CVE-2026-53359: In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Fix shadow paging use-after-fre

Q: How do I fix CVE-2026-53359?

linux kernel: upgrade to 6.1.177, 6.6.144, 6.12.95, 6.18.38, 7.1.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-53359 being exploited?

CVE-2026-53359 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-2026-53359 affect?

CVE-2026-53359 affects linux kernel. Severity is high (CVSS 8.8). In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Fix shadow paging use-after-free due to unexpected role Commit 0cb2af2ea66ad ("KVM: x86: Fix shadow paging use-after-free due to unexpected GFN") fixed a shadow

Q: How urgent is CVE-2026-53359?

Priority 62/100. High severity; Public exploit reference; Covered by 3 security sources; On your watchlist

This week

HIGH 8.8WATCHLISTUPGRADE

CVE-2026-53359 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: KVM: x86: Fix shadow paging use-after-free due to unexpected role Commit 0cb2af2ea66ad ("KVM: x86: Fix shadow paging use-after-free due to unexpected GFN") fixed a shadow paging mismatch between stored and computed GFNs; the bug could be triggered by changing a PDE mapping from outside the guest, and then deleting a memslot. The rmap_remove() call would miss entries created af

Why this priority

High severity
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	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-416
Published	2026-07-04
Last modified	2026-10-03

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

Last updated 2026-10-03 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-04 12:17 UTCPublished CVE record published
2026-10-03 11:17 UTCUpdated Record last modified

linux linux kernel UPGRADE

Affected: >= 2.6.36 and < 6.1.177 · >= 6.2 and < 6.6.144 · >= 6.7 and < 6.12.95 · >= 6.13 and < 6.18.38 · >= 6.19 and < 7.1.3

Fixed in: 6.1.177, 6.6.144, 6.12.95, 6.18.38, 7.1.3

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 · rubygem-mechanize · FIXED · 2.14.2-1.fc46 · FEDORA-2026-d2e3b5fc5d · source

sudo dnf upgrade --advisory=FEDORA-2026-d2e3b5fc5d

Fedora ELN · opkssh · FIXED · 0.19.1-1.eln159 · FEDORA-2026-45a9706969 · source

sudo dnf upgrade --advisory=FEDORA-2026-45a9706969

Ubuntu 22.04 · linux · FIXED · 5.15.0-187.197

sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "5.15.0-187.197" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 24.04 · linux · FIXED · 6.8.0-137.137

sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.8.0-137.137" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 20.04 · linux · FIXED · 5.4.0-234.254

sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "5.4.0-234.254" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 20.04 · linux-hwe-5.15 · FIXED · 5.15.0-190.200~20.04.1

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 "5.15.0-190.200~20.04.1" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 22.04 · linux-hwe-6.8 · FIXED · 6.8.0-138.138~22.04.1

sudo apt update && sudo apt install --only-upgrade linux-hwe-6.8 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux-hwe-6.8)" ge "6.8.0-138.138~22.04.1" && echo PATCHED || echo STILL-VULNERABLE

Debian 12 · linux · FIXED · 6.1.177-1

sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.1.177-1" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · linux · FIXED · 6.12.95-1

sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.12.95-1" && echo PATCHED || echo STILL-VULNERABLE

RHEL 10 · kernel · FIXED · kernel-6.12.0-211.32.1.el10_2

sudo dnf upgrade --advisory=RHSA-2026:36956 rpm -q kernel

RHEL 10.0 Extended Update Support · kernel · FIXED · kernel-6.12.0-55.88.1.el10_0

sudo dnf upgrade --advisory=RHSA-2026:39371 rpm -q kernel

RHEL 8 · kernel-rt · FIXED · kernel-rt-4.18.0-553.143.1.rt7.484.el8_10

sudo dnf upgrade --advisory=RHSA-2026:39082 rpm -q kernel-rt

RHEL 8 · kernel · FIXED · kernel-4.18.0-553.143.1.el8_10

sudo dnf upgrade --advisory=RHSA-2026:39083 rpm -q kernel

RHEL 8.6 Advanced Mission Critical Update Support · kernel · FIXED · kernel-4.18.0-372.204.1.el8_6

sudo dnf upgrade --advisory=RHSA-2026:49033 rpm -q kernel

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-2001 · source

sudo dnf update --advisory=ALAS2023-2026-2001

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: Aoripus-LTD/Januscape-Hotfix (6 stars)
GitHub PoC: 0xBlackash/CVE-2026-53359 (4 stars)
GitHub PoC: chuzhongyun/CVE-2026-53359-Kernel-Fix (2 stars)
Write-up: github.com/V4bel/Januscape/blob/main/assets/write-up.md

Advisories and coverage

Official advisories

Google Cloud Security Bulletins: GCP-2026-046 2026-10-26
AlmaLinux Errata: [ALSA-2026:36957] Important: kernel security update 2026-07-10

Research and news

Trail of Bits: VMs won't contain cyber-capable agents 2026-08-26

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-2026-53359?

linux kernel: upgrade to 6.1.177, 6.6.144, 6.12.95, 6.18.38, 7.1.3. Exact commands for each OS are on this page.

Is CVE-2026-53359 being exploited?

CVE-2026-53359 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-2026-53359 affect?

CVE-2026-53359 affects linux kernel. Severity is high (CVSS 8.8). In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Fix shadow paging use-after-free due to unexpected role Commit 0cb2af2ea66ad ("KVM: x86: Fix shadow paging use-after-free due to unexpected GFN") fixed a shadow

How urgent is CVE-2026-53359?

Priority 62/100. High severity; Public exploit reference; Covered by 3 security sources; On your watchlist

Software pages

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References

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