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CVE-2026-43061

📛 CVE Title

serial: 8250: Fix TX deadlock when using DMA

⬇ Download JSON ⚠ View as Threat

Description

In the Linux kernel, the following vulnerability has been resolved: serial: 8250: Fix TX deadlock when using DMA `dmaengine_terminate_async` does not guarantee that the `__dma_tx_complete` callback will run. The callback is currently the only place where `dma->tx_running` gets cleared. If the transaction is canceled and the callback never runs, then `dma->tx_running` will never get cleared and we will never schedule new TX DMA transactions again. This change makes it so we clear `dma->tx_running` after we terminate the DMA transaction. This is "safe" because `serial8250_tx_dma_flush` is holding the UART port lock. The first thing the callback does is also grab the UART port lock, so access to `dma->tx_running` is serialized.

Overview

State
PUBLISHED
Assigner (CNA)
Linux
CVSS severity
high
CVSS score
CVSS 7.8 / 10 7.8 7.8 / 10
CVSS vector
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Effective score
7.8 / 10 HIGH source: CNA overview
CWE(s)
—
Reserved
2026-05-01
Published
2026-05-05 17:17 UTC
Last updated
2026-05-12 00:16 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/43xxx/CVE-2026-43061.json
Linked Threat
CVE-2026-43061 — CVE-2026-43061

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published
2026-05-05 16:16:15 UTC
NVD last modified
2026-05-06 13:08:07 UTC
EPSS score
0.0003 (probability of exploitation in next 30 days)
EPSS percentile
9.59% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

NVD / KEV / EPSS data refreshed 2026-05-25 09:10 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2026-27355
Assigner
Linux
Published
May 5, 2026, 3:17:27 PM
Updated
May 23, 2026, 4:06:10 PM
EUVD base score
0.0 / 10
EUVD-reported EPSS
0.0100
Vendors
Linux
Products
Linux (6.6.79 <6.6.130)
Linux (patch: 7.0)
Linux (6.12.16 <6.12.78)
Linux (patch: 6.1.167)
Linux (6.1.129 <6.1.167)
Linux (patch: 0)
Linux (6.14)
Linux (6.13.4 <6.14)
Linux (5.10.235 <5.10.253)
Linux (patch: 6.12.78)
Linux (59f751db7f392fa7a58cbd972205982f7f4f5854)
Linux (bbec5998d7bd349730f59c959a8b00cfff816e34)
Linux (5.4.291 <5.5)
Linux (patch: 5.15.203)
Linux (c8a52c772c7c6de72257a435bcad03d3bb914a70 <2a72403b985aea6b4aac3171830492f9a387f9e1)
Linux (7c47e637dfadfbc691dd297b91d81ef939ca2080 <8190f9ab6ad90cb97652adbebd238b874a4ef70d)
Linux (patch: 6.6.130)
Linux (5.15.179 <5.15.203)
Linux (bf3f395b9c37956eca866c9e1679769ed7dcce68 <79a19bd936bb35f56ef0ccab1b3b59ebce8c762d)
Linux (patch: 5.10.253)
Linux (5e00346deb7bf40a4cf70e3716ac8e9a2409eb55 <d2719a0a9c3439abf67843a5504b7afccd9ded93)
Linux (9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 <b5ad887339503103d0fbe9827b16ad287597c275)
Linux (9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 <5f6b17562f03fc65c7d3474ef8f1959b19d1ca41)
Linux (9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 <a424a34b8faddf97b5af41689087e7a230f79ba7)
Linux (patch: 6.18.20)
Linux (patch: 6.19.10)
Linux (d470522c597b73e63cca04f3012aec28185113b7 <f76d91271bcacbd759a2e4ee3ea61faa6a727ccf)

ENISA description: In the Linux kernel, the following vulnerability has been resolved: serial: 8250: Fix TX deadlock when using DMA `dmaengine_terminate_async` does not guarantee that the `__dma_tx_complete` callback will run. The callback is currently the only place where `dma->tx_running` gets cleared. If the transaction is canceled and the callback never runs, then `dma->tx_running` will never get cleared and we will never schedule new TX DMA transactions again. This change makes it so we clear `dma->tx_running` after we terminate the DMA transaction. This is "safe" because `serial8250_tx_dma_flush` is holding the UART port lock. The first thing the callback does is also grab the UART port lock, so access to `dma->tx_running` is serialized.

