CVE-2026-43494

Description

In the Linux kernel, the following vulnerability has been resolved: net/rds: reset op_nents when zerocopy page pin fails When iov_iter_get_pages2() fails in rds_message_zcopy_from_user(), the pinned pages are released with put_page(), and rm->data.op_mmp_znotifier is cleared. But we fail to properly clear rm->data.op_nents. Later when rds_message_purge() is called from rds_sendmsg() the cleanup loop iterates over the incorrectly non zero number of op_nents and frees them again. Fix this by properly resetting op_nents when it should be in rds_message_zcopy_from_user().

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 10:49 UTC
Last updated: 2026-05-21 10:49 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/43xxx/CVE-2026-43494.json
Linked Threat: CVE-2026-43494 — CVE-2026-43494

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 12:16:19 UTC
NVD last modified: 2026-05-21 16:16:23 UTC
EPSS score: 0.0003 (probability of exploitation in next 30 days)
EPSS percentile: 9.95% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

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-2026-31267
Assigner: Linux
Published: May 21, 2026, 10:49:21 AM
Updated: May 30, 2026, 10:45:08 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 (patch: 7.1-rc4)

Linux (patch: 7.0.10)

Linux (0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 <640e37f58f991546a87540d067279c2c1fa9fe51)

Linux (0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 <290e833d1acb1093bc121fcdc97f5e6161157479)

Linux (4.17)

Linux (0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 <9115669faedccdda100428e2d26fd0aac8c50799)

Linux (0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 <0bbbff00a15b1df2cac9014d6cf4b6890f473353)

Linux (patch: 6.6.141)

Linux (0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 <e174929793195e0cd6a4adb0cad731b39f9019b4)

Linux (patch: 0)

Linux (patch: 6.18.33)

Linux (patch: 6.12.91)
Aliases: GHSA-m5w6-2mrp-4227

ENISA description: In the Linux kernel, the following vulnerability has been resolved: net/rds: reset op_nents when zerocopy page pin fails When iov_iter_get_pages2() fails in rds_message_zcopy_from_user(), the pinned pages are released with put_page(), and rm->data.op_mmp_znotifier is cleared. But we fail to properly clear rm->data.op_nents. Later when rds_message_purge() is called from rds_sendmsg() the cleanup loop iterates over the incorrectly non zero number of op_nents and frees them again. Fix this by properly resetting op_nents when it should be in rds_message_zcopy_from_user().

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)	—
Linux	Linux	`4.17` (affected), `0` (unaffected), `7.1-rc4` (unaffected)	—

Vendor references (1)

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

https://git.kernel.org/stable/c/e174929793195e0cd6a4adb0cad731b39f9019b4

MITRE references (1) cveawg.mitre.org

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

https://github.com/v12-security/pocs/tree/main/pintheft

Web references (14)

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

None Available msrc
MSRC update guide: CVE-2026-43494 msrc
https://git.kernel.org/stable/c/290e833d1acb1093bc121fcdc97f5e6161157479 tenable:git.kernel.org
https://git.kernel.org/stable/c/640e37f58f991546a87540d067279c2c1fa9fe51 tenable:git.kernel.org
https://git.kernel.org/stable/c/9115669faedccdda100428e2d26fd0aac8c50799 tenable:git.kernel.org
https://git.kernel.org/stable/c/c6e51512a784c4a7b86e1a044988696e3b3721fa tenable:git.kernel.org
https://git.kernel.org/stable/c/d84ce1786ce40fdd3dd98db47aec5527817e1ef6 tenable:git.kernel.org
https://git.kernel.org/stable/c/e174929793195e0cd6a4adb0cad731b39f9019b4 tenable:git.kernel.org
https://nvd.nist.gov/vuln/detail/CVE-2026-43494 tenable:nvd.nist.gov
https://www.cve.org/CVERecord?id=CVE-2026-43494 tenable:www.cve.org
http://www.openwall.com/lists/oss-security/2026/05/21/2 tenable:www.openwall.com
https://www.first.org/epss/ tenable:www.first.org
https://git.kernel.org/stable/c/03014551938a0887fa55f18ce49b70158a9c0113 tenable:git.kernel.org
https://git.kernel.org/stable/c/0bbbff00a15b1df2cac9014d6cf4b6890f473353 tenable:git.kernel.org

NVD-tagged references (2)

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

http://www.openwall.com/lists/oss-security/2026/05/21/2 af854a3a-2127-422b-91ae-364da2661108
https://git.kernel.org/stable/c/e174929793195e0cd6a4adb0cad731b39f9019b4 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Remediations (18)

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

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.

