{"id":"CVE-2026-45782","state":"PUBLISHED","title":"Cloud Hypervisor: Use-after-free in virtio-block Async I/O Completion","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.","publishedAt":"2026-06-09T22:53:52.657Z","updatedAt":"2026-06-10T16:32:33.406Z","severity":{"score":8.9,"label":"High","version":"4.0","vector":"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":"GitHub_M"},"assigner":"GitHub_M","products":["cloud-hypervisor cloud-hypervisor"],"affected":[{"vendor":"cloud-hypervisor","product":"cloud-hypervisor","versions":[{"version":">= 21.0, < 51.2","status":"affected"}]}],"references":["https://github.com/cloud-hypervisor/cloud-hypervisor/security/advisories/GHSA-f47p-p25q-83rh","https://github.com/cloud-hypervisor/cloud-hypervisor/pull/8220","https://github.com/cloud-hypervisor/cloud-hypervisor/commit/1314ac883c641f1045bbb06dec0de045a3894baa","https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v51.2","https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v52.0"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/45xxx/CVE-2026-45782.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-45782","state":"PUBLISHED","datePublished":"2026-06-09T22:53:52.657Z","dateUpdated":"2026-06-10T16:32:33.406Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-13T07:45:21.252Z"},"containers":{"cna":{"title":"Cloud Hypervisor: Use-after-free in virtio-block Async I/O Completion","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"cloud-hypervisor","product":"cloud-hypervisor","versions":[{"version":">= 21.0, < 51.2","status":"affected"}]}],"references":[{"url":"https://github.com/cloud-hypervisor/cloud-hypervisor/security/advisories/GHSA-f47p-p25q-83rh","name":"https://github.com/cloud-hypervisor/cloud-hypervisor/security/advisories/GHSA-f47p-p25q-83rh","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/cloud-hypervisor/cloud-hypervisor/pull/8220","name":"https://github.com/cloud-hypervisor/cloud-hypervisor/pull/8220","tags":["x_refsource_MISC"]},{"url":"https://github.com/cloud-hypervisor/cloud-hypervisor/commit/1314ac883c641f1045bbb06dec0de045a3894baa","name":"https://github.com/cloud-hypervisor/cloud-hypervisor/commit/1314ac883c641f1045bbb06dec0de045a3894baa","tags":["x_refsource_MISC"]},{"url":"https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v51.2","name":"https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v51.2","tags":["x_refsource_MISC"]},{"url":"https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v52.0","name":"https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v52.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","subAvailabilityImpact":"HIGH","baseScore":8.9,"baseSeverity":"HIGH","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","lang":"en","description":"CWE-416: Use After Free","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-06-09T22:53:52.657Z"},"source":{"advisory":"GHSA-f47p-p25q-83rh","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-10T15:58:34.973878Z","id":"CVE-2026-45782","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-10T16:32:33.406Z"}}]}}}