CVE-2026-43484

CVEs › CVE-2026-43484

Description

In the Linux kernel, the following vulnerability has been resolved: mmc: core: Avoid bitfield RMW for claim/retune flags Move claimed and retune control flags out of the bitfield word to avoid unrelated RMW side effects in asynchronous contexts. The host->claimed bit shared a word with retune flags. Writes to claimed in __mmc_claim_host() or retune_now in mmc_mq_queue_rq() can overwrite other bits when concurrent updates happen in other contexts, triggering spurious WARN_ON(!host->claimed). Convert claimed, can_retune, retune_now and retune_paused to bool to remove shared-word coupling.

Overview

State: PUBLISHED
Assigner (CNA): Linux
CVSS severity: high
CVSS score: 7.1 / 10
CVSS vector: AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Effective score: 7.1 / 10 HIGH source: CNA overview
CWE(s): —
Reserved: 2026-05-01
Published: 2026-05-13 17:08 UTC
Last updated: 2026-05-13 17:08 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/43xxx/CVE-2026-43484.json
Linked Threat: CVE-2026-43484 — CVE-2026-43484

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: 2026-05-13 16:16:51 UTC
NVD last modified: 2026-05-13 16:16:51 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 08:51 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-2026-30020
Assigner: Linux
Published: May 13, 2026, 3:08:30 PM
Updated: May 13, 2026, 3:08:30 PM
EUVD base score: 0.0 / 10
EUVD-reported EPSS: 0.0300
Vendors: Linux
Products: Linux (6c0cedd1ef9527ef13e66875746570e76a3188a7 <270277c2ab631044867adb1bd2f2433d3892de6e)

Linux (6c0cedd1ef9527ef13e66875746570e76a3188a7 <bb7fc2498c3bb25fa6a91f22f4760005325cfbd5)

Linux (4.15)

Linux (6c0cedd1ef9527ef13e66875746570e76a3188a7 <45038e03f15e992c48603fff8c6b1c9be5397ac9)

Linux (patch: 7.0)

Linux (patch: 5.15.203)

Linux (6c0cedd1ef9527ef13e66875746570e76a3188a7 <d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc)

Linux (patch: 6.12.78)

Linux (patch: 6.19.9)

Linux (6c0cedd1ef9527ef13e66875746570e76a3188a7 <901084c51a0a8fb42a3f37d2e9c62083c495f824)

Linux (patch: 6.18.19)

Linux (6c0cedd1ef9527ef13e66875746570e76a3188a7 <0e06cc511c61cff1591e5435a207759adcc76b6d)

Linux (patch: 0)

Linux (patch: 6.1.167)

Linux (6c0cedd1ef9527ef13e66875746570e76a3188a7 <41dce4dae583a8ce06a7ebf4ce704c46a142957c)

Linux (patch: 6.6.130)

ENISA description: In the Linux kernel, the following vulnerability has been resolved: mmc: core: Avoid bitfield RMW for claim/retune flags Move claimed and retune control flags out of the bitfield word to avoid unrelated RMW side effects in asynchronous contexts. The host->claimed bit shared a word with retune flags. Writes to claimed in __mmc_claim_host() or retune_now in mmc_mq_queue_rq() can overwrite other bits when concurrent updates happen in other contexts, triggering spurious WARN_ON(!host->claimed). Convert claimed, can_retune, retune_now and retune_paused to bool to remove shared-word coupling.

EUVD references (7)

Affected products (2)

Vendor	Product	Versions	Platforms
Linux	Linux	`6c0cedd1ef9527ef13e66875746570e76a3188a7` (affected), `6c0cedd1ef9527ef13e66875746570e76a3188a7` (affected), `6c0cedd1ef9527ef13e66875746570e76a3188a7` (affected), `6c0cedd1ef9527ef13e66875746570e76a3188a7` (affected), `6c0cedd1ef9527ef13e66875746570e76a3188a7` (affected), `6c0cedd1ef9527ef13e66875746570e76a3188a7` (affected), `6c0cedd1ef9527ef13e66875746570e76a3188a7` (affected)	—
Linux	Linux	`4.15` (affected), `0` (unaffected), `5.15.203` (unaffected), `6.1.167` (unaffected), `6.6.130` (unaffected), `6.12.78` (unaffected), `6.18.19` (unaffected), `6.19.9` (unaffected), `7.0` (unaffected)	—

