# CVE-2026-81627: Qemu-kvm: vapic writable rom alias can escape the option-rom window and expose locked smram CVE-2026-81627 is fixed in 33 products on 1 platform, first by DEBIAN-CVE-2026-81627, released October 6, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-81627 - Priority: High - CVSS: 8.2 (Important) - EPSS: 0.0019 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Sep 18, 2026 - Weakness: Out-of-bounds Write - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81627 ## 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | qemu Debian 14 | 1:11.1.2+ds-1 | [DEBIAN-CVE-2026-81627](https://patchblox.com/security/data/fix/linux/debian-cve-2026-81627.md) | Oct 6, 2026 | | Linux | qemu amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu opensuse-leap 16.0 | 10.0.13-160000.2.1 | [OPENSUSE-SU-2026:22047-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22047-1.md) | Oct 7, 2026 | | Linux | qemu sles 16.0 | 10.0.13-160000.2.1 | [SUSE-SU-2026:24159-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24159-1.md) | Oct 7, 2026 | | Linux | qemu-common amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-common-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-debugsource amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-docs amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-guest-agent amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-guest-agent-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-img amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-img-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-kvm amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-kvm-core amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-linux-user opensuse-leap 16.0 | 10.0.13-160000.2.1 | [OPENSUSE-SU-2026:22047-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22047-1.md) | Oct 7, 2026 | | Linux | qemu-linux-user sles 16.0 | 10.0.13-160000.2.1 | [SUSE-SU-2026:24159-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24159-1.md) | Oct 7, 2026 | | Linux | qemu-pr-helper amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-pr-helper-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-system-aarch64 amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-system-aarch64-core amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-system-aarch64-core-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-system-x86 amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-system-x86-core amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-system-x86-core-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-tests amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-tests-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-tools amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-tools-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-user amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-user-binfmt amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-user-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-user-static amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-user-static-aarch64 amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-user-static-aarch64-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-user-static-x86 amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | | Linux | qemu-user-static-x86-debuginfo amzn 2023 | 2:11.0.0-4.amzn2023 | [ALAS2023-2026-3241](https://patchblox.com/security/data/fix/linux/alas2023-2026-3241.md) | Nov 7, 2026 | --- Data as of 2026-11-09T19:38:12Z UTC. 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