CVE-2026-31408 (GCVE-0-2026-31408)
Vulnerability from cvelistv5 – Published: 2026-04-06 07:38 – Updated: 2026-10-19 18:35
VLAI
EPSS
VEX
Title
Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold
sco_recv_frame() reads conn->sk under sco_conn_lock() but immediately
releases the lock without holding a reference to the socket. A concurrent
close() can free the socket between the lock release and the subsequent
sk->sk_state access, resulting in a use-after-free.
Other functions in the same file (sco_sock_timeout(), sco_conn_del())
correctly use sco_sock_hold() to safely hold a reference under the lock.
Fix by using sco_sock_hold() to take a reference before releasing the
lock, and adding sock_put() on all exit paths.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:09 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 37e18bc8c9a70d77bd099e2273f328b3bc7f6d0d
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d57384e27d1ebf0047e3f00a6e1181b8be9857a2 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b0a7da0e3f7442545f071499beb36374714bb9de (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 45aaca995e4a7a05b272a58e7ab2fff4f611b8f1 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 108b81514d8f2535eb16651495cefb2250528db3 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e76e8f0581ef555eacc11dbb095e602fb30a5361 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 598dbba9919c5e36c54fe1709b557d64120cb94b (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.12
Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.131 , ≤ 6.6.* (semver) Unaffected: 6.12.80 , ≤ 6.12.* (semver) Unaffected: 6.18.21 , ≤ 6.18.* (semver) Unaffected: 6.19.11 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
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},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: SCO: Correcci\u00f3n de uso despu\u00e9s de liberaci\u00f3n en sco_recv_frame() debido a la falta de sock_hold\n\nsco_recv_frame() lee conn -\u003e sk bajo sco_conn_lock() pero libera inmediatamente el bloqueo sin mantener una referencia al socket. Una llamada concurrente a close() puede liberar el socket entre la liberaci\u00f3n del bloqueo y el acceso posterior a sk -\u003e sk_state, lo que resulta en un uso despu\u00e9s de liberaci\u00f3n.\n\nOtras funciones en el mismo archivo (sco_sock_timeout(), sco_conn_del()) usan correctamente sco_sock_hold() para mantener de forma segura una referencia bajo el bloqueo.\n\nSe corrige usando sco_sock_hold() para tomar una referencia antes de liberar el bloqueo, y a\u00f1adiendo sock_put() en todas las rutas de salida."
}
],
"id": "CVE-2026-31408",
"lastModified": "2026-10-19T19:17:52.243",
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],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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}
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}
},
"redhat_vex": {
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"current_release_date": "2026-10-29T12:48:43+00:00",
"cve": "CVE-2026-31408",
"id": "CVE-2026-31408",
"initial_release_date": "2026-04-06T00:00:00+00:00",
"product_status:fixed": "1980",
"product_status:known_affected": "64",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31408.json",
"version": "3"
},
"vulnrichment": {
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{
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{
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}
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}
],
"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
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"value": "AV:A - Incoming Bluetooth SCO/eSCO data reaches the vulnerable function through the HCI receive path, so the attacker must be within Bluetooth radio range. This is adjacent-network reachability, not IP network or physical-device access.\nAC:L - The bug is a use-after-free race between received SCO data and socket close/teardown, and an attacker can repeatedly drive SCO traffic while provoking endpoint teardown to hit the window. No rare configuration or uncontrollable memory layout condition is required beyond Bluetooth SCO support.\nPR:N - The Bluetooth peer sending SCO data needs no account or privileges on the target system, and the per-packet receive path has no capability or authentication check. Incoming acceptance depends on Bluetooth connection/listening state, not target-user privileges held by the attacker.\nUI:N - Exploitation does not require a victim user to open a file, mount anything, or perform an explicit action. Once the Bluetooth/SCO endpoint is active, packets and teardown can be driven by protocol activity.\nS:U - The vulnerability is in the kernel Bluetooth stack and impacts the same kernel security authority. It is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - This is a kernel use-after-free of a socket object, and subsequent code dereferences the freed sock and can pass it into receive-queue handling. Such heap UAFs can be leveraged for kernel memory disclosure, so confidentiality impact is high.\nI:H - The freed sock pointer can be used in `sock_queue_rcv_skb()`, which updates socket queues/state and can invoke socket callbacks after reuse. This is kernel memory corruption with plausible control-flow or arbitrary-write exploitation, so integrity impact is high.\nA:H - Even without full exploitation, dereferencing and operating on a freed kernel socket can cause an oops, panic, or memory corruption crash. Availability impact is therefore high."
}
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}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.