Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync

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Summary

CVECVE-2026-43019
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:46 UTC
Updated2026-05-03 07:16:22 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync hci_conn lookup and field access must be covered by hdev lock in set_cig_params_sync, otherwise it's possible it is freed concurrently. Take hdev lock to prevent hci_conn from being deleted or modified concurrently. Just RCU lock is not suitable here, as we also want to avoid "tearing" in the configuration.

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: 0.000180000 probability, percentile 0.046600000 (date 2026-05-02)

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 a091289218202bc09d9b9caa8afcde1018584aec 66d432e9b45bae7881ffcdb12cd8fd0bf254ef02 git Not specified
CNA Linux Linux affected a091289218202bc09d9b9caa8afcde1018584aec 7d568fede8eac91161a60b710aa920abe9b0fb9f git Not specified
CNA Linux Linux affected a091289218202bc09d9b9caa8afcde1018584aec bad65b4b0a96139f023eadc28a33125963208449 git Not specified
CNA Linux Linux affected a091289218202bc09d9b9caa8afcde1018584aec a2639a7f0f5bf7d73f337f8f077c19415c62ed2c git Not specified
CNA Linux Linux affected 3a273cd0f47dd672d37736e623849374f9ab9ce9 git Not specified
CNA Linux Linux affected d8570c4c3f2a3e51b3c8b5e6ec898364c5c03062 git Not specified
CNA Linux Linux affected 6.6 Not specified
CNA Linux Linux unaffected 6.6 semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a2639a7f0f5bf7d73f337f8f077c19415c62ed2c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/66d432e9b45bae7881ffcdb12cd8fd0bf254ef02 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bad65b4b0a96139f023eadc28a33125963208449 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7d568fede8eac91161a60b710aa920abe9b0fb9f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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