CVE-2026-46316

Guest-to-host memory corruption via duplicate reference release

Published Jun 9, 2026 · Updated Jun 9, 2026

Use-after-free in Linux Kernel KVM arm64 VGIC ITS 6.10 allows guest OS users to corrupt host-kernel memory through cache invalidation. vgic_its_invalidate_cache() releases the pointer visited by xa_for_each() instead of only the entry returned by atomic xa_erase(), allowing concurrent drains to decrement one cache reference repeatedly. Exploitation requires overlapping invalidation paths to observe the same entry; premature release leaves an ITE mapped to freed host-kernel memory.

CVSS severity9.3
Critical
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux Kernel KVM arm64 VGIC ITS 6.10 allows guest OS users to corrupt host-kernel memory through cache invalidation. vgic_its_invalidate_cache() releases the pointer visited by xa_for_each() instead of only the entry returned by atomic xa_erase(), allowing concurrent drains to decrement one cache reference repeatedly. Exploitation requires overlapping invalidation paths to observe the same entry; premature release leaves an ITE mapped to freed host-kernel memory.

The record

CVE
CVE-2026-46316
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-911, T1068
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 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=6.10
  2. Affected versionversion=8201d1028caa4fae88e222c4e8cf541fdf45b821 <13031fb6b8357fbbcded2a7f4cba73e4781ee594
  3. Affected versionversion=8201d1028caa4fae88e222c4e8cf541fdf45b821 <2bbc395e81bd29c543a0529a678327e932a7ec69
  4. Affected versionversion=8201d1028caa4fae88e222c4e8cf541fdf45b821 <9121f4605ab94969f62d1b5714ca3c6c69bd202f
  5. Affected versionversion=8201d1028caa4fae88e222c4e8cf541fdf45b821 <b7b72e88046328c9fdc638fe887d4240257dd5dc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.10; version=8201d1028caa4fae88e222c4e8cf541fdf45b821 <13031fb6b8357fbbcded2a7f4cba73e4781ee594; version=8201d1028caa4fae88e222c4e8cf541fdf45b821 <2bbc395e81bd29c543a0529a678327e932a7ec69; version=8201d1028caa4fae88e222c4e8cf541fdf45b821 <9121f4605ab94969f62d1b5714ca3c6c69bd202f; version=8201d1028caa4fae88e222c4e8cf541fdf45b821 <b7b72e88046328c9fdc638fe887d4240257dd5dc

Published CVSS scores

7.0Red Hat Security Data APICVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
9.3kernel.orgCVSS:3.1/AV:L/AC:L/PR:N/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-911Improper Update of Reference Count
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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