ea219ecaa48aa5e76e5 (git) Affected: 92a25256f142d55e25f9959441cea6ddeabae57e , < b6ae482f88654db407c8c17619d4b62959b903ef (git) Affected: 92a25256f142d55e25f9959441cea6ddeabae57e , < 204028af77a265e31ceb4ba7f643349a3cca72b2 (git) Affected: 92a25256f142d55e25f9959441cea6ddeabae57e , < 01a6431766c35dfedb86e0cb5d3fc80c6d604a47 (git) Affected: 92a25256f142d55e25f9959441cea6ddeabae57e , < e08d75753db17aa943d7622f09d9c217b5bfd3b8 (git) Affected: 92a25256f142d55e25f9959441cea6ddeabae57e , < 8c6443bb9257b780986fb67ec08565bf48ecb8d7 (git) Affected: 92a25256f142d55e25f9959441cea6ddeabae57e , < 85fa3512048793076eef658f66489112dcc91993 (git) |
guessed | |
| Linux | Linux |
Affected:
3.7
Unaffected: 0 , < 3.7 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.86 , ≤ 6.12.* (semver) Unaffected: 6.18.27 , ≤ 6.18.* (semver) Unaffected: 7.0.4 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
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"net/bluetooth/hci_event.c"
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{
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},
{
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},
{
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"version": "6.6.140",
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},
{
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"versionType": "semver"
},
{
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"version": "6.18.27",
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},
{
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"version": "7.0.4",
"versionType": "semver"
},
{
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}
]
}
],
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_event: fix potential UAF in SSP passkey handlers\n\nhci_conn lookup and field access must be covered by hdev lock in\nhci_user_passkey_notify_evt() and hci_keypress_notify_evt(), otherwise\nthe connection can be freed concurrently.\n\nExtend the hci_dev_lock critical section to cover all conn usage in both\nhandlers.\n\nKeep the existing keypress notification behavior unchanged by routing\nthe early exits through a common unlock path."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:A - The vulnerable handlers process HCI Secure Simple Pairing events (User Passkey Notify / Keypress Notify) driven by a remote Bluetooth peer during SSP pairing, so the attacker must be within Bluetooth radio range (adjacent), matching kernel guidance that Bluetooth = Adjacent.\nAC:L - This is a use-after-free where a remote peer drives the passkey/keypress events while connection teardown frees the conn from a concurrent context; the attacker influences both sides of the race and can retry, and UAF bugs are scored AC:L unless the race is uncontrollable.\nPR:N - The code path is reached by a remote Bluetooth device participating in the SSP pairing handshake, requiring no credentials or privileges on the target system.\nUI:N - The handlers execute automatically when the controller forwards the SSP passkey/keypress HCI events during the pairing protocol exchange; no local user action is required to reach the vulnerable code.\nS:U - The corruption is confined to kernel memory within the same security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The use-after-free reads fields (dst, type, dst_type, passkey) from a freed and potentially reallocated hci_conn object, which can disclose attacker-controlled or sensitive kernel heap contents.\nI:H - The handlers write to the freed object (passkey_notify and passkey_entered fields), giving a UAF write into reallocated heap memory that can be leveraged for heap grooming and control-flow corruption.\nA:H - A use-after-free on the hci_conn structure readily causes kernel oops/panic, yielding high availability impact."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:29:24.462Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/ea18732d2614557e59f4c0d8cdbe6611aeab33b7"
},
{
"url": "https://git.kernel.org/stable/c/d28311539ac9f65e29308ea219ecaa48aa5e76e5"
},
{
"url": "https://git.kernel.org/stable/c/b6ae482f88654db407c8c17619d4b62959b903ef"
},
{
"url": "https://git.kernel.org/stable/c/204028af77a265e31ceb4ba7f643349a3cca72b2"
},
{
"url": "https://git.kernel.org/stable/c/01a6431766c35dfedb86e0cb5d3fc80c6d604a47"
},
{
"url": "https://git.kernel.org/stable/c/e08d75753db17aa943d7622f09d9c217b5bfd3b8"
},
{
"url": "https://git.kernel.org/stable/c/8c6443bb9257b780986fb67ec08565bf48ecb8d7"
},
{
"url": "https://git.kernel.org/stable/c/85fa3512048793076eef658f66489112dcc91993"
}
],
"title": "Bluetooth: hci_event: fix potential UAF in SSP passkey handlers",
"x_generator": {
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}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-46056",
