Bluetooth: hci_sync: annotate data-races around hdev->req_status

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Summary

CVECVE-2026-43119
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 10:16:25 UTC
Updated2026-05-12 21:36:28 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: annotate data-races around hdev->req_status __hci_cmd_sync_sk() sets hdev->req_status under hdev->req_lock: hdev->req_status = HCI_REQ_PEND; However, several other functions read or write hdev->req_status without holding any lock: - hci_send_cmd_sync() reads req_status in hci_cmd_work (workqueue) - hci_cmd_sync_complete() reads/writes from HCI event completion - hci_cmd_sync_cancel() / hci_cmd_sync_cancel_sync() read/write - hci_abort_conn() reads in connection abort path Since __hci_cmd_sync_sk() runs on hdev->req_workqueue while hci_send_cmd_sync() runs on hdev->workqueue, these are different workqueues that can execute concurrently on different CPUs. The plain C accesses constitute a data race. Add READ_ONCE()/WRITE_ONCE() annotations on all concurrent accesses to hdev->req_status to prevent potential compiler optimizations that could affect correctness (e.g., load fusing in the wait_event condition or store reordering).

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f80c5dad7b6467b884c445ffea45985793b4b2d0 6e539907c0d11f514c5e0b049b27b04dff48a5b1 git Not specified
CNA Linux Linux affected f80c5dad7b6467b884c445ffea45985793b4b2d0 a7a1cdb4a64ca74eb95cc46648fccb8cd3f9af27 git Not specified
CNA Linux Linux affected f80c5dad7b6467b884c445ffea45985793b4b2d0 40734ce8efc34c4a0d0222855798c0dc14b65f2e git Not specified
CNA Linux Linux affected f80c5dad7b6467b884c445ffea45985793b4b2d0 b6807cfc195ef99e1ac37b2e1e60df40295daa8c git Not specified
CNA Linux Linux affected 8603d49906b231bbcd9141db7d096fa1041bc379 git Not specified
CNA Linux Linux affected 0e061885bfcd65ef5d09f154f3c3c3491cc7544a git Not specified
CNA Linux Linux affected a3d50fb7ce931f08a2c6194fdc4c9a56c9ed4153 git Not specified
CNA Linux Linux affected 5.2 Not specified
CNA Linux Linux unaffected 5.2 semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6e539907c0d11f514c5e0b049b27b04dff48a5b1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b6807cfc195ef99e1ac37b2e1e60df40295daa8c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/40734ce8efc34c4a0d0222855798c0dc14b65f2e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a7a1cdb4a64ca74eb95cc46648fccb8cd3f9af27 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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