2026-05-21 17:21 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.

2026-05-21 17:21 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.

2026-05-21 17:21 UTC
Security Update Guide - Microsoft Security Response Center

web:msrc.microsoft.com

Security Update Guide - Microsoft Security Response Center

2026-05-21 17:21 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.

2026-05-21 17:21 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.

2026-05-21 17:21 UTC
Critical Patches Issued for Microsoft Products, April 14, 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 ...

2026-05-21 17:21 UTC
Microsoft April 2026 Patch Tuesday fixes 167 ... - Notebookcheck

web:www.notebookcheck.net

Microsoft April 2026 Patch Tuesday fixes 167 vulnerabilities, including an actively exploited SharePoint zero-day. Windows 11 KB5083769 and KB5082052 bring new builds and RDP security.

2026-05-21 17:21 UTC
Microsoft fixes 167 security flaws in April, second biggest Patch ...

web:www.pcworld.com

This month's Patch Tuesday includes an actively exploited Office zero-day vulnerability and several critical RCE bugs in Windows and Remote Desktop.

2026-05-21 17:21 UTC
CVE-2026-43494 Common Vulnerabilities and Exposures | SUSE

web:www.suse.com

Secure your Linux systems from CVE-2026-43494 . Stay ahead of potential threats with the latest security updates from SUSE.

2026-05-21 17:21 UTC
cve-details - Red Hat Customer Portal

web:access.redhat.com

Learn about our open source products, services, and company. You are here

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
CVE-2026-43494 / PinTheft: Local Privilege Escalation Risk from Linux ...

web:knightli.com

A practical summary of CVE-2026-43494 / PinTheft: how a Linux RDS zerocopy reference-counting issue can combine with io_uring fixed buffers into a local privilege escalation chain, and how administrators can assess prerequisites, reduce exposure, and wait for distribution fixes.

2026-06-03 22:32 UTC
Nvd - Cve-2026-43493

web:nvd.nist.gov

Description In the Linux kernel, the following vulnerability has been resolved: crypto: pcrypt - Fix handling of MAY_BACKLOG requests MAY_BACKLOG requests can return EBUSY. Handle them by checking for that value and filtering out EINPROGRESS notifications.

2026-06-03 22:32 UTC
Portal for ArcGIS Security 2026 Update 1 Patch - Esri Support

web:support.esri.com

The C version of this patch also includes additional bug fixes not related to security, refer to the updated Issues Addressed with this Patch section for the latest details. April 20, 2026 : The 11.4 version of the Portal for ArcGIS Security 2026 Update 1 Patch is now available.

2026-06-03 22:32 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.

2026-06-03 22:32 UTC
CVE-2026-43494 - High Vulnerability - TheHackerWire

web:www.thehackerwire.com

How do I fix or mitigate CVE-2026-43494 ? To protect against CVE-2026-43494 , you should: (1) Apply the latest security patches from the vendor, (2) Check official security advisories for specific remediation steps, (3) Update affected software to the latest version, and (4) Monitor your systems for any signs of exploitation.

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

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-43494.json.

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          "product": "Linux",
          "programFiles": [
            "net/rds/message.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e174929793195e0cd6a4adb0cad731b39f9019b4",
              "status": "affected",
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            },
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: reset op_nents when zerocopy page pin fails\n\nWhen iov_iter_get_pages2() fails in rds_message_zcopy_from_user(),\nthe pinned pages are released with put_page(), and\nrm->data.op_mmp_znotifier is cleared.  But we fail to properly\nclear rm->data.op_nents.\n\nLater when rds_message_purge() is called from rds_sendmsg() the\ncleanup loop iterates over the incorrectly non zero number of\nop_nents and frees them again.\n\nFix this by properly resetting op_nents when it should be in\nrds_message_zcopy_from_user()."
        }
      ],
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        {
          "url": "https://git.kernel.org/stable/c/e174929793195e0cd6a4adb0cad731b39f9019b4"
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    "datePublished": "2026-05-21T10:49:21.310Z",
    "dateReserved": "2026-05-01T14:12:56.013Z",
    "dateUpdated": "2026-05-21T10:49:21.310Z",
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