CVE-2026-43119

Availability loss via unsynchronized request status accesses

Published May 6, 2026 · Updated May 6, 2026

Race condition in Linux Kernel Bluetooth HCI synchronization allows local users to impair request processing through concurrent command paths. The send, completion, cancellation, and connection-abort paths access hdev->req_status with plain C reads or writes outside req_lock while separate workqueues can run on different CPUs, permitting load fusion or store reordering. Low-privileged local access is required, and the published impact is limited to availability without data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux Kernel Bluetooth HCI synchronization allows local users to impair request processing through concurrent command paths. The send, completion, cancellation, and connection-abort paths access hdev->req_status with plain C reads or writes outside req_lock while separate workqueues can run on different CPUs, permitting load fusion or store reordering. Low-privileged local access is required, and the published impact is limited to availability without data disclosure or modification.

The record

CVE
CVE-2026-43119
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <40734ce8efc34c4a0d0222855798c0dc14b65f2e
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6e539907c0d11f514c5e0b049b27b04dff48a5b1
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a7a1cdb4a64ca74eb95cc46648fccb8cd3f9af27
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b6807cfc195ef99e1ac37b2e1e60df40295daa8c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <40734ce8efc34c4a0d0222855798c0dc14b65f2e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6e539907c0d11f514c5e0b049b27b04dff48a5b1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a7a1cdb4a64ca74eb95cc46648fccb8cd3f9af27; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b6807cfc195ef99e1ac37b2e1e60df40295daa8c

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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