Vendor references (7)

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

MITRE references (7) 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.

https://attackerkb.com/topics/CVE-2026-43484 rapid7:attackerkb.com
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30020 rapid7:euvd.enisa.europa.eu
https://www.first.org/epss/ tenable:www.first.org
https://nvd.nist.gov/vuln/detail/CVE-2026-43484 tenable:nvd.nist.gov
https://www.cve.org/CVERecord?id=CVE-2026-43484 tenable:www.cve.org

NVD-tagged references (7)

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/0e06cc511c61cff1591e5435a207759adcc76b6d 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/270277c2ab631044867adb1bd2f2433d3892de6e 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/41dce4dae583a8ce06a7ebf4ce704c46a142957c 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/45038e03f15e992c48603fff8c6b1c9be5397ac9 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/901084c51a0a8fb42a3f37d2e9c62083c495f824 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/bb7fc2498c3bb25fa6a91f22f4760005325cfbd5 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Remediations (18)

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

RHSB-2026-003 Networking subsystem Privilege Escalation - Linux Kernel ...

web:access.redhat.com

The mitigation methods below address both vulnerabilities that affect Red Hat products — CVE - 2026 -43284 (IPsec ESP) and CVE - 2026 -46300 (XFRM ESP-in-TCP). CVE - 2026 -43500 (rxrpc) does not affect Red Hat products and requires no mitigation .

2026-05-23 20:55 UTC
Log4j Vulnerability: What It Is and How to Fix It | Built In

web:builtin.com

Log4j Vulnerability Explained: What It Is and How to Fix It The Log4j vulnerability is a software vulnerability in Log4j — an open-source library commonly used in Java-based systems and applications. Here's how the vulnerability works, the response to and impact of the vulnerability and tips to mitigate it.

2026-05-23 20:55 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 20:55 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.

2026-05-23 20:55 UTC
Nvd - Cve-2026-0484

web:nvd.nist.gov

An official website of the United States government Here's how you know

2026-05-23 20:55 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 20:55 UTC
CVE-2026-43500 and CVE-2026-43284 analysis

web:socprime.com

Explore Detections CVE - 2026 -43500 and CVE - 2026 -43284 Mitigation Practical CVE - 2026 -43500 mitigation starts with reducing available attack paths before a vendor patch is fully available across environments.

2026-05-23 20:55 UTC
Apache Log4j Vulnerability Guidance - CISA

web:www.cisa.gov

As stated above, Emergency Directive (ED) 22-02: Mitigate Apache Log4j Vulnerability requires agencies to patch vulnerable internet-facing assets immediately. Conduct a security review to determine if there is a security concern or compromise.

2026-05-23 20:55 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 20:55 UTC
Windows 11 April 2026 Update tested: What's new, improved and fixed

web:www.windowslatest.com

Windows 11 April 2026 update adds Narrator Copilot support, faster Settings, File Explorer fixes, and key security improvements.

2026-05-23 20:55 UTC
How to mitigate the "Dirty Frag" CVE-2026-43284 and CVE-2026-43500 in ...

web:access.redhat.com

OpenShift Container Platform 4 products are confirmed to be affected by Local Privilege Escalation "Dirty Frag" CVE - 2026 -43284, referenced by RHSB- 2026 -003. How to mitigate this vulnerability in OpenShift until a fix is implemented? Is "Copy Fail 2" the same vulnerability than "Dirty Frag"?

2026-05-26 02:55 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 ...

2026-05-26 02:55 UTC
[Security Advisory] CVE-2026-43284, CVE-2026-43500: "DirtyFrag" Linux ...

web:nebius.com

DirtyFrag ( CVE - 2026 -43284 and CVE - 2026 -43500) is a pair of Linux kernel vulnerabilities that can allow local privilege escalation on affected systems. In this advisory, we explain which Nebius services may be impacted, what mitigations are currently recommended and how to secure compute instances and Managed Kubernetes environments.

