{"id":"CVE-2026-81627","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-81627","generatedAt":"2026-10-28T03:30:46.809Z","title":"A privileged guest user on a Q35/KVM machine can position this alias over locked SMRAM, bypassing chipset D_LCK protection and injecting code into System Management Mode memory.","description":"A flaw was found in QEMU. The VAPIC setup hypercall in hw/i386/vapic.c does not validate that the writable RAM alias remains within the option ROM window. A privileged guest user on a Q35/KVM machine can position this alias over locked SMRAM, bypassing chipset D_LCK protection and injecting code into System Management Mode memory.","published":"2026-09-18T11:17:18.000Z","lastModified":"2026-09-21T12:17:20.000Z","status":"Awaiting Analysis","sourceIdentifier":"secalert@redhat.com","cvss":{"version":"3.1","score":8.2,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H"},"cwe":["CWE-787"],"affected":[],"epss":{"score":0.00192,"percentile":0.08726,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.19%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"scored","label":"Newly scored","at":"2026-09-21T13:00:08.000Z","detail":{"from":"6.7","score":"8.2","severity":"HIGH","fromSeverity":"MEDIUM"},"summary":"Now scored CVSS 8.2 HIGH (was 6.7)."}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-81627","source":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536950","source":"secalert@redhat.com"},{"url":"https://gitlab.com/qemu-project/qemu/-/work_items/4206","source":"secalert@redhat.com"},{"url":"https://gitlab.com/qemu-project/qemu/-/work_items/4206","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-81627","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}