CVE-2026-81627— Qemu-kvm: vapic writable rom alias can escape the option-rom window and expose locked smram
Quick assessment
Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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
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I. Basic Information for CVE-2026-81627
Vulnerability Information
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Vulnerability Title
Qemu-kvm: vapic writable rom alias can escape the option-rom window and expose locked smram
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | - |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 6 | - |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 | - |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 7 | - |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 | - |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 8 | - |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 | - |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat Enterprise Linux for NVIDIA 26 | - |
cpe:/a:redhat:enterprise_linux_nvidia:
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 | - |
cpe:/a:redhat:openshift:4
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 | - |
cpe:/a:redhat:openshift:4
|
|
| Red Hat | Red Hat OpenStack Platform 13 (Queens) | - |
cpe:/a:redhat:openstack:13
|
|
II. Public POCs for CVE-2026-81627
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-81627 (1)
-
2536950 – (CVE-2026-81627) CVE-2026-81627 qemu-kvm: VAPIC writable ROM alias can escape the option-ROM window and expose locked SMRAM issue-tracking x_refsource_REDHAT
Other References for CVE-2026-81627 (1)
Other References for CVE-2026-81627 (1)
Same Patch Batch · Red Hat · 2026-09-18 · 37 CVEs total
| CVE-2026-93569 | 8.2 HIGH | Io.netty/netty-codec-http2: http/1 absolute-form host mismatch is translated to http/2 :au |
| CVE-2026-93565 | 7.5 HIGH | Io.netty/netty-codec-http: netty rtspdecoder method-token smuggling via trailing control b |
| CVE-2026-89059 | 7.5 HIGH | Resteasy-core: resteasy: iioimageprovider unbounded image decode (decompression-bomb dos) |
| CVE-2026-93494 | 7.5 HIGH | Io.netty/netty-codec-stomp: netty: bytebuf leak in stompsubframedecoder when a frame body |
| CVE-2026-87743 | 7.5 HIGH | Quarkus-vertx-http: authorization bypass via path normalization discrepancy in quarkus htt |
| CVE-2026-93575 | 7.5 HIGH | Io.netty/netty-codec-mqtt: netty: resource exhaustion in mqttdecoder |
| CVE-2026-93572 | 7.5 HIGH | Io.netty/netty-codec-redis: netty: redisarrayaggregator nested resp headers multiply patch |
| CVE-2026-93563 | 7.5 HIGH | Io.netty/netty-codec-smtp: netty: unbounded multi-line response accumulation in smtprespon |
| CVE-2026-93488 | 7.5 HIGH | Io.netty/netty-codec-http: netty: denial of service via unbounded concurrent spdy streams |
| CVE-2026-93491 | 7.5 HIGH | Io.netty/netty-codec-http: netty: denial of service via unbounded httpservercodec http/1.1 |
| CVE-2026-93560 | 7.5 HIGH | Io.netty/netty-codec-stomp: netty: stomp codec content-length long-to-int truncation cause |
| CVE-2026-93558 | 7.5 HIGH | Io.netty/netty-codec-http: netty: unbounded per-connection queue growth in websocketserver |
| CVE-2026-93564 | 7.5 HIGH | Io.netty/netty-codec-haproxy: netty: haproxy proxy-v2 nested-tlv grandchild bytebuf refere |
| CVE-2026-93567 | 7.5 HIGH | Io.netty/netty-codec-http2: http/1 authority-form connect is translated to malformed http/ |
| CVE-2026-93576 | 7.5 HIGH | Io.netty/netty-codec-smtp: netty netty-codec-smtp — smtp command-name field is not crlf-va |
| CVE-2026-93568 | 7.5 HIGH | Io.netty/netty-codec-http2: io.netty/netty-codec-http3: netty: http/2 and http/3 extended |
| CVE-2026-91149 | 7.5 HIGH | Cockpit: cockpit: denial of service via unbounded connection thread spawning |
| CVE-2026-89058 | 7.4 HIGH | Resteasy-core: resteasy: corsfilter reflects arbitrary origin with credentials under wildc |
| CVE-2026-93566 | 6.5 MEDIUM | Io.netty/netty-codec-http: netty: http request smuggling due to control characters in the |
| CVE-2026-93561 | 6.5 MEDIUM | Io.netty/netty-codec-memcache: netty: memcache binary codec signed/unsigned type mismatch |
Showing top 20 of 37 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
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-
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-
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Same weakness: CWE-787
-
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libheif uncompressed tiled image encoding allows out-of-boun -
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