{"id":"CVE-2026-3842","summary":"Qemu-kvm: hyperv/syndbg: missing mapped-length guard after cpu_physical_memory_map causes host oob write","details":"A flaw was found in QEMU. This vulnerability allows a local attacker within a guest virtual machine to write data beyond its allocated memory. This occurs when cpu_physical_memory_map() returns a shorter length than expected, leading to an out-of-bounds write. Successful exploitation could result in unauthorized access to guest memory or corruption of heap-allocated objects, potentially causing information disclosure, data integrity issues, or a denial of service.","modified":"2026-07-18T03:31:53.818875056Z","published":"2026-07-16T00:20:02.910Z","related":["SUSE-SU-2026:21883-1","SUSE-SU-2026:21912-1","SUSE-SU-2026:2385-1","SUSE-SU-2026:2386-1","SUSE-SU-2026:2388-1"],"database_specific":{"cwe_ids":["CWE-787"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3842.json","cna_assigner":"fedora"},"references":[{"type":"WEB","url":"https://access.redhat.com/downloads/content/package-browser/"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3842.json"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-3842"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3842.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3842"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2458150"},{"type":"PACKAGE","url":"https://gitlab.com/qemu-project/qemu"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://gitlab.com/qemu-project/qemu","events":[{"introduced":"621da7789083b80d6f1ff1c0fb499334007b4f51"},{"fixed":"98b060da3a4f92b2a994ead5b16a87e783baf77c"}],"database_specific":{"extracted_events":[{"introduced":"7.1.0"},{"fixed":"11.0.0"}],"source":"AFFECTED_FIELD"}}],"versions":["v11.0.0-rc4","v11.0.0-rc3","v11.0.0-rc2","v11.0.0-rc1","v11.0.0-rc0","v10.2.0","v10.2.0-rc4","v10.2.0-rc3","v10.2.0-rc2","v10.2.0-rc1","v10.1.0","v10.1.0-rc4","v10.1.0-rc3","v10.1.0-rc2","v10.1.0-rc1","v10.1.0-rc0","v10.0.0","v10.0.0-rc4","v10.0.0-rc3","v10.0.0-rc2","v10.0.0-rc1","v10.0.0-rc0","v9.2.0","v9.2.0-rc3","v9.2.0-rc0","v9.2.0-rc2","v9.2.0-rc1","v9.1.0","v9.1.0-rc4","v9.1.0-rc3","v9.1.0-rc2","v9.1.0-rc1","v9.1.0-rc0","v9.0.0","v9.0.0-rc4","v9.0.0-rc3","v9.0.0-rc2","v9.0.0-rc1","v9.0.0-rc0","v8.2.0","v8.2.0-rc4","v8.2.0-rc3","v8.2.0-rc2","v8.2.0-rc1","v8.2.0-rc0","v8.1.0","v8.1.0-rc4","v8.1.0-rc3","v8.1.0-rc2","v8.1.0-rc1","v8.1.0-rc0","v8.0.0","v8.0.0-rc4","v8.0.0-rc3","v8.0.0-rc2","v7.2.0","v8.0.0-rc1","v8.0.0-rc0","v7.2.0-rc4","v7.2.0-rc3","v7.2.0-rc2","v7.2.0-rc1","v7.2.0-rc0","v7.1.0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-3842.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}