CVE-2026-53252 (GCVE-0-2026-53252)
Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-25 08:39
VLAI?
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 ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| 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) |
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{
"containers": {
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{
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"product": "Linux",
"programFiles": [
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},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
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},
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"status": "unaffected",
"version": "0",
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},
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},
{
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},
{
"lessThanOrEqual": "6.6.*",
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},
{
"lessThanOrEqual": "6.12.*",
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},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.36",
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},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.13",
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},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
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]
}
],
"descriptions": [
{
"lang": "en",
"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."
}
],
"providerMetadata": {
"dateUpdated": "2026-06-25T08:39:43.951Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/5b7dfca6f852e6b9d809fd0263b5427cc9fb33fd"
},
{
"url": "https://git.kernel.org/stable/c/c016118b9e51eeaf5bc93850d4c455a3b583c0aa"
},
{
"url": "https://git.kernel.org/stable/c/0622e527a31d4b44737fed5c1a2ac1fc2cfb5184"
},
{
"url": "https://git.kernel.org/stable/c/bc2efe73c194a74839d7cf57b63880d97e21d309"
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{
"url": "https://git.kernel.org/stable/c/ce4b4cac3c5749b6aa75e62e2991ae2263f2f889"
},
{
"url": "https://git.kernel.org/stable/c/f82799407a50af7bcacacf09cc9b279af8fe9b81"
},
{
"url": "https://git.kernel.org/stable/c/37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37f"
}
],
"title": "Bluetooth: fix memory leak in error path of hci_alloc_dev()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-53252",
"datePublished": "2026-06-25T08:39:43.951Z",
"dateReserved": "2026-06-09T07:44:35.394Z",
"dateUpdated": "2026-06-25T08:39:43.951Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
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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