EUVD references (8)

Affected products (2)
VendorProductVersionsPlatforms
Linux Linux 7c47e637dfadfbc691dd297b91d81ef939ca2080 (affected), bf3f395b9c37956eca866c9e1679769ed7dcce68 (affected), d470522c597b73e63cca04f3012aec28185113b7 (affected), 5e00346deb7bf40a4cf70e3716ac8e9a2409eb55 (affected), c8a52c772c7c6de72257a435bcad03d3bb914a70 (affected), 9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 (affected), 9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 (affected), 9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 (affected), bbec5998d7bd349730f59c959a8b00cfff816e34 (affected), 59f751db7f392fa7a58cbd972205982f7f4f5854 (affected) —
Linux Linux 6.14 (affected), 0 (unaffected), 5.10.253 (unaffected), 5.15.203 (unaffected), 6.1.167 (unaffected), 6.6.130 (unaffected), 6.12.78 (unaffected), 6.18.20 (unaffected), 6.19.10 (unaffected), 7.0 (unaffected) —

Vendor references (8)

References embedded in the original CVE record by the assigning CNA.

MITRE references (8) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

Web references (5)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

NVD-tagged references (8)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

Remediations (19)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

  • THREAT ADVISORY RedSun Zero-Day (Windows Defender) April 17, 2026
    web:blackswan-cybersecurity.com

    Cloud Files API activity originating outside legitimate OneDrive/sync processes. Mitigation Steps: Apply all Windows updates immediately (monitor MSRC for an emergency RedSun-specific patch . None released as of April 17, 2026 ). Supplement Defender with a secondary EDR solution (e.g., Huntress) capable of detecting Defender bypasses.

    2026-05-23 21:14 UTC
  • Microsoft and Adobe Patch Tuesday, April 2026 Security Update Review
    web:blog.qualys.com

    With Qualys Policy Audit's out-of-the-box mitigation or Compensatory Controls, which reduce the risk of a vulnerability being exploited because the remediation ( fix / patch ) cannot be done immediately, these security controls are not recommended by any industry standards, such as CIS and DISA-STIG.

    2026-05-23 21:14 UTC
  • CISA Warns of Exploited Microsoft Defender 0-Day Flaws
    web:cyberpress.org

    The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added two actively exploited Microsoft Defender vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog, issuing an urgent remediation directive for federal agencies with a due date of June 3, 2026 .

    2026-05-23 21:14 UTC
  • Security Update Guide - Microsoft
    web:portal.msrc.microsoft.com

    The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

    2026-05-23 21:14 UTC
  • Microsoft Issues Second Biggest Patch Tuesday Ever in April
    web:redmondmag.com

    Microsoft this week released one of the largest Patch Tuesday bundles in its history, delivering fixes for 163 new Microsoft CVEs in a month that includes three zero-days and eight Critical-rated ...

    2026-05-23 21:14 UTC
  • Microsoft warns of new Defender zero-days exploited in attacks
    web:www.bleepingcomputer.com

    On Wednesday, Microsoft started rolling out security patches for two Defender vulnerabilities that have been exploited in zero-day attacks.

    2026-05-23 21:14 UTC
  • February 2026 Patch Tuesday: Updates and Analysis | CrowdStrike
    web:www.crowdstrike.com

    Microsoft's February 2026 Patch Tuesday addresses 59 CVEs , featuring six exploited vulnerabilities, three of which were publicly known, and five Critical vulnerabilities.

    2026-05-23 21:14 UTC
  • 2 New Microsoft Defender Zero-Days Exploited—Patch Now ... - Forbes
    web:www.forbes.com

    Microsoft has confirmed an emergency security update as CISA warns that two new Defender zero-days are being exploited by attackers.

    2026-05-23 21:14 UTC
  • Oracle Critical Patch Update Advisory - April 2026
    web:www.oracle.com

    This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

    2026-05-23 21:14 UTC
  • Microsoft's March 2026 update fixes 80+ security vulnerabilities
    web:www.pcworld.com

    This month's Patch Tuesday brings over 80 fixes for various security vulnerabilities. Fortunately, none are actively being exploited in the wild yet.

