CVE-2026-46111 (GCVE-0-2026-46111)
Vulnerability from cvelistv5 – Published: 2026-05-28 09:35 – Updated: 2026-08-19 16:28
VLAI
EPSS
VEX
Title
Bluetooth: hci_conn: fix potential UAF in create_big_sync
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: hci_conn: fix potential UAF in create_big_sync
Add hci_conn_valid() check in create_big_sync() to detect stale
connections before proceeding with BIG creation. Handle the
resulting -ECANCELED in create_big_complete() and re-validate the
connection under hci_dev_lock() before dereferencing, matching the
pattern used by create_le_conn_complete() and create_pa_complete().
Keep the hci_conn object alive across the async boundary by taking
a reference via hci_conn_get() when queueing create_big_sync(), and
dropping it in the completion callback. The refcount and the lock
are complementary: the refcount keeps the object allocated, while
hci_dev_lock() serializes hci_conn_hash_del()'s list_del_rcu() on
hdev->conn_hash, as required by hci_conn_del().
hci_conn_put() is called outside hci_dev_unlock() so the final put
(which resolves to kfree() via bt_link_release) does not run under
hdev->lock, though the release path would be safe either way.
Without this, create_big_complete() would unconditionally
dereference the conn pointer on error, causing a use-after-free
via hci_connect_cfm() and hci_conn_del().
Severity
7.8 (High)
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
eca0ae4aea66914515e5e3098ea051b518ee5316 , < d41093723e47255d7d74df86e2736711c1b8486e
(git)
Affected: eca0ae4aea66914515e5e3098ea051b518ee5316 , < 6823f730bf195fc296d9edd09e2ca94bc1ff5584 (git) Affected: eca0ae4aea66914515e5e3098ea051b518ee5316 , < 1750a2df0eab61dc421a7afae74abdd239a44b85 (git) Affected: eca0ae4aea66914515e5e3098ea051b518ee5316 , < dc34f8d8240f25dd137dc2758ebbcc75e3779142 (git) Affected: eca0ae4aea66914515e5e3098ea051b518ee5316 , < f8eaf92c57ad99358dd372580d5ff87623343a72 (git) Affected: eca0ae4aea66914515e5e3098ea051b518ee5316 , < 0beddb0c380bed5f5b8e61ddbe14635bb73d0b41 (git) |
guessed | |
| Linux | Linux |
Affected:
6.0
Unaffected: 0 , < 6.0 (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.90 , ≤ 6.12.* (semver) Unaffected: 6.18.32 , ≤ 6.18.* (semver) Unaffected: 7.0.7 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: fix potential UAF in create_big_sync\n\nAdd hci_conn_valid() check in create_big_sync() to detect stale\nconnections before proceeding with BIG creation. Handle the\nresulting -ECANCELED in create_big_complete() and re-validate the\nconnection under hci_dev_lock() before dereferencing, matching the\npattern used by create_le_conn_complete() and create_pa_complete().\n\nKeep the hci_conn object alive across the async boundary by taking\na reference via hci_conn_get() when queueing create_big_sync(), and\ndropping it in the completion callback. The refcount and the lock\nare complementary: the refcount keeps the object allocated, while\nhci_dev_lock() serializes hci_conn_hash_del()\u0027s list_del_rcu() on\nhdev-\u003econn_hash, as required by hci_conn_del().\n\nhci_conn_put() is called outside hci_dev_unlock() so the final put\n(which resolves to kfree() via bt_link_release) does not run under\nhdev-\u003elock, though the release path would be safe either way.\n\nWithout this, create_big_complete() would unconditionally\ndereference the conn pointer on error, causing a use-after-free\nvia hci_connect_cfm() and hci_conn_del()."
