{"id":"CVE-2026-3842","aliases":["AZL-92502","BELL-CVE-2026-3842","DEBIAN-CVE-2026-3842","EUVD-2026-44840","GHSA-6mwr-p34x-55cv","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","UBUNTU-CVE-2026-3842"],"status":"published","title":"Qemu-kvm: hyperv/syndbg: missing mapped-length guard after cpu_physical_memory_map causes host oob write","description":"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.","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00167,"percentile":0.06062,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-787"],"published":"2026-03-20T00:00:00Z","modified":"2026-11-05T05:40:51Z","fixes":[{"ecosystem":"Azure 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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.","status":"published","published":"2026-07-16T00:20:02.91Z","modified":"2026-10-28T02:30:24.391264092Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T15:45:03.040464Z"},{"id":"DEBIAN-CVE-2026-3842","description":"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.","status":"published","published":"2026-07-16T01:16:30.697Z","modified":"2026-10-01T03:03:22.462573223Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:54.892385Z"},{"id":"UBUNTU-CVE-2026-3842","description":"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.","status":"published","published":"2026-03-20T00:00:00Z","modified":"2026-10-22T23:20:14.373911255Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T16:56:16.686388Z"},{"id":"AZL-92502","title":"CVE-2026-3842 affecting package qemu for versions less than 9.1.0-11","description":"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.","status":"published","published":"2026-07-16T01:16:30Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:25.880689Z"},{"id":"SUSE-SU-2026:21883-1","title":"Security update for qemu","description":"This update for qemu fixes the following issues\n\n- CVE-2025-14876: qemu-kvm: Unbounded allocation in virtio-crypto (bsc#1255400).\n- CVE-2026-0665: out-of-bounds heap access can lead to a denial of service or potential memory corruption (bsc#1256484).\n- CVE-2026-2243: incorrect bounds check leads to heap out-of-bounds read and a 12-byte information leak when processing\n  specially crafted VMDK files (bsc#1258509).\n- CVE-2026-3195: heap buffer overflow when reading input audio in the virtio-snd device input callback due to\n  insufficient checks in `virtio_snd_pcm_in_cb` (bsc#1259080).\n- CVE-2026-3196: integer overflow in the virtio-snd device via PCM_INFO requests from the guest leads to unbounded\n  memory allocation and host denial-of-service (bsc#1259079).\n- CVE-2026-3842: hyperv/syndbg: missing mapped-length guard after cpu_physical_memory_map causes host OOB write\n  (bsc#1262089).\n","status":"published","published":"2026-06-01T13:45:56Z","modified":"2026-06-03T18:24:40.689343957Z","updated_at":"2026-11-02T15:54:02.654057Z"},{"id":"SUSE-SU-2026:21912-1","title":"Security update for qemu","description":"This update for qemu fixes the following issues\n\n- CVE-2025-14876: qemu-kvm: Unbounded allocation in virtio-crypto (bsc#1255400).\n- CVE-2026-0665: out-of-bounds heap access can lead to a denial of service or potential memory corruption (bsc#1256484).\n- CVE-2026-2243: incorrect bounds check leads to heap out-of-bounds read and a 12-byte information leak when processing\n  specially crafted VMDK files (bsc#1258509).\n- CVE-2026-3195: heap buffer overflow when reading input audio in the virtio-snd device input callback due to\n  insufficient checks in `virtio_snd_pcm_in_cb` (bsc#1259080).\n- CVE-2026-3196: integer overflow in the virtio-snd device via PCM_INFO requests from the guest leads to unbounded\n  memory allocation and host denial-of-service (bsc#1259079).\n- CVE-2026-3842: hyperv/syndbg: missing mapped-length guard after cpu_physical_memory_map causes host OOB write\n  (bsc#1262089).\n","status":"published","published":"2026-05-28T14:52:19Z","modified":"2026-06-03T18:24:24.018223733Z","updated_at":"2026-11-02T15:54:02.654057Z"},{"id":"SUSE-SU-2026:2385-1","title":"Security update for qemu","description":"This update for qemu fixes the following issues:\n\n- CVE-2026-2243: incorrect bounds check leads to heap out-of-bounds read and a 12-byte information leak when processing\n  specially crafted VMDK files (bsc#1258509).\n- CVE-2026-3195: heap buffer overflow when reading input audio in the virtio-snd device input callback due to\n  insufficient checks in `virtio_snd_pcm_in_cb` (bsc#1259080).\n- CVE-2026-3196: integer overflow in the virtio-snd device via PCM_INFO requests from the guest leads to unbounded\n  memory allocation and host denial-of-service (bsc#1259079).\n- CVE-2026-3842: hyperv/syndbg: missing mapped-length guard after cpu_physical_memory_map causes host OOB write\n  (bsc#1262089).\n","status":"published","published":"2026-06-12T13:52:42Z","modified":"2026-06-13T08:00:05.404451164Z","updated_at":"2026-11-02T15:54:03.991985Z"},{"id":"SUSE-SU-2026:2386-1","title":"Security update for qemu","description":"This update for qemu fixes the following issues:\n\n- CVE-2025-14876: qemu-kvm: Unbounded allocation in virtio-crypto (bsc#1255400).\n- CVE-2026-0665: out-of-bounds heap access can lead to a denial of service or potential memory corruption (bsc#1256484).\n- CVE-2026-2243: incorrect bounds check leads to heap out-of-bounds read and a 12-byte information leak when processing\n  specially crafted VMDK files (bsc#1258509).\n- CVE-2026-3195: heap buffer overflow when reading input audio in the virtio-snd device input callback due to\n  insufficient checks in `virtio_snd_pcm_in_cb` (bsc#1259080).\n- CVE-2026-3196: integer overflow in the virtio-snd device via PCM_INFO requests from the guest leads to unbounded\n  memory allocation and host denial-of-service (bsc#1259079).\n- CVE-2026-3842: hyperv/syndbg: missing mapped-length guard after cpu_physical_memory_map causes host OOB write\n  (bsc#1262089).\n","status":"published","published":"2026-06-12T13:54:09Z","modified":"2026-06-13T08:00:06.874364567Z","updated_at":"2026-11-02T15:54:03.991985Z"},{"id":"SUSE-SU-2026:2388-1","title":"Security update for qemu","description":"This update for qemu fixes the following issues:\n\nSecurity fixes:\n\n- CVE-2026-2243: incorrect bounds check leads to heap out-of-bounds read and a 12-byte information leak when processing\n  specially crafted VMDK files (bsc#1258509).\n- CVE-2026-3842: hyperv/syndbg: missing mapped-length guard after cpu_physical_memory_map causes host OOB write\n  (bsc#1262089).\n\nOther fixes:\n\n- [openSUSE] qemu-ga: fix service file against no-autostart (bsc#1199023)\n","status":"published","published":"2026-06-12T13:59:30Z","modified":"2026-06-13T08:00:06.86249632Z","updated_at":"2026-11-02T15:54:03.991985Z"}]}}