CVE-2026-3842 | QEMU KVM hw/hyperv/syndbg.c cpu_physical_memory_map out-of-bounds write

VDB-358018 · CVE-2026-3842 · GCVE-0-2026-3842 QEMU KVM HW/HYPERV/SYNDBG.C CPU_PHYSICAL_MEMORY_MAP OUT-OF-BOUNDS WRITE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.3 $0-$5k 4.07+ Summaryinfo A vulnerability labeled as critical has been found in QEMU. Affected by this issue is the function cpu_physical_memory_map of the file hw/hyperv/syndbg.c of the component KVM. Executing a manipulation can lead to out-of-bounds write. This vulnerability appears as CVE-2026-3842. The physical device can be targeted for the attack. There is no available exploit. A patch should be applied to remediate this issue. Detailsinfo A vulnerability was found in QEMU (the affected version unknown). It has been declared as critical. This vulnerability affects the function cpu_physical_memory_map of the file hw/hyperv/syndbg.c of the component KVM. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The advisory is available at bugzilla.redhat.com. This vulnerability was named CVE-2026-3842. The exploitation appears to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 04/17/2026). Applying the patch 4f28b87fdd24df2049626106b7c24d0180952115 is able to eliminate this problem. The bugfix is ready for download at gitlab.com. Productinfo Type Virtualization Software Name QEMU License open-source Website Product: https://www.qemu.org/ CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.6 VulDB Meta Temp Score: 6.3 VulDB Base Score: 6.6 VulDB Temp Score: 6.3 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Out-of-bounds write CWE: CWE-787 / CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: Yes Local: Yes Remote: No Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Patch Status: 🔍 0-Day Time: 🔒 Patch: 4f28b87fdd24df2049626106b7c24d0180952115 Timelineinfo 04/17/2026 Advisory disclosed 04/17/2026 +0 days VulDB entry created 04/17/2026 +0 days VulDB entry last update Sourcesinfo Product: qemu.org Advisory: bugzilla.redhat.com Status: Confirmed CVE: CVE-2026-3842 (🔒) GCVE (CVE): GCVE-0-2026-3842 GCVE (VulDB): GCVE-100-358018 Entryinfo Created: 04/17/2026 06:54 Changes: 04/17/2026 06:54 (54) Complete: 🔍 Cache ID: 99:F70:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