EUVD-2026-39202
GHSA-q6x9-g333-77r4
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Local socket access with low privileges triggers the leak; no confidentiality or integrity impact, only availability via resource exhaustion.
Primary rating from NVD.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
5DescriptionNVD
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: ISO: Fix not releasing hdev reference on iso_conn_big_sync
hci_get_route() returns a reference-counted hci_dev pointer via hci_dev_hold(). The function exits normally or with an error without ever releasing it.
AnalysisAI
Reference leak in the Linux kernel Bluetooth ISO subsystem allows a local low-privileged user to exhaust kernel resources and cause a denial of service. The iso_conn_big_sync function acquires an hci_dev reference via hci_dev_hold() through hci_get_route() but never releases it, violating the borrow contract. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires local authenticated access with at minimum CAP_NET_RAW or the ability to create Bluetooth sockets (PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 5.5 (Medium) with vector AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H is internally consistent: local access with low privileges is sufficient, no user interaction is needed, and the sole impact is high availability (DoS). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A local unprivileged user on a Linux system with a Bluetooth adapter writes a small program that repeatedly opens an ISO Bluetooth socket and invokes the BIG synchronization operation, intentionally never cleaning up, to trigger the reference leak in `iso_conn_big_sync`. Each call leaks one `hci_dev` reference; after thousands of iterations the `hci_dev` slab allocation grows without bound, eventually exhausting kernel memory and causing the system to hang or panic. … |
| Remediation | Update to a patched stable kernel release: Linux 6.12.94, 7.0.13, 7.1 (final), or 6.18.36 as appropriate for the deployed series. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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