CVE-2026-53277

Host compromise via unlocked KVM page-table walks

Published Jun 25, 2026 · Updated Jun 25, 2026

Improper synchronization in KVM arm64 in Linux Kernel allows local users to compromise host confidentiality, integrity, and availability. The __kvm_at_s12() and __kvm_find_s1_desc_level() paths call walk_s1() and kvm_walk_nested_s2() without holding kvm->srcu while concurrent memslot changes can invalidate the page-table walk. Reachability requires local low-privileged access to an arm64 KVM host and the affected address-translation emulation or fault-injection paths, with no user interaction.

CVSS severity8.8
High
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper synchronization in KVM arm64 in Linux Kernel allows local users to compromise host confidentiality, integrity, and availability. The __kvm_at_s12() and __kvm_find_s1_desc_level() paths call walk_s1() and kvm_walk_nested_s2() without holding kvm->srcu while concurrent memslot changes can invalidate the page-table walk. Reachability requires local low-privileged access to an arm64 KVM host and the affected address-translation emulation or fault-injection paths, with no user interaction.

The record

CVE
CVE-2026-53277
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-820, CWE-662, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.12
  2. Affected versionversion=be04cebf3e78874627dc1042991d5d504464a5cc <97706097f9b851cfe55c3b00b083dfc2bcf542bc
  3. Affected versionversion=be04cebf3e78874627dc1042991d5d504464a5cc <ec42b4ed1b072ea2d03f086061aa67bad6d8de39
  4. Affected versionversion=be04cebf3e78874627dc1042991d5d504464a5cc <f2ca45b50d4216c9cc7ffabf50d9ad1932209251

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.12; version=be04cebf3e78874627dc1042991d5d504464a5cc <97706097f9b851cfe55c3b00b083dfc2bcf542bc; version=be04cebf3e78874627dc1042991d5d504464a5cc <ec42b4ed1b072ea2d03f086061aa67bad6d8de39; version=be04cebf3e78874627dc1042991d5d504464a5cc <f2ca45b50d4216c9cc7ffabf50d9ad1932209251

Published CVSS scores

7.0Red Hat SADPCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-820Missing Synchronization
CWE-662Improper Synchronization
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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