CVE-2026-81627 QEMU - Privilege Escalation

QEMU contains a privilege escalation caused by improper validation of writable RAM alias in VAPIC setup hypercall, letting privileged guest users inject code into System Management Mode memory, exploit requires privileged guest access.

CVSS base score 8.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.19% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Privilege Escalation
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Published
18 September 2026
Updated
15 October 2026
Weakness
CWE-787

Vendor fix

Update to the latest QEMU version with the fix applied.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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