CVE-2026-43284: In the Linux kernel, the following vulnerability has been resolved: xfrm: esp: avoid in-place decrypt on shar

Q: How do I fix CVE-2026-43284?

linux kernel: upgrade to 5.10.255, 5.15.205, 6.1.171, 6.6.138, 6.12.87, 6.18.28, 7.0.5. Exact commands for each OS are on this page.

Q: Is CVE-2026-43284 being exploited?

CVE-2026-43284 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-2026-43284 affect?

CVE-2026-43284 affects linux kernel. Severity is high (CVSS 8.8). In the Linux kernel, the following vulnerability has been resolved: xfrm: esp: avoid in-place decrypt on shared skb frags MSG_SPLICE_PAGES can attach pages from a pipe directly to an skb. TCP marks such skbs with SKBFL_SHARED_FRAG after s

Q: How urgent is CVE-2026-43284?

Priority 69/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Covered by 3 security sources; On your watchlist

This week

HIGH 8.8WATCHLISTUPGRADE

CVE-2026-43284 is a high-severity flaw (CVSS 8.8) 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: xfrm: esp: avoid in-place decrypt on shared skb frags MSG_SPLICE_PAGES can attach pages from a pipe directly to an skb. TCP marks such skbs with SKBFL_SHARED_FRAG after skb_splice_from_iter(), so later paths that may modify packet data can first make a private copy. The IPv4/IPv6 datagram append paths did not set this flag when splicing pages into UDP skbs. That leaves an ESP-

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Public exploit reference
Covered by 3 security sources
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	94.2% (top 1%)
CISA exploited list	No
Weakness	CWE-123
Published	2026-05-08
Last modified	2026-09-08

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

Last updated 2026-09-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-08 08:16 UTCPublished CVE record published
2026-09-08 09:18 UTCUpdated Record last modified

linux linux kernel UPGRADE

Affected: >= 4.11 and < 5.10.255 · >= 5.12 and < 5.15.205 · >= 5.16 and < 6.1.171 · >= 6.2 and < 6.6.138 · >= 6.7 and < 6.12.87 · >= 6.13 and < 6.18.28 · >= 7.0 and < 7.0.5

Fixed in: 5.10.255, 5.15.205, 6.1.171, 6.6.138, 6.12.87, 6.18.28, 7.0.5

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 · fzssh · FIXED · 1.4.0-2.fc46 · FEDORA-2026-8004fcd067 · source

sudo dnf upgrade --advisory=FEDORA-2026-8004fcd067

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 · FIXED · kernel-6.12.0-124.56.1.el10_1

sudo dnf upgrade --advisory=RHSA-2026:16062 rpm -q kernel

RHEL 10.0 Extended Update Support · kernel · FIXED · kernel-6.12.0-55.73.1.el10_0

sudo dnf upgrade --advisory=RHSA-2026:16314 rpm -q kernel

RHEL 8 · kernel-rt · FIXED · kernel-rt-4.18.0-553.124.1.rt7.465.el8_10

sudo dnf upgrade --advisory=RHSA-2026:16196 rpm -q kernel-rt

RHEL 8 · kernel · FIXED · kernel-4.18.0-553.124.1.el8_10

sudo dnf upgrade --advisory=RHSA-2026:16195 rpm -q kernel

RHEL 8.4 Advanced Mission Critical Update Support · kernel · FIXED · kernel-4.18.0-305.191.1.el8_4

sudo dnf upgrade --advisory=RHSA-2026:16201 rpm -q kernel

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-1695 · source

sudo dnf update --advisory=ALAS2023-2026-1695

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: ankitrawatgit/DirtyFrag-Android-Root-Jailbreak (54 stars)
GitHub PoC: linnemanlabs/dirtyfrag-arm64 (38 stars)
GitHub PoC: 0xBlackash/CVE-2026-43284 (24 stars)
Write-up: cert-portal.siemens.com/productcert/html/ssa-019113.html
Write-up: cert-portal.siemens.com/productcert/html/ssa-082556.html
Exploit-DB: Linux Kernel - Local Privilege Escalation
Exploit-DB: Linux Kernel - Local Privilege Escalation
Metasploit: xfrm-ESP Page-Cache Write via CVE-2026-43284

Advisories and coverage

Official advisories

AlmaLinux Errata: [ALSA-2026:19225] Important: kernel security update 2026-05-26

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-2026-43284?

linux kernel: upgrade to 5.10.255, 5.15.205, 6.1.171, 6.6.138, 6.12.87, 6.18.28, 7.0.5. Exact commands for each OS are on this page.

Is CVE-2026-43284 being exploited?

CVE-2026-43284 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-2026-43284 affect?

CVE-2026-43284 affects linux kernel. Severity is high (CVSS 8.8). In the Linux kernel, the following vulnerability has been resolved: xfrm: esp: avoid in-place decrypt on shared skb frags MSG_SPLICE_PAGES can attach pages from a pipe directly to an skb. TCP marks such skbs with SKBFL_SHARED_FRAG after s

How urgent is CVE-2026-43284?

Priority 69/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Covered by 3 security sources; On your watchlist

Software pages

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References

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