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5.5
MEDIUM CVSS 3.1
CVE-2026-64288
KVM: arm64: nv: Avoid dereferencing NULL VNCR pseudo-TLB
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: nv: Avoid dereferencing NULL VNCR pseudo-TLB VNCR TLB invalidation occurs from MMU notifiers or TLBI instructions, and either can race against a vcpu not being onlined yet (no pseudo-TLB allocated). Similarly, the TLB might be invalid, and the invalidation should be skipped in this case. Both kvm_invalidate_vncr_ipa() and kvm_invalidate_vncr_va() are expected to perform the same checks, except that the latter doesn't check for the allocation and blindly dereferences the pointer. Solve this by introducing a new iterator built on top of the usual kvm_for_each_vcpu() that checks for both of the above conditions, and convert the two users to it.

Details
INFO

Published Date :

July 25, 2026, 10:17 a.m.

Last Modified :

Aug. 17, 2026, 5:17 a.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-64288 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM [email protected]
Solution
Update the Linux kernel to resolve race conditions in KVM's ARM64 VNCR handling.
  • Apply the latest Linux kernel updates.
  • Ensure KVM module is configured correctly.
  • Review kernel logs for related errors.
  • Test system stability after update.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-64288.

URL Resource
https://git.kernel.org/stable/c/4be6cbeb93d26994bd1827ddbce391e3c4395c8f Patch
https://git.kernel.org/stable/c/5fd30133af864a1de0a0bd87d3fe3cf23205fbc7 Patch
https://git.kernel.org/stable/c/7c73a269a880b1399baacfb9d521415e6ef7ecc2 Patch
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-64288 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-64288 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-64288 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-64288 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 17, 2026

    Action Type Old Value New Value
    Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929', 'lessThan': '7c73a269a880b1399baacfb9d521415e6ef7ecc2', 'versionType': 'git'}, {'status': 'affected', 'version': '4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929', 'lessThan': '5fd30133af864a1de0a0bd87d3fe3cf23205fbc7', 'versionType': 'git'}, {'status': 'affected', 'version': '4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929', 'lessThan': '4be6cbeb93d26994bd1827ddbce391e3c4395c8f', 'versionType': 'git'}], 'programFiles': ['arch/arm64/kvm/nested.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.16'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['arch/arm64/kvm/nested.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929', 'lessThan': '7c73a269a880b1399baacfb9d521415e6ef7ecc2', 'versionType': 'git'}, {'status': 'affected', 'version': '4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929', 'lessThan': '5fd30133af864a1de0a0bd87d3fe3cf23205fbc7', 'versionType': 'git'}, {'status': 'affected', 'version': '4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929', 'lessThan': '4be6cbeb93d26994bd1827ddbce391e3c4395c8f', 'versionType': 'git'}], 'programFiles': ['arch/arm64/kvm/nested.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.16'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['arch/arm64/kvm/nested.c'], 'defaultStatus': 'affected'}]
  • Initial Analysis by [email protected]

    Aug. 13, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
    Added CWE CWE-476
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.1.4 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.16 up to (excluding) 6.18.39
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/4be6cbeb93d26994bd1827ddbce391e3c4395c8f Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/5fd30133af864a1de0a0bd87d3fe3cf23205fbc7 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/7c73a269a880b1399baacfb9d521415e6ef7ecc2 Types: Patch
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jul. 25, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929', 'lessThan': '7c73a269a880b1399baacfb9d521415e6ef7ecc2', 'versionType': 'git'}, {'status': 'affected', 'version': '4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929', 'lessThan': '5fd30133af864a1de0a0bd87d3fe3cf23205fbc7', 'versionType': 'git'}, {'status': 'affected', 'version': '4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929', 'lessThan': '4be6cbeb93d26994bd1827ddbce391e3c4395c8f', 'versionType': 'git'}], 'programFiles': ['arch/arm64/kvm/nested.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.16'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['arch/arm64/kvm/nested.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: nv: Avoid dereferencing NULL VNCR pseudo-TLB VNCR TLB invalidation occurs from MMU notifiers or TLBI instructions, and either can race against a vcpu not being onlined yet (no pseudo-TLB allocated). Similarly, the TLB might be invalid, and the invalidation should be skipped in this case. Both kvm_invalidate_vncr_ipa() and kvm_invalidate_vncr_va() are expected to perform the same checks, except that the latter doesn't check for the allocation and blindly dereferences the pointer. Solve this by introducing a new iterator built on top of the usual kvm_for_each_vcpu() that checks for both of the above conditions, and convert the two users to it.
    Added Reference https://git.kernel.org/stable/c/4be6cbeb93d26994bd1827ddbce391e3c4395c8f
    Added Reference https://git.kernel.org/stable/c/5fd30133af864a1de0a0bd87d3fe3cf23205fbc7
    Added Reference https://git.kernel.org/stable/c/7c73a269a880b1399baacfb9d521415e6ef7ecc2
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 5.5
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact