CVE-2025-40318 (GCVE-0-2025-40318)
Vulnerability from cvelistv5 – Published: 2025-12-08 00:46 – Updated: 2026-08-05 12:09
VLAI
EPSS
VEX
Title
Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once
hci_cmd_sync_dequeue_once() does lookup and then cancel
the entry under two separate lock sections. Meanwhile,
hci_cmd_sync_work() can also delete the same entry,
leading to double list_del() and "UAF".
Fix this by holding cmd_sync_work_lock across both
lookup and cancel, so that the entry cannot be removed
concurrently.
Severity
8.8 (High)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
f00f36db76eb8fd10d13e80e2590f23b5beaa54d , < 0a94f7e017438935c09ef833a1aa908ad9875213
(git)
Affected: 1499f79995c7ee58e3bfeeff75f6d1b37dcda881 , < 932c0a4f77ac13e526fdd5b42914d29c9821d389 (git) Affected: 505ea2b295929e7be2b4e1bc86ee31cb7862fb01 , < ae76cf6c2c842944c6514c57df54d728f1916553 (git) Affected: 505ea2b295929e7be2b4e1bc86ee31cb7862fb01 , < 9cd536970192b72257afcdfba0bfc09993e6f19c (git) Affected: 505ea2b295929e7be2b4e1bc86ee31cb7862fb01 , < 09b0cd1297b4dbfe736aeaa0ceeab2265f47f772 (git) Affected: 357603f4d396d85fbf0045512efaf1d7f7394ed7 (git) Affected: 6.1.120 , < 6.1.159 (semver) Affected: 6.6.51 , < 6.6.117 (semver) Affected: 6.8.9 , < 6.9 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.9
Unaffected: 0 , < 6.9 (semver) Unaffected: 6.1.159 , ≤ 6.1.* (semver) Unaffected: 6.6.117 , ≤ 6.6.* (semver) Unaffected: 6.12.58 , ≤ 6.12.* (semver) Unaffected: 6.17.8 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/bluetooth/hci_sync.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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"versionType": "git"
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"versionType": "git"
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{
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"status": "affected",
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"versionType": "git"
},
{
"status": "affected",
"version": "357603f4d396d85fbf0045512efaf1d7f7394ed7",
"versionType": "git"
},
{
"lessThan": "6.1.159",
"status": "affected",
"version": "6.1.120",
"versionType": "semver"
},
{
"lessThan": "6.6.117",
"status": "affected",
"version": "6.6.51",
"versionType": "semver"
},
{
"lessThan": "6.9",
"status": "affected",
"version": "6.8.9",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/bluetooth/hci_sync.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.9"
},
{
"lessThan": "6.9",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.159",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.117",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.58",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.159",
"versionStartIncluding": "6.1.120",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.117",
"versionStartIncluding": "6.6.51",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.58",
"versionStartIncluding": "6.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.17.8",
"versionStartIncluding": "6.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18",
"versionStartIncluding": "6.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.8.9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once\n\nhci_cmd_sync_dequeue_once() does lookup and then cancel\nthe entry under two separate lock sections. Meanwhile,\nhci_cmd_sync_work() can also delete the same entry,\nleading to double list_del() and \"UAF\".\n\nFix this by holding cmd_sync_work_lock across both\nlookup and cancel, so that the entry cannot be removed\nconcurrently."
