CVE-2026-43502

CVEs › CVE-2026-43502

Description

In the Linux kernel, the following vulnerability has been resolved: net/rds: handle zerocopy send cleanup before the message is queued A zerocopy send can fail after user pages have been pinned but before the message is attached to the sending socket. The purge path currently infers zerocopy state from rm->m_rs, so an unqueued message can be cleaned up as if it owned normal payload pages. However, zerocopy ownership is really determined by the presence of op_mmp_znotifier, regardless of whether the message has reached the socket queue. Capture op_mmp_znotifier up front in rds_message_purge() and use it as the cleanup discriminator. If the message is already associated with a socket, keep the existing completion path. Otherwise, drop the pinned page accounting directly and release the notifier before putting the payload pages. This keeps early send failure cleanup consistent with the zerocopy lifetime rules without changing the normal queued completion path.

Overview

State: PUBLISHED
Assigner (CNA): Linux
CVSS severity: high
CVSS score: 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
MSRC score: 5.5 / 10 MEDIUM MS rating: Moderate
CWE(s): —
Reserved: 2026-05-01
Published: 2026-05-21 12:17 UTC
Last updated: 2026-05-21 12:17 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/43xxx/CVE-2026-43502.json
Linked Threat: CVE-2026-43502 — CVE-2026-43502

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: 2026-05-21 13:16:19 UTC
NVD last modified: 2026-05-21 13:16:19 UTC
EPSS score: 0.0002 (probability of exploitation in next 30 days)
EPSS percentile: 7.22% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

NVD / KEV / EPSS data refreshed 2026-05-25 00:27 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-2026-31275
Assigner: Linux
Published: May 21, 2026, 12:17:50 PM
Updated: May 30, 2026, 10:45:23 AM
EUVD base score (CVSS 3.1): 7.8 / 10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EUVD-reported EPSS: 0.0100
Vendors: Linux
Products: Linux (0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 <14ef6fd18db2494098b21e0471bf27a1d8e9993e)

Linux (patch: 7.0.7)

Linux (0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 <21d70744e6d3bbf9293aa1ee6fba7c53ad75275e)

Linux (patch: 6.6.140)

Linux (0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 <3abc8983b2bae3f487f77d9da5527d7d6b210d46)

Linux (patch: 6.12.88)

Linux (patch: 7.1-rc3)

Linux (patch: 6.18.30)

Linux (0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 <0f5c185fc79a59ee9991234dd6d2a3e5afa6e75b)

Linux (4.17)

Linux (0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 <44b550d88b267320459d518c0743a241ab2108fa)

Linux (patch: 0)
Aliases: GHSA-mhq7-fqmq-29pq

ENISA description: In the Linux kernel, the following vulnerability has been resolved: net/rds: handle zerocopy send cleanup before the message is queued A zerocopy send can fail after user pages have been pinned but before the message is attached to the sending socket. The purge path currently infers zerocopy state from rm->m_rs, so an unqueued message can be cleaned up as if it owned normal payload pages. However, zerocopy ownership is really determined by the presence of op_mmp_znotifier, regardless of whether the message has reached the socket queue. Capture op_mmp_znotifier up front in rds_message_purge() and use it as the cleanup discriminator. If the message is already associated with a socket, keep the existing completion path. Otherwise, drop the pinned page accounting directly and release the notifier before putting the payload pages. This keeps early send failure cleanup consistent with the zerocopy lifetime rules without changing the normal queued completion path.

EUVD references (5)

Microsoft Security Response Center MSRC

Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-08-12 01:09 UTC (source: CVRF).

MS severity: Moderate
MS CVSS base score: 5.5 / 10 (temporal 5.5)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Release: 2026-May

Microsoft remediations / KB articles (2)

CBL-Mariner Releases — Vendor Fix / Security Update (fixed build 6.6.141.1-1)
https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade — None Available / CBL-Mariner Releases

Affected products (2)

Vendor	Product	Versions	Platforms
Linux	Linux	`0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3` (affected), `0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3` (affected), `0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3` (affected), `0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3` (affected), `0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3` (affected)	—
Linux	Linux	`4.17` (affected), `0` (unaffected), `6.6.140` (unaffected), `6.12.88` (unaffected), `6.18.30` (unaffected), `7.0.7` (unaffected), `7.1-rc3` (unaffected)	—

Vendor references (5)

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

Web references (13)

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

MSRC update guide: CVE-2026-43502 msrc
None Available msrc
https://git.kernel.org/stable/c/1e262db7675e27f42c3f3f47d6011855f4454f24 tenable:git.kernel.org
https://git.kernel.org/stable/c/21d70744e6d3bbf9293aa1ee6fba7c53ad75275e tenable:git.kernel.org
https://git.kernel.org/stable/c/3abc8983b2bae3f487f77d9da5527d7d6b210d46 tenable:git.kernel.org
https://git.kernel.org/stable/c/44b550d88b267320459d518c0743a241ab2108fa tenable:git.kernel.org
https://git.kernel.org/stable/c/46662f7dc59475995609bf3e9d27eb36f4acf26f tenable:git.kernel.org
https://git.kernel.org/stable/c/e9aefdc5c53fe9aed108c14e3d155710a1bb14c9 tenable:git.kernel.org
https://nvd.nist.gov/vuln/detail/CVE-2026-43502 tenable:nvd.nist.gov
https://www.cve.org/CVERecord?id=CVE-2026-43502 tenable:www.cve.org
https://git.kernel.org/stable/c/0f5c185fc79a59ee9991234dd6d2a3e5afa6e75b tenable:git.kernel.org
https://www.first.org/epss/ tenable:www.first.org
https://git.kernel.org/stable/c/14ef6fd18db2494098b21e0471bf27a1d8e9993e tenable:git.kernel.org

