CVE-2026-45782— Cloud Hypervisor: Use-after-free in virtio-block Async I/O Completion
Possible ATT&CK Techniques 1AI
T1211 · Exploitation for StealthAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| cloud-hypervisor | cloud-hypervisor | >= 21.0, < 51.2 | affected |
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I. Basic Information for CVE-2026-45782
Vulnerability Information
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Vulnerability Title
Cloud Hypervisor: Use-after-free in virtio-block Async I/O Completion
Source: CVE Program / CVE List V5
Vulnerability Description
Cloud Hypervisor is a Virtual Machine Monitor for Cloud workloads. From version 21.0 to before version 51.2, a guest can cause a use-after-free in the cloud-hypervisor process by submitting two virtio-block descriptor chains that reuse the same head_index while asynchronous block I/O is enabled (e.g. io_uring, aio). When the kernel completes the duplicate operation before the original, the completion path frees a bounce buffer that the kernel is still actively reading from or writing to, corrupting the freed memory. This issue has been patched in versions 51.2 and 52.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Cloud hypervisor 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cloud hypervisor是Cloud hypervisor公司的适用于现代云工作负载的虚拟机监视器。 Cloud hypervisor 21.0版本至51.2之前版本存在资源管理错误漏洞，该漏洞源于提交两个重用相同head_index的virtio-block描述符链，可能导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| cloud-hypervisor | cloud-hypervisor | >= 21.0, < 51.2 | - |
II. Public POCs for CVE-2026-45782
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-45782 (3)
Vendor Advisories for CVE-2026-45782 (1)
Vendor Pages for CVE-2026-45782 (1)
- 🔗 Release v52.0 · cloud-hypervisor/cloud-hypervisor · GitHubx_refsource_MISC
IV. Related Vulnerabilities
Same weakness: CWE-416
- CVE-2026-49306
time模块UAF漏洞，影响可用性 - CVE-2026-12366
Use-after-free freeing an armed dynamically-allocated k_time - CVE-2026-12365
Use-after-free in Zephyr delayable work-queue cancellation u - CVE-2026-11937
Security vulnerabilities have been found in IBM Verify Ident - CVE-2026-19548
Binutils: binutils: multiple use-after-free in add_archive_e
V. Comments for CVE-2026-45782
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