    2026-05-23 21:14 UTC
  • Microsoft Patch Tuesday for April 2026 - Snort Rule and Prominent ...
    web:blog.talosintelligence.com

    Microsoft has released its monthly security update for April 2026 , which includes 165 vulnerabilities affecting a wide range of products, including eight Microsoft marked as "critical." CVE - 2026 -23666 is a critical Denial of Service (DoS) vulnerability that affects the .NET framework. Successful exploitation could allow the attacker to deny service over the network. CVE - 2026 -32157 is a ...

    2026-06-03 07:49 UTC
  • April 2026 Critical Patch Update Released | security - Oracle Blogs
    web:blogs.oracle.com

    For more information about the Critical Patch Update program, see the security vulnerability remediation practices page located on the Oracle Trust Center.

    2026-06-03 07:49 UTC
  • Zero-Day Threat Report May 2026 - CVEs, Exploits & Remediation ...
    web:carthageelectronics.com

    Status: Actively exploited — CISA KEV listed — patch by May 12, 2026 What Happened On April 28, 2026 , CISA added CVE - 2026 -32202 to its Known Exploited Vulnerabilities (KEV) catalog with a federal remediation deadline of May 12, 2026 . This vulnerability is the result of an incomplete patch Microsoft released in February for CVE - 2026 -21510.

    2026-06-03 07:49 UTC
  • Microsoft Patch Tuesday April 2026 - 168 Vulnerabilities Fixed ...
    web:cybersecuritynews.com

    Microsoft has released its April 2026 Patch Tuesday security update, addressing 168 vulnerabilities across its product portfolio including one actively exploited zero-day and one publicly disclosed flaw that organizations must prioritize immediately.

    2026-06-03 07:49 UTC
  • Security Update Guide - Microsoft
    web:msrc.microsoft.com

    The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

    2026-06-03 07:49 UTC
  • About the security content of Background Security Improvements for iOS ...
    web:support.apple.com

    This document describes the content of Background Security Improvements.

    2026-06-03 07:49 UTC
  • Microsoft April 2026 Patch Tuesday fixes 167 flaws, 2 zero-days
    web:www.bleepingcomputer.com

    Today is Microsoft's April 2026 Patch Tuesday with security updates for 167 flaws, including 2 zero-day vulnerabilities.

    2026-06-03 07:49 UTC
  • April 2026 Patch Tuesday: Updates and Analysis | CrowdStrike
    web:www.crowdstrike.com

    Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.

    2026-06-03 07:49 UTC
  • Oracle Patches 450 Vulnerabilities With April 2026 CPU
    web:www.securityweek.com

    Oracle on Tuesday announced the release of 481 new security patches as part of its April 2026 Critical Patch Update (CPU). Across the 28 product families that received security updates, more than 300 patches address vulnerabilities that are remotely exploitable without authentication. Roughly three dozen fixes resolve critical-severity security defects. There appear to be approximately 450 ...

    2026-06-03 07:49 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-43061.json.

{
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: 8250: Fix TX deadlock when using DMA\n\n`dmaengine_terminate_async` does not guarantee that the\n`__dma_tx_complete` callback will run. The callback is currently the\nonly place where `dma->tx_running` gets cleared. If the transaction is\ncanceled and the callback never runs, then `dma->tx_running` will never\nget cleared and we will never schedule new TX DMA transactions again.\n\nThis change makes it so we clear `dma->tx_running` after we terminate\nthe DMA transaction. This is \"safe\" because `serial8250_tx_dma_flush`\nis holding the UART port lock. The first thing the callback does is also\ngrab the UART port lock, so access to `dma->tx_running` is serialized."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:16:57.512Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/79a19bd936bb35f56ef0ccab1b3b59ebce8c762d"
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        {
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          "url": "https://git.kernel.org/stable/c/2a72403b985aea6b4aac3171830492f9a387f9e1"
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        },
        {
          "url": "https://git.kernel.org/stable/c/a424a34b8faddf97b5af41689087e7a230f79ba7"
        }
      ],
      "title": "serial: 8250: Fix TX deadlock when using DMA",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43061",
    "datePublished": "2026-05-05T15:17:27.079Z",
    "dateReserved": "2026-05-01T14:12:55.981Z",
    "dateUpdated": "2026-05-11T22:16:57.512Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}