NVD-tagged references (5)

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

https://git.kernel.org/stable/c/0f5c185fc79a59ee9991234dd6d2a3e5afa6e75b 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/14ef6fd18db2494098b21e0471bf27a1d8e9993e 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/21d70744e6d3bbf9293aa1ee6fba7c53ad75275e 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/3abc8983b2bae3f487f77d9da5527d7d6b210d46 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/44b550d88b267320459d518c0743a241ab2108fa 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Remediations (17)

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

CVE-2026-43502 - Vulnerability Details - OpenCVE

web:app.opencve.io

In the Linux kernel, the following vulnerability has been resolved: net/rds: handle zerocopy send cleanup before the message is queued A zerocopy send can fail after user pages have been pinned but before the message is attached to the sending socket. The purge path currently infers zerocopy state from rm->m_rs, so an unqueued message can be cleaned up as if it owned normal payload pages ...

2026-05-24 12:02 UTC
Dirty Frag (CVE-2026-43284, CVE-2026-43500): Mitigation and Kernel ...

web:blog.cloudlinux.com

Dirty Frag is a Linux kernel local privilege escalation in the xfrm subsystem. Apply the mitigation now while patched kernels and KernelCare livepatches are prepared.

2026-05-24 12:02 UTC
Security Advisory Bulletin 064 | Ubiquiti Community

web:community.ui.com

Published: May 21, 2026 Updated: May 22, 2026 Version: 1.1 Revision: 1.1 Summary 1 of 5 A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection. Affected Products: UniFi OS Server (Version 5.0.6 and earlier) Mitigation : Update your UniFi OS Server to Version 5.0.8 or later ...

2026-05-24 12:02 UTC
CVE-2026-43502 - Overview, Insights & Trends

web:cvemon.intruder.io

Get the latest on CVE-2026-43502 , including risk score and recommendations. Vulnerability intelligence on trending CVEs from multiple sources.

2026-05-24 12:02 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 .

2026-05-24 12:02 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.

2026-05-24 12:02 UTC
CVE-2026-43502 - vulmon.com

web:vulmon.com

Vulnerability Summary In the Linux kernel, the following vulnerability has been resolved: net/rds: handle zerocopy send cleanup before the message is queued A zerocopy send can fail after user pages have been pinned but before the message is attached to the sending socket. The purge path currently infers zerocopy state from rm->m_rs, so an unqueued message can be cleaned up as if it owned ...

2026-05-24 12:02 UTC
CVE-2026-43502 Linux RDS Zerocopy Cleanup Bug: What Windows Admins ...

web:windowsforum.com

CVE-2026-43502 is a newly published Linux kernel vulnerability, added to NVD on May 21, 2026 , involving Reliable Datagram Sockets zerocopy send cleanup when pinned user pages are released before a message reaches the socket queue. The bug is not a Windows Remote Desktop Services issue, despite the overloaded "RDS" acronym.

2026-05-24 12:02 UTC
Critical Patches Issued for Microsoft Products, May 12, 2026

web:www.cisecurity.org

<p>Multiple vulnerabilities have been discovered in Microsoft products, the most severe of which could allow for remote code execution. Successful exploitation of the most severe of these vulnerabilities could result in an attacker gaining the same privileges as the logged-on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or ...

2026-05-24 12:02 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.

2026-05-24 12:02 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.

2026-06-03 22:32 UTC
Microsoft Patch Tuesday May 2026 - 120 Vulnerabilities Fixed, Including ...

web:cybersecuritynews.com

Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.

2026-06-03 22:32 UTC
Landing Page | ServiceNow Common Vulnerabilities & Exposures (CVE ...

web:support.servicenow.com

Overview The advisories below document publicly disclosed Common Vulnerabilities and Exposures ( CVEs ) in the Now Platform by ServiceNow. Because ServiceNow uses various methods to communicate vulnerability information, patches, and other fixes, customers should review family, security patch , and hotfix release notes, which are available at https://docs.servicenow.com, for a complete list of ...

2026-06-03 22:32 UTC
Microsoft May 2026 Patch Tuesday Fixes 120 Flaws

web:thecyberexpress.com

Microsoft has rolled out its May 2026 Patch Tuesday security updates, delivering fixes for approximately 120 vulnerabilities across Windows, Microsoft Office, networking services, and enterprise platforms.

2026-06-03 22:32 UTC
Microsoft March 2026 Patch Tuesday fixes 2 zero-days, 79 flaws

web:www.bleepingcomputer.com

Today is Microsoft's March 2026 Patch Tuesday with security updates for 79 flaws, including 2 publicly disclosed zero-day vulnerabilities.

2026-06-03 22:32 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 22:32 UTC
Patch Tuesday June 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's June 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-06-03 22:32 UTC

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-43502.json.

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    "datePublished": "2026-05-21T12:17:50.444Z",
    "dateReserved": "2026-05-01T14:12:56.014Z",
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