CVE-2026-45782 json
Cloud Hypervisor: Use-after-free in virtio-block Async I/O Completion
published 2026-06-09 5 mo ago modified 2026-07-23 3 mo ago also EUVD-2026-35870
- cvss
- 8.9
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 3%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- cloudhypervisor cloud_hypervisor 51.2
- cloud-hypervisor openSUSE Tumbleweed 52.0-1.1
opensuse advisories openSUSE-SU-2026:10907-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 4 mo ago
Exploit prediction
0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.9 | 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 |
| CNA | 4.0 | 8.9 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- cloud-hypervisor cloud-hypervisor
Classification
- Weakness
-
- CWE-416 Use After Free
References
- github.com /cloud-hypervisor/cloud-hypervisor/pull/8220
- github.com /cloud-hypervisor/cloud-hypervisor/commit/1314ac883c641f1045bbb06dec0de045a3894baa
- github.com /cloud-hypervisor/cloud-hypervisor/security/advisories/GHSA-f47p-p25q-83rh
- github.com /cloud-hypervisor/cloud-hypervisor/releases/tag/v51.2
- github.com /cloud-hypervisor/cloud-hypervisor/releases/tag/v52.0
Sources
- CVE List CVE-2026-45782
- NVD CVE-2026-45782
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.