CVE-2026-53252 (GCVE-0-2026-53252)
Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-25 08:39
VLAI
EPSS
VEX
Title
Bluetooth: fix memory leak in error path of hci_alloc_dev()
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: fix memory leak in error path of hci_alloc_dev()
Early failures in Bluetooth HCI UART configuration leak SRCU percpu
memory.
When device initialization fails before hci_register_dev() completes,
the HCI_UNREGISTER flag is never set. As a result, when the device
reference count reaches zero, bt_host_release() evaluates this flag as
false and falls back to a direct kfree(hdev).
Because hci_release_dev() is bypassed, the SRCU struct initialized
early in hci_alloc_dev() is never cleaned up, resulting in a leak of
percpu memory.
Fix the leak by explicitly calling cleanup_srcu_struct() in the
fallback (unregistered) branch of bt_host_release() before freeing
the device.
Severity
5.5 (Medium)
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
90dee0a0ff84fac8accd5be98412b3819f667149 , < 5b7dfca6f852e6b9d809fd0263b5427cc9fb33fd
(git)
Affected: c56b177efce8b62798e4d96bdb9867106cb7c4a0 , < c016118b9e51eeaf5bc93850d4c455a3b583c0aa (git) Affected: bc0819a25e04cd68ef3568cfa51b63118fea39a7 , < 0622e527a31d4b44737fed5c1a2ac1fc2cfb5184 (git) Affected: ce23b73f0f27e2dbeb81734a79db710f05aa33c6 , < bc2efe73c194a74839d7cf57b63880d97e21d309 (git) Affected: 1d6123102e9fbedc8d25bf4731da6d513173e49e , < ce4b4cac3c5749b6aa75e62e2991ae2263f2f889 (git) Affected: 1d6123102e9fbedc8d25bf4731da6d513173e49e , < f82799407a50af7bcacacf09cc9b279af8fe9b81 (git) Affected: 1d6123102e9fbedc8d25bf4731da6d513173e49e , < 37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37f (git) Affected: dd4becd3fd4102696e1c15e6d260a1712a2d8685 (git) Affected: 0e5c144c557df910ab64d9c25d06399a9a735e65 (git) Affected: 5.15.209 , < 5.15.210 (semver) Affected: 6.1.167 , < 6.1.176 (semver) Affected: 6.6.97 , < 6.6.143 (semver) Affected: 6.12.36 , < 6.12.94 (semver) Affected: 5.10.259 , < 5.11 (semver) Affected: 6.15.5 , < 6.16 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.16
Unaffected: 0 , < 6.16 (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: fix memory leak in error path of hci_alloc_dev()\n\nEarly failures in Bluetooth HCI UART configuration leak SRCU percpu\nmemory.\n\nWhen device initialization fails before hci_register_dev() completes,\nthe HCI_UNREGISTER flag is never set. As a result, when the device\nreference count reaches zero, bt_host_release() evaluates this flag as\nfalse and falls back to a direct kfree(hdev).\n\nBecause hci_release_dev() is bypassed, the SRCU struct initialized\nearly in hci_alloc_dev() is never cleaned up, resulting in a leak of\npercpu memory.\n\nFix the leak by explicitly calling cleanup_srcu_struct() in the\nfallback (unregistered) branch of bt_host_release() before freeing\nthe device."
}
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{
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"title": "Bluetooth: fix memory leak in error path of hci_alloc_dev()",
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"dateReserved": "2026-06-09T07:44:35.394Z",
"dateUpdated": "2026-06-25T08:39:43.951Z",
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"source": "Microsoft CSAF VEX",
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"title": "Bluetooth: fix memory leak in error path of hci_alloc_dev()",
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As a result, when the device\\nreference count reaches zero, bt_host_release() evaluates this flag as\\nfalse and falls back to a direct kfree(hdev).\\n\\nBecause hci_release_dev() is bypassed, the SRCU struct initialized\\nearly in hci_alloc_dev() is never cleaned up, resulting in a leak of\\npercpu memory.\\n\\nFix the leak by explicitly calling cleanup_srcu_struct() in the\\nfallback (unregistered) branch of bt_host_release() before freeing\\nthe device.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/hci_sysfs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"90dee0a0ff84fac8accd5be98412b3819f667149\",\"lessThan\":\"5b7dfca6f852e6b9d809fd0263b5427cc9fb33fd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c56b177efce8b62798e4d96bdb9867106cb7c4a0\",\"lessThan\":\"c016118b9e51eeaf5bc93850d4c455a3b583c0aa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bc0819a25e04cd68ef3568cfa51b63118fea39a7\",\"lessThan\":\"0622e527a31d4b44737fed5c1a2ac1fc2cfb5184\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ce23b73f0f27e2dbeb81734a79db710f05aa33c6\",\"lessThan\":\"bc2efe73c194a74839d7cf57b63880d97e21d309\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1d6123102e9fbedc8d25bf4731da6d513173e49e\",\"lessThan\":\"ce4b4cac3c5749b6aa75e62e2991ae2263f2f889\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1d6123102e9fbedc8d25bf4731da6d513173e49e\",\"lessThan\":\"f82799407a50af7bcacacf09cc9b279af8fe9b81\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1d6123102e9fbedc8d25bf4731da6d513173e49e\",\"lessThan\":\"37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dd4becd3fd4102696e1c15e6d260a1712a2d8685\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0e5c144c557df910ab64d9c25d06399a9a735e65\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.15.209\",\"lessThan\":\"5.15.210\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.167\",\"lessThan\":\"6.1.176\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.97\",\"lessThan\":\"6.6.143\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.36\",\"lessThan\":\"6.12.94\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.10.259\",\"lessThan\":\"5.11\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.15.5\",\"lessThan\":\"6.16\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/hci_sysfs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.94\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-401\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.259\",\"versionEndExcluding\":\"5.11\",\"matchCriteriaId\":\"52F60680-8824-4BB5-AF9B-B593D23018AE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.1.167\",\"versionEndExcluding\":\"6.1.176\",\"matchCriteriaId\":\"EA4D47D7-0677-4EA5-A70C-E66CDE321414\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.6.97\",\"versionEndExcluding\":\"6.6.143\",\"matchCriteriaId\":\"8C5F210A-4D29-4A1A-A880-4FECCDC57247\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.12.36\",\"versionEndExcluding\":\"6.12.94\",\"matchCriteriaId\":\"34DC91E5-0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"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-07-08T16:55:12+00:00",
"cve": "CVE-2026-53252",
"id": "CVE-2026-53252",
"initial_release_date": "2026-06-25T00:00:00+00:00",
"product_status:known_affected": "198",
"product_status:known_not_affected": "76",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Bluetooth: fix memory leak in error path of hci_alloc_dev()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53252.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-10T16:56:17Z",
"cve": "CVE-2026-53252",
"id": "CVE-2026-53252",
"initial_release_date": "2026-06-26T02:08:35Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "459",
"product_status:known_not_affected": "219",
"product_status:recommended": "273",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-53252",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53252.json",
"version": "13"
}
}
}
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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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