CVE-2026-43500

Description

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present The DATA-packet handler in rxrpc_input_call_event() and the RESPONSE handler in rxrpc_verify_response() copy the skb to a linear one before calling into the security ops only when skb_cloned() is true. An skb that is not cloned but still carries externally-owned paged fragments (e.g. SKBFL_SHARED_FRAG set by splice() into a UDP socket via __ip_append_data, or a chained skb_has_frag_list()) falls through to the in-place decryption path, which binds the frag pages directly into the AEAD/skcipher SGL via skb_to_sgvec(). Extend the gate to also unshare when skb_has_frag_list() or skb_has_shared_frag() is true. This catches the splice-loopback vector and other externally-shared frag sources while preserving the zero-copy fast path for skbs whose frags are kernel-private (e.g. NIC page_pool RX, GRO). The OOM/trace handling already in place is reused.

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: 7.8 / 10 HIGH MS rating: Important
CWE(s): —
Reserved: 2026-05-01
Published: 2026-05-11 08:26 UTC
Last updated: 2026-05-17 17:21 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/43xxx/CVE-2026-43500.json
Linked Threat: CVE-2026-43500 — CVE-2026-43500

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: 2026-05-11 08:16:16 UTC
NVD last modified: 2026-05-17 16:16:16 UTC
NVD CVSS v3.1: 7.8 / 10 HIGH source: nvd@nist.gov
NVD CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability subscore: 1.8 / 10
Impact subscore: 5.9 / 10
EPSS score: 0.0126 (probability of exploitation in next 30 days)
EPSS percentile: 79.67% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

NVD-assigned CWE(s): CWE-787 (differs from the CNA list above)

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-2026-29037
Assigner: Linux
Published: May 11, 2026, 6:26:45 AM
Updated: May 20, 2026, 4:08:12 PM
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: 40.2700
Vendors: Linux
Products: Linux (d0d5c0cd1e711c98703f3544c1e6fc1372898de5 <aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71)

Linux (5.3)

Linux (d0d5c0cd1e711c98703f3544c1e6fc1372898de5 <d45179f8795222ce858770dc619abe51f9d24411)

Linux (d0d5c0cd1e711c98703f3544c1e6fc1372898de5 <3eae0f4f9f7206a4801efa5e0235c25bbd5a412c)

Linux (patch: 6.6.140)

Linux (patch: 6.12.88)

Linux (patch: 7.1-rc3)

Linux (d0d5c0cd1e711c98703f3544c1e6fc1372898de5 <7c504ffab3efce8f7e4f463b314ae31030bdf18b)

Linux (patch: 6.18.29)

Linux (d0d5c0cd1e711c98703f3544c1e6fc1372898de5 <3711382a77342a9a1c3d2e7330dcfc7ea927f568)

Linux (patch: 7.0.6)

Linux (patch: 0)

ENISA description: In the Linux kernel, the following vulnerability has been resolved: rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present The DATA-packet handler in rxrpc_input_call_event() and the RESPONSE handler in rxrpc_verify_response() copy the skb to a linear one before calling into the security ops only when skb_cloned() is true. An skb that is not cloned but still carries externally-owned paged fragments (e.g. SKBFL_SHARED_FRAG set by splice() into a UDP socket via __ip_append_data, or a chained skb_has_frag_list()) falls through to the in-place decryption path, which binds the frag pages directly into the AEAD/skcipher SGL via skb_to_sgvec(). Extend the gate to also unshare when skb_has_frag_list() or skb_has_shared_frag() is true. This catches the splice-loopback vector and other externally-shared frag sources while preserving the zero-copy fast path for skbs whose frags are kernel-private (e.g. NIC page_pool RX, GRO). The OOM/trace handling already in place is reused.

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: Important
MS CVSS base score: 7.8 / 10 (temporal 7.1)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U
Release: 2026-May

Affected products (2)

Vendor	Product	Versions	Platforms
Linux	Linux	`d0d5c0cd1e711c98703f3544c1e6fc1372898de5` (affected), `d0d5c0cd1e711c98703f3544c1e6fc1372898de5` (affected), `d0d5c0cd1e711c98703f3544c1e6fc1372898de5` (affected), `d0d5c0cd1e711c98703f3544c1e6fc1372898de5` (affected), `d0d5c0cd1e711c98703f3544c1e6fc1372898de5` (affected)	—
Linux	Linux	`5.3` (affected), `0` (unaffected), `6.6.140` (unaffected), `6.12.88` (unaffected), `6.18.29` (unaffected), `7.0.6` (unaffected), `7.1-rc3` (unaffected)	—

Affected products — CPE 2.3 (6) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.3:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.3:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.3:rc8:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*

Vendor references (5)

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

MITRE references (5) cveawg.mitre.org

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

Web references (19)