2026-05-26 02:55 UTC
Dirty Frag (CVE-2026-43284, CVE-2026-43500): KernelCare Live Patches ...

web:tuxcare.com

Dirty Frag is a Linux kernel local privilege escalation in IPsec ESP and rxrpc. KernelCare live patches are available now, no reboot required.

2026-05-26 02:55 UTC
Dirty Frag Linux kernel local privilege escalation vulnerability ...

web:ubuntu.com

The vulnerability fix will be distributed through the Linux kernel image packages. A mitigation which disables the affected modules can be applied according to the instructions below.

2026-05-26 02:55 UTC
"DirtyFrag" (CVE-2026-43500, CVE-2026-43284) Mitigations - Linode

web:www.linode.com

The " DirtyFrag " ( CVE - 2026 -43500, CVE - 2026 -43284) vulnerabilities are the second in a new series of local privilege escalations in the Linux kernel that have recently been published and which exploit the ability for an unprivileged user to write to the page cache. Similar to the " CopyFail " ( CVE - 2026 -31431) vulnerability in nature, these new attack vectors exploit the esp4/esp6 (used ...

2026-05-26 02:55 UTC
Unveiling the GitHub Vulnerability: A Deep Dive into CVE-2026-3854 and ...

web:www.thetechedvocate.org

Spread the loveIntroduction In recent weeks, the cybersecurity community was rocked by the revelation of a critical vulnerability in GitHub's infrastructure, identified as CVE - 2026 -3854. This flaw, discovered by researchers at Wiz, has raised alarms over the security of millions of repositories hosted on GitHub.com and GitHub Enterprise Server. With the potential for remote code execution ...

2026-05-26 02:55 UTC
Dirty Frag (CVE-2026-43284) Linux Privilege Escalation | Wiz Blog

web:www.wiz.io

Dirty Frag: Linux Kernel Local Privilege Escalation via ESP and RxRPC Unpatched kernel flaw chain ( CVE - 2026 -43284, CVE - 2026 -43500) enables root escalation on major Linux distributions.

2026-05-26 02:55 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-43484.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/mmc/host.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "41dce4dae583a8ce06a7ebf4ce704c46a142957c",
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              "versionType": "git"
            },
            {
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            },
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              "versionType": "git"
            },
            {
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            {
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            }
          ]
        },
        {
          "defaultStatus": "affected",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.15"
            },
            {
              "lessThan": "4.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.167",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.78",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.19",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
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                },
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                  "versionEndExcluding": "6.18.19",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.9",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: core: Avoid bitfield RMW for claim/retune flags\n\nMove claimed and retune control flags out of the bitfield word to\navoid unrelated RMW side effects in asynchronous contexts.\n\nThe host->claimed bit shared a word with retune flags. Writes to claimed\nin __mmc_claim_host() or retune_now in mmc_mq_queue_rq() can overwrite\nother bits when concurrent updates happen in other contexts, triggering\nspurious WARN_ON(!host->claimed). Convert claimed, can_retune,\nretune_now and retune_paused to bool to remove shared-word coupling."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-13T15:08:30.919Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/41dce4dae583a8ce06a7ebf4ce704c46a142957c"
        },
        {
          "url": "https://git.kernel.org/stable/c/bb7fc2498c3bb25fa6a91f22f4760005325cfbd5"
        },
        {
          "url": "https://git.kernel.org/stable/c/270277c2ab631044867adb1bd2f2433d3892de6e"
        },
        {
          "url": "https://git.kernel.org/stable/c/45038e03f15e992c48603fff8c6b1c9be5397ac9"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e06cc511c61cff1591e5435a207759adcc76b6d"
        },
        {
          "url": "https://git.kernel.org/stable/c/d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc"
        },
        {
          "url": "https://git.kernel.org/stable/c/901084c51a0a8fb42a3f37d2e9c62083c495f824"
        }
      ],
      "title": "mmc: core: Avoid bitfield RMW for claim/retune flags",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43484",
    "datePublished": "2026-05-13T15:08:30.919Z",
    "dateReserved": "2026-05-01T14:12:56.012Z",
    "dateUpdated": "2026-05-13T15:08:30.919Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}