CVE-2026-46147: KVM: arm64: Fix pin leak and publication ordering in __pkvm_init_vcpu()
CVE-2026-46147 is a vulnerability in KVM: arm64: Fix pin leak and publication ordering in __pkvm_init_vcpu(), rated Moderate by Microsoft, with a CVSS 3.1 base score of 5.5 (Medium). An attacker can exploit it by an attacker with local access, with low privileges and without user interaction. Microsoft has not reported exploitation in the wild. The EPSS model estimates a 0.13% probability of exploitation activity in the next 30 days, higher than 2% of all scored vulnerabilities. Microsoft released the fix on 28 May 2026, outside Patch Tuesday. It affects 8 products in 1 product family (Open Source Software).
Key facts
- CVE ID
- CVE-2026-46147
- Severity
- Medium CVSS 5.5
- Microsoft severity
- Moderate
- Exploited in the wild
- No
- Publicly disclosed
- No
- Weakness
- CWE-401
- EPSS
- 0.13% (percentile 2%)
- CISA KEV
- Not listed
- Released
- Last updated
- Patch Tuesday
- May 2026 Patch Tuesday
- Product families
- Open Source Software
CVSS score and vector
Microsoft scores CVE-2026-46147 at 5.5 (temporal 5.1) using CVSS 3.1. Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U
| Metric | Value |
|---|---|
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality impact | High |
| Integrity impact | None |
| Availability impact | None |
| Exploit code maturity | Unproven |
NVD scores it 5.5 (MEDIUM) with CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products (8)
Open Source Software
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| azl3 kernel 6.6.145.2-1 on Azure Linux 3.0 | ||||
| azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 | ||||
| azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 | Release Notes | Security Update | ||
| azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 | Release Notes | Security Update | ||
| azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 | ||||
| azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 | ||||
| azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 | ||||
| azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 |
NIST NVD data
- NVD status
- Analyzed
- NVD CVSS
- 5.5 (MEDIUM)
- NVD weakness
- CWE-401
- Published to NVD
- NVD last modified
Affected configurations (CPE)
| Product | Vulnerable versions |
|---|---|
| linux kernel | before 6.18.30 |
| linux kernel | from 6.19, before 7.0.7 |
| linux kernel 7.1 | all listed versions |
References
Revision history
| Version | Date | Description |
|---|---|---|
| 1.0 | Information published. | |
| 2.0 | Information published. | |
| 3.0 | Information published. | |
| 4.0 | Information published. | |
| 5.0 | Information published. | |
| 6.0 | Information published. | |
| 7.0 | Information published. | |
| 8.0 | Information published. | |
| 9.0 | Information published. | |
| 10.0 | Information published. |