CVE-2026-31499 (GCVE-0-2026-31499)
Vulnerability from cvelistv5 – Published: 2026-04-22 13:54 – Updated: 2026-04-22 13:54
VLAI?
Title
Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del()
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del()
l2cap_conn_del() calls cancel_delayed_work_sync() for both info_timer
and id_addr_timer while holding conn->lock. However, the work functions
l2cap_info_timeout() and l2cap_conn_update_id_addr() both acquire
conn->lock, creating a potential AB-BA deadlock if the work is already
executing when l2cap_conn_del() takes the lock.
Move the work cancellations before acquiring conn->lock and use
disable_delayed_work_sync() to additionally prevent the works from
being rearmed after cancellation, consistent with the pattern used in
hci_conn_del().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Affected:
ab4eedb790cae44313759b50fe47da285e2519d5 , < 3f26ecbd9cde621dd94be7ef252c7210b965a5c7
(git)
Affected: ab4eedb790cae44313759b50fe47da285e2519d5 , < d008460de352e534f6721de829b093368564ec66 (git) Affected: ab4eedb790cae44313759b50fe47da285e2519d5 , < 00fdebbbc557a2fc21321ff2eaa22fd70c078608 (git) Affected: efc30877bd4bc85fefe98d80af60fafc86e5775e (git) Affected: f87271d21dd4ee83857ca11b94e7b4952749bbae (git) Affected: 18ab6b6078fa8191ca30a3065d57bf35d5635761 (git) |
||
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"net/bluetooth/l2cap_core.c"
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"versionType": "semver"
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}
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"providerMetadata": {
"dateUpdated": "2026-04-22T13:54:20.384Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"url": "https://git.kernel.org/stable/c/d008460de352e534f6721de829b093368564ec66"
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{
"url": "https://git.kernel.org/stable/c/00fdebbbc557a2fc21321ff2eaa22fd70c078608"
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],
"title": "Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del()",
"x_generator": {
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"cveId": "CVE-2026-31499",
"datePublished": "2026-04-22T13:54:20.384Z",
"dateReserved": "2026-03-09T15:48:24.104Z",
"dateUpdated": "2026-04-22T13:54:20.384Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
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"nvd": "{\"cve\":{\"id\":\"CVE-2026-31499\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-22T14:16:48.283\",\"lastModified\":\"2026-04-22T14:16:48.283\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: L2CAP: Fix deadlock in l2cap_conn_del()\\n\\nl2cap_conn_del() calls cancel_delayed_work_sync() for both info_timer\\nand id_addr_timer while holding conn-\u003elock. However, the work functions\\nl2cap_info_timeout() and l2cap_conn_update_id_addr() both acquire\\nconn-\u003elock, creating a potential AB-BA deadlock if the work is already\\nexecuting when l2cap_conn_del() takes the lock.\\n\\nMove the work cancellations before acquiring conn-\u003elock and use\\ndisable_delayed_work_sync() to additionally prevent the works from\\nbeing rearmed after cancellation, consistent with the pattern used in\\nhci_conn_del().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/00fdebbbc557a2fc21321ff2eaa22fd70c078608\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3f26ecbd9cde621dd94be7ef252c7210b965a5c7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d008460de352e534f6721de829b093368564ec66\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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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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