}
],
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{
"cvssV3_1": {
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"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The UAF is reached only through a local ISO socket connect() syscall (BTPROTO_ISO \u2192 iso_connect_bis \u2192 hci_connect_bis); BIG broadcast setup is locally initiated and requires no Bluetooth peer or over-the-air frame, so the attacker needs local system access.\nAC:L - This is a use-after-free where the attacker controls both sides of the race \u2014 initiating the async create_big work via connect() and freeing the conn (e.g., closing the socket) \u2014 and can retry at will, so the condition is within attacker control.\nPR:L - Creating and connecting an ISO socket requires no capability check (iso_sock_create/bt_sock_create perform none), so any unprivileged local user can reach the path on systems where the ISO/BIS feature is enabled.\nUI:N - The attacker performs all steps (open socket, connect, race a teardown); no victim interaction is required.\nS:U - The use-after-free is contained within the kernel\u0027s own memory/security authority and does not cross into another security boundary such as a VM or IOMMU domain.\nC:H - A UAF of the hci_conn object gives the attacker control over the freed object\u0027s contents, enabling kernel-memory disclosure (e.g., leaking pointers/data placed in the reclaimed allocation).\nI:H - The freed hci_conn is dereferenced and written via hci_connect_cfm() and hci_conn_del() (including list_del_rcu on conn_hash), so heap grooming of the freed slab yields an arbitrary-write/control-flow primitive.\nA:H - Dereferencing and deleting a freed hci_conn reliably causes memory corruption leading to a kernel oops/panic."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:28:01.615Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
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},
{
"url": "https://git.kernel.org/stable/c/6823f730bf195fc296d9edd09e2ca94bc1ff5584"
},
{
"url": "https://git.kernel.org/stable/c/1750a2df0eab61dc421a7afae74abdd239a44b85"
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{
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},
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],
"title": "Bluetooth: hci_conn: fix potential UAF in create_big_sync",
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"cveId": "CVE-2026-46111",
"datePublished": "2026-05-28T09:35:19.970Z",
"dateReserved": "2026-05-13T15:03:33.098Z",
"dateUpdated": "2026-08-19T16:28:01.615Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
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"cve": "CVE-2026-46111",
"date": "2026-09-13",
"epss": "0.00126",
"percentile": "0.02569"
},
"microsoft_vex": {
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"cve": "CVE-2026-46111",
"id": "msrc_CVE-2026-46111",
"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_conn: fix potential UAF in create_big_sync",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46111.json",
"version": "3"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-46111\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-28T10:16:26.550\",\"lastModified\":\"2026-08-19T17:18:49.880\",\"vulnStatus\":\"Undergoing Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: hci_conn: fix potential UAF in create_big_sync\\n\\nAdd hci_conn_valid() check in create_big_sync() to detect stale\\nconnections before proceeding with BIG creation. Handle the\\nresulting -ECANCELED in create_big_complete() and re-validate the\\nconnection under hci_dev_lock() before dereferencing, matching the\\npattern used by create_le_conn_complete() and create_pa_complete().\\n\\nKeep the hci_conn object alive across the async boundary by taking\\na reference via hci_conn_get() when queueing create_big_sync(), and\\ndropping it in the completion callback. The refcount and the lock\\nare complementary: the refcount keeps the object allocated, while\\nhci_dev_lock() serializes hci_conn_hash_del()\u0027s list_del_rcu() on\\nhdev-\u003econn_hash, as required by hci_conn_del().\\n\\nhci_conn_put() is called outside hci_dev_unlock() so the final put\\n(which resolves to kfree() via bt_link_release) does not run under\\nhdev-\u003elock, though the release path would be safe either way.\\n\\nWithout this, create_big_complete() would unconditionally\\ndereference the conn pointer on error, causing a use-after-free\\nvia hci_connect_cfm() and 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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-05T14:46:18+00:00",
"cve": "CVE-2026-46111",
"id": "CVE-2026-46111",
"initial_release_date": "2026-05-28T00:00:00+00:00",
"product_status:known_affected": "198",
"product_status:known_not_affected": "76",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Bluetooth: hci_conn: fix potential UAF in create_big_sync",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46111.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-08-31T16:56:23Z",
"cve": "CVE-2026-46111",
"id": "CVE-2026-46111",
"initial_release_date": "2026-05-29T01:17:03Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "482",
"product_status:known_not_affected": "221",
"product_status:recommended": "283",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-46111",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46111.json",
"version": "18"
}
}
}
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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.
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.
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