{"id":"CVE-2026-45782","aliases":["EUVD-2026-35870","GHSA-f47p-p25q-83rh","openSUSE-SU-2026:10907-1"],"status":"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.","severity":{"version":"4.0","score":8.9,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00138,"percentile":0.03222,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-416"],"published":"2026-05-30T00:00:00Z","modified":"2026-10-28T02:30:48Z","fixes":[{"ecosystem":"openSUSE:Tumbleweed","package":"cloud-hypervisor","fixed_in":["52.0-1.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"cloud-hypervisor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"52.0-1.1"}]}]}],"products":[{"vendor":"cloud-hypervisor","product":"cloud-hypervisor"}],"references":[{"url":"https://github.com/cloud-hypervisor/cloud-hypervisor/security/advisories/GHSA-f47p-p25q-83rh","tags":["x_refsource_CONFIRM","advisory"]},{"url":"https://github.com/cloud-hypervisor/cloud-hypervisor/pull/8220","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/cloud-hypervisor/cloud-hypervisor/commit/1314ac883c641f1045bbb06dec0de045a3894baa","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v51.2","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v52.0","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45782.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45782","tags":["advisory"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-45782","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-45782","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.","status":"published","published":"2026-06-09T22:53:52.657Z","modified":"2026-06-10T16:32:33.406Z","cvss":[{"version":"4.0","score":8.9,"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","level":"high","assessor":"cna"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T13:46:43.922571Z"}],"euvd":[{"id":"EUVD-2026-35870","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.","status":"published","published":"2026-06-09T22:53:52Z","modified":"2026-06-10T16:32:33Z","cvss":[{"version":"4.0","score":8.9,"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","level":"high"}],"updated_at":"2026-11-02T18:20:44.937217Z"}],"nvd":[{"id":"CVE-2026-45782","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.","status":"published","published":"2026-06-10T00:16:53.267Z","modified":"2026-07-23T09:10:00.113Z","cvss":[{"version":"4.0","score":8.9,"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/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","level":"high","assessor":"secondary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:12:23.485267Z"}],"osv":[{"id":"CVE-2026-45782","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.","status":"published","published":"2026-06-09T22:53:52.657Z","modified":"2026-10-28T02:30:48.859972039Z","cvss":[{"version":"4.0","score":8.9,"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","level":"high"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T15:45:05.525666Z"},{"id":"openSUSE-SU-2026:10907-1","title":"cloud-hypervisor-52.0-1.1 on GA media","description":"These are all security issues fixed in the cloud-hypervisor-52.0-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-05-30T00:00:00Z","modified":"2026-05-31T14:15:05.04378287Z","updated_at":"2026-11-02T16:58:38.95195Z"}]}}