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-2026-43500 msrc
https://attackerkb.com/topics/CVE-2026-43500 rapid7:attackerkb.com
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-29037 rapid7:euvd.enisa.europa.eu
http://cwe.mitre.org/data/definitions/787.html rapid7:cwe.mitre.org
https://www.infosecurity-magazine.com/news/fragnesia-linux-kernel-lpe-root/ tenable:www.infosecurity-magazine.com
https://almalinux.org/blog/2026-05-07-dirty-frag/ tenable:almalinux.org
https://arstechnica.com/security/2026/05/linux-bitten-by-second-severe-vulnerability-in-as-many-weeks/ tenable:arstechnica.com
https://aws.amazon.com/security/security-bulletins/rss/2026-030-aws/ tenable:aws.amazon.com
https://www.bleepingcomputer.com/news/security/new-linux-dirty-frag-zero-day-with-poc-exploit-gives-root-privileges/ tenable:www.bleepingcomputer.com
https://www.cve.org/CVERecord?id=CVE-2026-43500 tenable:www.cve.org
https://www.darkreading.com/vulnerabilities-threats/dirty-frag-exploit-blow-up-enterprise-linux-distros tenable:www.darkreading.com
https://www.first.org/epss/ tenable:www.first.org
https://www.infosecurity-magazine.com/news/dirty-frag-linux-kernel/ tenable:www.infosecurity-magazine.com
https://github.com/V4bel/dirtyfrag tenable:github.com
https://kb.cert.org/vuls/id/980487 tenable:kb.cert.org
https://nvd.nist.gov/vuln/detail/CVE-2026-43500 tenable:nvd.nist.gov
https://securityaffairs.com/192436/uncategorized/dirtydecrypt-poc-released-for-yet-another-linux-flaw.html tenable:securityaffairs.com
https://therecord.media/dirty-frag-linux-kernel-hit-by-second-major-bug tenable:therecord.media
https://www.bleepingcomputer.com/news/security/new-fragnesia-linux-flaw-lets-attackers-gain-root-privileges/ tenable:www.bleepingcomputer.com

NVD-tagged references (6)

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/3eae0f4f9f7206a4801efa5e0235c25bbd5a412c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/d45179f8795222ce858770dc619abe51f9d24411 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/3711382a77342a9a1c3d2e7330dcfc7ea927f568 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/7c504ffab3efce8f7e4f463b314ae31030bdf18b 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://github.com/V4bel/dirtyfrag 134c704f-9b21-4f2e-91b3-4a467353bcc0

Remediations (16)

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 21:02 UTC
HIGH Vulnerability CVE-2026-43500 — CVSS 7.8 | Security Advisory

web:atlas-cybersecurity.com

A HIGH-severity vulnerability identified as CVE-2026-43500 has been published on May 11, 2026 with a CVSS base score of 7.8. The vulnerability affects Linux Linux kernel. This security advisory provides a detailed breakdown of the vulnerability, its potential impact, weakness classification, and actionable steps to protect your systems.

2026-05-23 21:02 UTC
Security Update Guide - Microsoft Security Response Center

web:msrc.microsoft.com

Security Update Guide - Microsoft Security Response Center

2026-05-23 21:02 UTC
Nvd - Cve-2025-43500

web:nvd.nist.gov

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

2026-05-23 21:02 UTC
Dirty Frag (CVE-2026-43284, CVE-2026-43500): Frequently asked questions ...

web:securityboulevard.com

The post Dirty Frag ( CVE - 2026 -43284, CVE-2026-43500 ): Frequently asked questions about this Linux kernel privilege escalation vulnerability chain appeared first on Tenable Blog. Weeks after the Copy Fail vulnerability was revealed, a new Linux kernel escalation vulnerability has been uncovered.

2026-05-23 21:02 UTC
CVE-2026-43500 and CVE-2026-43284 analysis - socprime.com

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 21:02 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 ...

2026-05-23 21:02 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.

2026-05-23 21:02 UTC
Dirty Frag (CVE-2026-43284,CVE-2026-43500): Linux Kernel ... - Tenable

web:www.tenable.com

Dirty Frag ( CVE - 2026 -43284, CVE-2026-43500 ) is a Linux kernel local privilege escalation exploit chain with a public PoC affecting major Linux distributions.

2026-05-23 21:02 UTC
Patch Tuesday May 2026: Security Updates & CVE Analysis

web:zecurit.com

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

2026-05-23 21:02 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 02:47 UTC
Oracle Critical Patch Update, April 2026 Security Update Review

web:blog.qualys.com

Oracle released its second quarterly edition of this year's Critical Patch Update. The update received patches for 481 security vulnerabilities.

2026-05-26 02:47 UTC
CVE-2026-43500 - linux.oracle.com

web:linux.oracle.com

CVE Details ... Description This is a placeholder description for the 2nd DirtyFrag vulnerability See more information about CVE-2026-43500 from MITRE CVE dictionary and NIST NVD NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

2026-05-26 02:47 UTC
March 13, 2026—Hotpatch KB5084597 (OS Builds 26200.7982 and 26100.7982 ...

web:support.microsoft.com

This update for Windows 11, version 25H2 and 24H2 (KB5084597) incudes security improvements. To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained. For information on Windows update terminology, see the different types of Windows software updates. To view the ...

2026-05-26 02:47 UTC
Dirty Frag LPE: CVE-2026-43284 and CVE-2026-43500 Deep Dive

web:www.picussecurity.com

Dirty Frag chains CVE - 2026 -43284 and CVE-2026-43500 for Linux root privilege escalation. Learn how it works, how to remediate, and how to simulate it.

2026-05-26 02:47 UTC
Dirty Frag (CVE-2026-43284 and CVE-2026-43500): Detecting unpatched ...

web:www.sysdig.com

Dirty Frag ( CVE - 2026 -43284, CVE-2026-43500 ) exposes a critical Linux kernel flaw enabling local privilege escalation to root. Learn how it works, affected systems, detection with Sysdig and Falco, and mitigation strategies.

2026-05-26 02:47 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-43500.json.

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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43500",
    "datePublished": "2026-05-11T06:26:45.838Z",
    "dateReserved": "2026-05-01T14:12:56.014Z",
    "dateUpdated": "2026-05-17T15:21:39.755Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}