ZDI-26-332: QEMU calc_image_hostmem Integer Overflow Local Privilege Escalation Vulnerability
A local privilege escalation vulnerability exists in QEMU's virtio-gpu driver due to an integer overflow caused by improper validation of user-supplied data. This flaw allows an attacker with low-privileged code execution on the guest system to escalate privileges and execute arbitrary code on the host system. The vulnerability has a high severity rating with a CVSS score of 8.8. QEMU has issued an update to address this issue.
AI Analysis
Technical Summary
CVE-2026-3886 is an integer overflow vulnerability in the virtio-gpu driver of QEMU. The vulnerability arises from insufficient validation of user-supplied data, leading to an integer overflow before buffer allocation. Exploitation requires local access with low privileges on the guest system, enabling an attacker to escalate privileges and execute arbitrary code on the host. The vulnerability was reported on 2025-10-15 and publicly disclosed on 2026-06-09. QEMU has released patches to fix this issue.
Potential Impact
Successful exploitation allows a local attacker who already has low-privileged code execution on the guest system to escalate privileges on the host system and execute arbitrary code with elevated privileges. This can compromise the host system's confidentiality, integrity, and availability.
Mitigation Recommendations
QEMU has issued an official update that corrects this vulnerability. Users should apply the vendor-provided patch or update QEMU to the fixed version as soon as possible to mitigate the risk. No additional mitigation steps are indicated beyond applying the official fix.
ZDI-26-332: QEMU calc_image_hostmem Integer Overflow Local Privilege Escalation Vulnerability
Description
A local privilege escalation vulnerability exists in QEMU's virtio-gpu driver due to an integer overflow caused by improper validation of user-supplied data. This flaw allows an attacker with low-privileged code execution on the guest system to escalate privileges and execute arbitrary code on the host system. The vulnerability has a high severity rating with a CVSS score of 8.8. QEMU has issued an update to address this issue.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-3886 is an integer overflow vulnerability in the virtio-gpu driver of QEMU. The vulnerability arises from insufficient validation of user-supplied data, leading to an integer overflow before buffer allocation. Exploitation requires local access with low privileges on the guest system, enabling an attacker to escalate privileges and execute arbitrary code on the host. The vulnerability was reported on 2025-10-15 and publicly disclosed on 2026-06-09. QEMU has released patches to fix this issue.
Potential Impact
Successful exploitation allows a local attacker who already has low-privileged code execution on the guest system to escalate privileges on the host system and execute arbitrary code with elevated privileges. This can compromise the host system's confidentiality, integrity, and availability.
Mitigation Recommendations
QEMU has issued an official update that corrects this vulnerability. Users should apply the vendor-provided patch or update QEMU to the fixed version as soon as possible to mitigate the risk. No additional mitigation steps are indicated beyond applying the official fix.
Technical Details
- Article Source
- {"url":"http://www.zerodayinitiative.com/advisories/ZDI-26-332/","fetched":true,"fetchedAt":"2026-06-10T16:50:33.712Z","wordCount":207}
- Classification
- {"confidence":0.95,"severitySource":"cvss-text","classifier":"rss-v2"}
Threat ID: 6a2995e3c9170919df3d3fcd
Added to database: 06/10/2026, 16:50:43 UTC
Last enriched: 08/06/2026, 19:06:35 UTC
Last updated: 09/12/2026, 13:34:06 UTC
Views: 395
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