CVE-2026-43061

Serial transmission halt via uncleared DMA state

Published May 5, 2026 · Updated May 5, 2026

Improper locking in the 8250 UART DMA path in the Linux Kernel allows local users to halt serial transmission after a canceled transfer. serial8250_tx_dma_flush calls dmaengine_terminate_async but leaves dma->tx_running set when cancellation produces no __dma_tx_complete callback. Low-privileged local access and an affected 8250 UART using DMA are required; the stuck state prevents subsequent TX DMA scheduling and halts serial output.

CVSS severity5.5
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the 8250 UART DMA path in the Linux Kernel allows local users to halt serial transmission after a canceled transfer. serial8250_tx_dma_flush calls dmaengine_terminate_async but leaves dma->tx_running set when cancellation produces no __dma_tx_complete callback. Low-privileged local access and an affected 8250 UART using DMA are required; the stuck state prevents subsequent TX DMA scheduling and halts serial output.

The record

CVE
CVE-2026-43061
Published
May 5, 2026
Updated
May 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 5, 2026CVE publishedPublication date reported by the CVE source.
  2. May 5, 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=59f751db7f392fa7a58cbd972205982f7f4f5854
  2. Affected versionversion=5e00346deb7bf40a4cf70e3716ac8e9a2409eb55 <d2719a0a9c3439abf67843a5504b7afccd9ded93
  3. Affected versionversion=6.14
  4. Affected versionversion=7c47e637dfadfbc691dd297b91d81ef939ca2080 <8190f9ab6ad90cb97652adbebd238b874a4ef70d
  5. Affected versionversion=9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 <5f6b17562f03fc65c7d3474ef8f1959b19d1ca41
  6. Affected versionversion=9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 <a424a34b8faddf97b5af41689087e7a230f79ba7
  7. Affected versionversion=9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 <b5ad887339503103d0fbe9827b16ad287597c275
  8. Affected versionversion=bbec5998d7bd349730f59c959a8b00cfff816e34
  9. Affected versionversion=bf3f395b9c37956eca866c9e1679769ed7dcce68 <79a19bd936bb35f56ef0ccab1b3b59ebce8c762d
  10. Affected versionversion=c8a52c772c7c6de72257a435bcad03d3bb914a70 <2a72403b985aea6b4aac3171830492f9a387f9e1
  11. Affected versionversion=d470522c597b73e63cca04f3012aec28185113b7 <f76d91271bcacbd759a2e4ee3ea61faa6a727ccf

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=59f751db7f392fa7a58cbd972205982f7f4f5854; version=5e00346deb7bf40a4cf70e3716ac8e9a2409eb55 <d2719a0a9c3439abf67843a5504b7afccd9ded93; version=6.14; version=7c47e637dfadfbc691dd297b91d81ef939ca2080 <8190f9ab6ad90cb97652adbebd238b874a4ef70d; version=9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 <5f6b17562f03fc65c7d3474ef8f1959b19d1ca41; version=9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 <a424a34b8faddf97b5af41689087e7a230f79ba7; version=9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 <b5ad887339503103d0fbe9827b16ad287597c275; version=bbec5998d7bd349730f59c959a8b00cfff816e34; version=bf3f395b9c37956eca866c9e1679769ed7dcce68 <79a19bd936bb35f56ef0ccab1b3b59ebce8c762d; version=c8a52c772c7c6de72257a435bcad03d3bb914a70 <2a72403b985aea6b4aac3171830492f9a387f9e1; version=d470522c597b73e63cca04f3012aec28185113b7 <f76d91271bcacbd759a2e4ee3ea61faa6a727ccf

Published CVSS scores

5.5NIST NVDCVSS: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

CWE-667Improper Locking
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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