Bluetooth: hci_core: Fix UAF in hci_unregister_dev() (CVE-2026-74302) | HOL Guard CVE

High · CVSS 7.8CVE-2026-74302

Bluetooth: hci_core: Fix UAF in hci_unregister_dev()

Answer in brief

CVE-2026-74302 records a High severity (CVSS 7.8) vulnerability in Bluetooth: hci_core: Fix UAF in hci_unregister_dev(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 15, 2026Updated Aug 17, 2026Source checked Sep 29, 2026First seen by HOL Aug 15, 2026Material review Aug 17, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=0d151a103775dd9645c78c97f77d6e2a5298d913 <48c7ad6afcc58c2cda11fed39791708103b6a644 \|\| >=0d151a103775dd9645c78c97f77d6e2a5298d913 <a0fd1086a57b982f8c24ae4ab165c2af39fe1735 \|\| >=0d151a103775dd9645c78c97f77d6e2a5298d913 <672d52d9412252e61b8de8d773ccdf5a277cf540 \|\| >=0d151a103775dd9645c78c97f77d6e2a5298d913 <5edcc018fa6e80b2c478454a4a8229c23d67c181 \|\| 48542881997e17b49dc16b93fe910e0cfcf7a9f9 \|\| 9cfc84b1d464cc024286f42a090718f9067b80ed \|\| ddeda6ca5f218b668b560d90fc31ae469adbfd92 \|\| d2ce562a5aff1dcd0c50d9808ea825ef90da909f \|\| 96600c2e5ee8213dbab5df1617293d8e847bb4fa \|\| d6cbce18370641a21dd889e8613d8153df15eb39 \|\| 3f939bd73fed12dddc2a32a76116c19ca47c7678 \|\| >=4.19.319 <4.20 \|\| >=5.4.281 <5.5 \|\| >=5.10.223 <5.11 \|\| >=5.15.164 <5.16 \|\| >=6.1.101 <6.2 \|\| >=6.6.42 <6.7 \|\| >=6.9.11 <6.10	48c7ad6afcc58c2cda11fed39791708103b6a644, a0fd1086a57b982f8c24ae4ab165c2af39fe1735, 672d52d9412252e61b8de8d773ccdf5a277cf540, 5edcc018fa6e80b2c478454a4a8229c23d67c181, 4.20, 5.5, 5.11, 5.16, 6.2, 6.7, 6.10
Linux/Linuxgeneric	6.10	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 48c7ad6afcc58c2cda11fed39791708103b6a644 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 15, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_core: Fix UAF in hci_unregister_dev() hci_unregister_dev() does not disable cmd_timer and ncmd_timer before the hci_dev structure is freed. If a timeout fires during device teardown, the callback dereferences freed memory (including the hdev->reset function pointer), leading to a use-after-free. Add disable_delayed_work_sync() calls alongside the existing disable_work_sync() calls to ensure both timers are fully quiesced before teardown proceeds.

Quoted source text, attributed separately from HOL analysis.