}
],
"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 flaw is in the Bluetooth HCI command-sync queue, and the create-connection entries it manages are queued and aborted in response to LE/ACL link events from a peer in radio range (advertising reports driving `check_pending_le_conn()`, and `le_conn_timeout` when the peer stops responding). An attacker within Bluetooth range can drive both the queue and cancel sides without any local access.\nAC:L - The attacker controls both sides of the race \u2014 repeatedly forcing connection attempts and aborts cycles `hci_cancel_connect_sync()` against the `cmd_sync_work` kthread draining the same list entry, and the attempt can be retried without limit. The window sits between two lock acquisitions in the same function with the worker on a separate CPU, making it readily hit on SMP.\nPR:N - The adjacent attacker holds no credentials on the target: the LE create-connection queue/cancel cycle happens entirely before pairing or authentication completes. Even on the purely local path only an unprivileged AF_BLUETOOTH socket is needed, since `l2cap_sock_create()` gates only SOCK_RAW behind CAP_NET_RAW.\nUI:N - Background LE auto-connect and connection-timeout handling proceed autonomously in kernel workqueues with no victim action. No file must be opened, device mounted, or prompt accepted.\nS:U - The corruption is confined to kernel heap objects managed by the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed. Impact is standard in-kernel compromise.\nC:H - The use-after-free reads `entry-\u003edestroy` and `entry-\u003edata` out of a freed kmalloc-64 object and dereferences them, and the resulting hijacked call plus double-`list_del` write primitive can be leveraged into arbitrary kernel memory disclosure. Freed-slab reads alone already expose adjacent kernel heap contents.\nI:H - `_hci_cmd_sync_cancel_entry()` calls a function pointer read from freed memory and then performs a double `list_del()` that writes attacker-groomable pointers to attacker-groomable addresses, plus a double `kfree()`. That combination is a direct control-flow-hijack and arbitrary-write path to full kernel code execution.\nA:H - Without successful grooming the same code path dereferences LIST_POISON or freed slab contents, producing a `list_del corruption` BUG, GPF, or panic. The double free additionally corrupts the slab allocator, crashing the system."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:09:29.032Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/0a94f7e017438935c09ef833a1aa908ad9875213"
},
{
"url": "https://git.kernel.org/stable/c/932c0a4f77ac13e526fdd5b42914d29c9821d389"
},
{
"url": "https://git.kernel.org/stable/c/ae76cf6c2c842944c6514c57df54d728f1916553"
},
{
"url": "https://git.kernel.org/stable/c/9cd536970192b72257afcdfba0bfc09993e6f19c"
},
{
"url": "https://git.kernel.org/stable/c/09b0cd1297b4dbfe736aeaa0ceeab2265f47f772"
}
],
"title": "Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-40318",
"datePublished": "2025-12-08T00:46:45.382Z",
"dateReserved": "2025-04-16T07:20:57.186Z",
"dateUpdated": "2026-08-05T12:09:29.032Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2025-40318",
"date": "2026-09-19",
"epss": "0.0027",
"percentile": "0.19494"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/bluetooth/hci_sync.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "0a94f7e017438935c09ef833a1aa908ad9875213",
"status": "affected",
"version": "f00f36db76eb8fd10d13e80e2590f23b5beaa54d",
"versionType": "git"
},
{
"lessThan": "932c0a4f77ac13e526fdd5b42914d29c9821d389",
"status": "affected",
"version": "1499f79995c7ee58e3bfeeff75f6d1b37dcda881",
"versionType": "git"
},
{
"lessThan": "ae76cf6c2c842944c6514c57df54d728f1916553",
"status": "affected",
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"versionType": "git"
},
{
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},
{
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"versionType": "git"
},
{
"status": "affected",
"version": "357603f4d396d85fbf0045512efaf1d7f7394ed7",
"versionType": "git"
},
{
"lessThan": "6.1.159",
"status": "affected",
"version": "6.1.120",
"versionType": "semver"
},
{
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"status": "affected",
"version": "6.6.51",
"versionType": "semver"
},
{
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"status": "affected",
"version": "6.8.9",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/bluetooth/hci_sync.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.9"
},
{
"lessThan": "6.9",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.159",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.117",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.58",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once\n\nhci_cmd_sync_dequeue_once() does lookup and then cancel\nthe entry under two separate lock sections. Meanwhile,\nhci_cmd_sync_work() can also delete the same entry,\nleading to double list_del() and \"UAF\".\n\nFix this by holding cmd_sync_work_lock across both\nlookup and cancel, so that the entry cannot be removed\nconcurrently."
}
],
"id": "CVE-2025-40318",
"lastModified": "2026-07-30T06:24:28.550",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2025-12-08T01:16:04.413",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/09b0cd1297b4dbfe736aeaa0ceeab2265f47f772"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/0a94f7e017438935c09ef833a1aa908ad9875213"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/932c0a4f77ac13e526fdd5b42914d29c9821d389"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/9cd536970192b72257afcdfba0bfc09993e6f19c"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/ae76cf6c2c842944c6514c57df54d728f1916553"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Deferred"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-07-30T08:37:33+00:00",
"cve": "CVE-2025-40318",
"id": "CVE-2025-40318",
"initial_release_date": "2025-12-08T00:00:00+00:00",
"product_status:fixed": "1224",
"product_status:known_affected": "22",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40318.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-11T01:53:51Z",
"cve": "CVE-2025-40318",
"id": "CVE-2025-40318",
"initial_release_date": "2025-12-09T00:24:12Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "394",
"product_status:known_not_affected": "429",
"product_status:recommended": "467",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-40318",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-40318.json",
"version": "33"
}
}
}
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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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