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Linux KernelOperating system · Linux

CVE-2026-43119

MEDIUM · 5.5 CVSS v3.1 Published 2026-05-06
Fix available
A fix is available. Upgrade to 6.12.83 / 6.18.24 or later.
See remediation →
57/100
Remediation priority · Elevated
Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
In 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).

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Linux KernelOperating system
Affected:>= 5.2, < 6.12.83>= 6.13, < 6.18.24>= 6.19, < 6.19.14= 7.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 6.12.83 / 6.18.24 / 6.19.14 or later
Fixed in 6.12.836.18.246.19.14
Vendor patch git.kernel.org →
Recommended fix High confidence
  1. Obtain the patch from the stable commit: https://git.kernel.org/stable/c/40734ce8efc34c4a0d0222855798c0dc14b65f2e
  2. Identify affected files that access hdev->req_status, primarily net/bluetooth/hci_sync.c and related Bluetooth HCI files
  3. Apply the patch which adds WRITE_ONCE() to writes of hdev->req_status (e.g., in __hci_cmd_sync_sk)
  4. Apply the patch which adds READ_ONCE() to reads of hdev->req_status (e.g., in hci_send_cmd_sync, hci_cmd_sync_complete, hci_cmd_sync_cancel, hci_cmd_sync_cancel_sync, hci_abort_conn)
  5. Rebuild and deploy the kernel or apply the patch via the distribution's kernel update mechanism

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-43119 in production — separate from our analysis above.

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What this is

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