{"id":"CVE-2026-10046","state":"PUBLISHED","title":"Out-of-bounds write in Napoca BIOS INT 0x15 E820 memory map handler (VA-13905)","description":"Bitdefender Napoca bare-metal hypervisor contains an out-of-bounds write vulnerability in the BIOS INT 0x15 / E820 memory map handler, implemented in napoca/guests/bios_handlers.c. The handler computes a destination offset into the guest RealModeMemory buffer from guest-controlled ES and EDI register values without validating that the resulting address remains within the 1MB RealModeMemory allocation. A malicious guest operating in real mode can trigger the issue by invoking INT 0x15 with AX=0xE820, EDX=0x534D4150, ECX greater than or equal to 20, EBX=0, ES=0xFFFF, and EDI=0xFFFF. This can cause a write of up to 20 bytes past the end of the RealModeMemory buffer into the hypervisor heap. The product is end-of-life and unsupported when assigned.","publishedAt":"2026-06-02T14:16:21.927Z","updatedAt":"2026-06-02T16:06:21.781Z","severity":{"score":8.5,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","source":"Bitdefender"},"assigner":"Bitdefender","products":["Bitdefender Napoca bare-metal hypervisor"],"affected":[{"vendor":"Bitdefender","product":"Napoca bare-metal hypervisor","defaultStatus":"affected","versions":[{"version":"all","status":"affected"}],"repo":"https://github.com/bitdefender/napoca"}],"references":["https://www.bitdefender.com/consumer/support/security-advisories/out-of-bounds-write-in-napoca-bios-int-0x15-e820-memory-map-handler-va-13905"],"weaknesses":["CWE-787"],"ingestedAt":"2026-10-29T20:10:33.477Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/10xxx/CVE-2026-10046.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-10046","state":"PUBLISHED","datePublished":"2026-06-02T14:16:21.927Z","dateUpdated":"2026-06-02T16:06:21.781Z","assignerShortName":"Bitdefender","assignerOrgId":"b3d5ebe7-963e-41fb-98e1-2edaeabb8f82","dateReserved":"2026-05-28T22:57:29.491Z"},"containers":{"cna":{"title":"Out-of-bounds write in Napoca BIOS INT 0x15 E820 memory map handler (VA-13905)","descriptions":[{"lang":"en","value":"Bitdefender Napoca bare-metal hypervisor contains an out-of-bounds write vulnerability in the BIOS INT 0x15 / E820 memory map handler, implemented in napoca/guests/bios_handlers.c. The handler computes a destination offset into the guest RealModeMemory buffer from guest-controlled ES and EDI register values without validating that the resulting address remains within the 1MB RealModeMemory allocation. A malicious guest operating in real mode can trigger the issue by invoking INT 0x15 with AX=0xE820, EDX=0x534D4150, ECX greater than or equal to 20, EBX=0, ES=0xFFFF, and EDI=0xFFFF. This can cause a write of up to 20 bytes past the end of the RealModeMemory buffer into the hypervisor heap. The product is end-of-life and unsupported when assigned."}],"affected":[{"vendor":"Bitdefender","product":"Napoca bare-metal hypervisor","defaultStatus":"affected","versions":[{"version":"all","status":"affected"}],"repo":"https://github.com/bitdefender/napoca"}],"references":[{"url":"https://www.bitdefender.com/consumer/support/security-advisories/out-of-bounds-write-in-napoca-bios-int-0x15-e820-memory-map-handler-va-13905"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":8.5,"vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","lang":"en","description":"CWE-787: Out-of-bounds Write","type":"CWE"}]}],"providerMetadata":{"shortName":"Bitdefender","orgId":"b3d5ebe7-963e-41fb-98e1-2edaeabb8f82","dateUpdated":"2026-06-02T14:16:21.927Z"},"datePublic":"2026-05-29T06:02:00.000Z","impacts":[{"descriptions":[{"lang":"en","value":"Overflow Buffers"}]}],"tags":["unsupported-when-assigned"],"workarounds":[{"lang":"en","value":"No workaround is available.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>No workaround is available.</p>"}]}],"solutions":[{"lang":"en","value":"No fix is planned because Bitdefender Napoca is end-of-life. Users should discontinue use of the unsupported product.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>No fix is planned because Bitdefender Napoca is end-of-life. Users should discontinue use of the unsupported product.</p>"}]}],"credits":[{"lang":"en","value":"Sebastián Alba Vives (@Sebasteuo / 0xS4bb1)","type":"finder"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.2"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-02T16:06:13.975351Z","id":"CVE-2026-10046","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":"2026-06-02T16:06:21.781Z"}}]}}}