Bluetooth: hci_core: Fix UAF in hci_unregister_dev()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74302
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:29 UTC
Updated2026-10-21 13:19:41 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001700000 probability, percentile 0.059490000 (date 2026-10-16)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d6cbce18370641a21dd889e8613d8153df15eb39 bce2eec05bce548b548aca52c1834540f97d5d60 git Not specified
CNA Linux Linux affected 0d151a103775dd9645c78c97f77d6e2a5298d913 48c7ad6afcc58c2cda11fed39791708103b6a644 git Not specified
CNA Linux Linux affected 0d151a103775dd9645c78c97f77d6e2a5298d913 a0fd1086a57b982f8c24ae4ab165c2af39fe1735 git Not specified
CNA Linux Linux affected 0d151a103775dd9645c78c97f77d6e2a5298d913 672d52d9412252e61b8de8d773ccdf5a277cf540 git Not specified
CNA Linux Linux affected 0d151a103775dd9645c78c97f77d6e2a5298d913 5edcc018fa6e80b2c478454a4a8229c23d67c181 git Not specified
CNA Linux Linux affected 48542881997e17b49dc16b93fe910e0cfcf7a9f9 git Not specified
CNA Linux Linux affected 9cfc84b1d464cc024286f42a090718f9067b80ed git Not specified
CNA Linux Linux affected ddeda6ca5f218b668b560d90fc31ae469adbfd92 git Not specified
CNA Linux Linux affected d2ce562a5aff1dcd0c50d9808ea825ef90da909f git Not specified
CNA Linux Linux affected 96600c2e5ee8213dbab5df1617293d8e847bb4fa git Not specified
CNA Linux Linux affected 3f939bd73fed12dddc2a32a76116c19ca47c7678 git Not specified
CNA Linux Linux affected 6.6.42 6.6.160 semver Not specified
CNA Linux Linux affected 4.19.319 4.20 semver Not specified
CNA Linux Linux affected 5.4.281 5.5 semver Not specified
CNA Linux Linux affected 5.10.223 5.11 semver Not specified
CNA Linux Linux affected 5.15.164 5.16 semver Not specified
CNA Linux Linux affected 6.1.101 6.2 semver Not specified
CNA Linux Linux affected 6.9.11 6.10 semver Not specified
CNA Linux Linux affected 6.10 Not specified
CNA Linux Linux unaffected 6.10 semver Not specified
CNA Linux Linux unaffected 6.6.160 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a0fd1086a57b982f8c24ae4ab165c2af39fe1735 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/48c7ad6afcc58c2cda11fed39791708103b6a644 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/672d52d9412252e61b8de8d773ccdf5a277cf540 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bce2eec05bce548b548aca52c1834540f97d5d60 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5edcc018fa6e80b2c478454a4a8229c23d67c181 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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