"datePublished": "2026-05-27T12:57:15.150Z",
"dateReserved": "2026-05-13T15:03:33.094Z",
"dateUpdated": "2026-08-05T12:29:24.462Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-46056",
"date": "2026-09-16",
"epss": "0.00262",
"percentile": "0.18206"
},
"microsoft_vex": {
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"cve": "CVE-2026-46056",
"id": "msrc_CVE-2026-46056",
"initial_release_date": "2026-05-02T00:00:00.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "Bluetooth: hci_event: fix potential UAF in SSP passkey handlers",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46056.json",
"version": "4"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-46056\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-27T14:17:25.317\",\"lastModified\":\"2026-06-19T13:16:32.587\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: hci_event: fix potential UAF in SSP passkey handlers\\n\\nhci_conn lookup and field access must be covered by hdev lock in\\nhci_user_passkey_notify_evt() and hci_keypress_notify_evt(), otherwise\\nthe connection can be freed concurrently.\\n\\nExtend the hci_dev_lock critical section to cover all conn usage in both\\nhandlers.\\n\\nKeep the existing keypress notification behavior unchanged by routing\\nthe early exits through a common unlock path.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/hci_event.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"92a25256f142d55e25f9959441cea6ddeabae57e\",\"lessThan\":\"ea18732d2614557e59f4c0d8cdbe6611aeab33b7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"92a25256f142d55e25f9959441cea6ddeabae57e\",\"lessThan\":\"d28311539ac9f65e29308ea219ecaa48aa5e76e5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"92a25256f142d55e25f9959441cea6ddeabae57e\",\"lessThan\":\"b6ae482f88654db407c8c17619d4b62959b903ef\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"92a25256f142d55e25f9959441cea6ddeabae57e\",\"lessThan\":\"204028af77a265e31ceb4ba7f643349a3cca72b2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"92a25256f142d55e25f9959441cea6ddeabae57e\",\"lessThan\":\"01a6431766c35dfedb86e0cb5d3fc80c6d604a47\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"92a25256f142d55e25f9959441cea6ddeabae57e\",\"lessThan\":\"e08d75753db17aa943d7622f09d9c217b5bfd3b8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"92a25256f142d55e25f9959441cea6ddeabae57e\",\"lessThan\":\"8c6443bb9257b780986fb67ec08565bf48ecb8d7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"92a25256f142d55e25f9959441cea6ddeabae57e\",\"lessThan\":\"85fa3512048793076eef658f66489112dcc91993\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/hci_event.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.140\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.86\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.27\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.4\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.7\",\"versionEndExcluding\":\"6.1.175\",\"matchCriteriaId\":\"EBFC6347-9890-499C-AFAB-ED243C4C3818\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.140\",\"matchCriteriaId\":\"A1A92866-F406-43B5-B2D1-CFC274753E9D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.86\",\"matchCriteriaId\":\"55DA1C62-9991-451E-B8A8-E0004E00F789\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.27\",\"matchCriteriaId\":\"A10AC84F-C058-47D5-85B4-E6E51A613B74\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"7.0.4\",\"matchCriteriaId\":\"CDB78D6D-22C3-4154-B0D0-94AF1CE5C2E3\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/01a6431766c35dfedb86e0cb5d3fc80c6d604a47\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/204028af77a265e31ceb4ba7f643349a3cca72b2\",\"source\":\"41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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-09-16T05:42:55+00:00",
"cve": "CVE-2026-46056",
"id": "CVE-2026-46056",
"initial_release_date": "2026-05-27T00:00:00+00:00",
"product_status:fixed": "1930",
"product_status:known_affected": "64",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Bluetooth: hci_event: fix potential UAF in SSP passkey handlers",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46056.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-16T00:13:00Z",
"cve": "CVE-2026-46056",
"id": "CVE-2026-46056",
"initial_release_date": "2026-05-28T03:53:33Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "519",
"product_status:known_not_affected": "21",
"product_status:recommended": "572",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-46056",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46056.json",
"version": "19"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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