CVE-2026-43500: In the Linux kernel, the following vulnerability has been resolved: rxrpc: Also unshare DATA/RESPONSE packets

Q: How do I fix CVE-2026-43500?

linux kernel: upgrade to 6.18.29, 7.0.6. Exact commands for each OS are on this page.

Q: Is CVE-2026-43500 being exploited?

CVE-2026-43500 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-43500 affect?

CVE-2026-43500 affects linux kernel. Severity is high (CVSS 7.8). 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_respon

Q: How urgent is CVE-2026-43500?

Priority 62/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference; On your watchlist

This week

HIGH 7.8WATCHLISTUPGRADE

CVE-2026-43500 is a high-severity flaw (CVSS 7.8) affecting linux kernel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 b

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	94.1% (top 1%)
CISA exploited list	No
Weakness	CWE-787, CWE-123
Published	2026-05-11
Last modified	2026-08-24

Publisher (CNA): kernel.org · Vendor: linux

Last updated 2026-08-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-11 08:16 UTCPublished CVE record published
2026-08-24 13:18 UTCUpdated Record last modified

linux linux kernel UPGRADE

Affected: > 5.3 and < 6.18.29 · >= 6.19 and < 7.0.6 · 5.3 · 5.3 rc7 · 5.3 rc8 · 7.1 rc1 · 7.1 rc2

Fixed in: 6.18.29, 7.0.6

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

Fedora 46 · proftpd · FIXED · 1.3.9e-1.fc46 · FEDORA-2026-fc0d87d66e · source

sudo dnf upgrade --advisory=FEDORA-2026-fc0d87d66e

Ubuntu 20.04 · linux · FIXED · 5.4.0-231.251

sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "5.4.0-231.251" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 22.04 · linux · FIXED · 5.15.0-181.191

sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "5.15.0-181.191" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 24.04 · linux · FIXED · 6.8.0-124.124

sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.8.0-124.124" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 25.10 · linux · FIXED · 6.17.0-35.35

sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.17.0-35.35" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 20.04 · linux-hwe-5.15 · FIXED · 5.15.0-181.191~20.04.1

sudo apt update && sudo apt install --only-upgrade linux-hwe-5.15 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux-hwe-5.15)" ge "5.15.0-181.191~20.04.1" && echo PATCHED || echo STILL-VULNERABLE

Debian 12 · linux · FIXED · 6.1.170-3

sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.1.170-3" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · linux · FIXED · 6.12.86-1

sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.12.86-1" && echo PATCHED || echo STILL-VULNERABLE

RHEL 10 · kernel · NOT AFFECTED

RHEL 10 · libkrun · NOT AFFECTED

RHEL 6 · kernel · NOT AFFECTED

RHEL 7 · kernel · NOT AFFECTED

RHEL 7 · kernel-rt · NOT AFFECTED

Amazon Linux 2 · see advisory · FIXED · ALAS2-2026-3302 · source

sudo yum update --advisory=ALAS2-2026-3302

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: attaattaatta/CVE-2026-43500 (0 stars)
GitHub PoC: vorkampfer/dirty_frag_mitigation (0 stars)
Write-up: github.com/V4bel/dirtyfrag
Exploit-DB: Linux Kernel - Local Privilege Escalation
Exploit-DB: Linux Kernel - Local Privilege Escalation
Metasploit: rxkad Page-Cache Write via CVE-2026-43500

Advisories and coverage

Research and news

Wiz Research: Dirty Frag: Linux Kernel Local Privilege Escalation via ESP and RxRPC 2026-05-08
Sysdig Threat Research: Dirty Frag (CVE-2026-43284 and CVE-2026-43500): Detecting unpatched local privilege escalation via Linux Kernel ESP and RxRPC 2026-05-08

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-43500?

linux kernel: upgrade to 6.18.29, 7.0.6. Exact commands for each OS are on this page.

Is CVE-2026-43500 being exploited?

CVE-2026-43500 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-43500 affect?

CVE-2026-43500 affects linux kernel. Severity is high (CVSS 7.8). 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_respon

How urgent is CVE-2026-43500?

Priority 62/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference; On your watchlist

Software pages

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References

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