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. Exploitation requires the attacker to have low-privileged code execution on the guest system. Successful exploitation allows arbitrary code execution on the host with escalated privileges. QEMU has issued an update to address this vulnerability.
AI Analysis
Technical Summary
CVE-2026-3886 is an integer overflow vulnerability in the calc_image_hostmem function of QEMU's virtio-gpu driver. The flaw arises from insufficient validation of user input, leading to an integer overflow before buffer allocation. This can be exploited by a local attacker who already has low-privileged code execution on the guest system to escalate privileges and execute arbitrary code on the host system. The vulnerability has a CVSS score of 8.8 (AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H). QEMU has released an update to fix this issue.
Potential Impact
Local attackers with low-privileged code execution on a guest system can exploit this vulnerability to escalate privileges and execute arbitrary code on the host system, potentially compromising the host'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 to remediate this issue. No additional mitigation steps are indicated by the vendor advisory.
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. Exploitation requires the attacker to have low-privileged code execution on the guest system. Successful exploitation allows arbitrary code execution on the host with escalated privileges. QEMU has issued an update to address this vulnerability.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-3886 is an integer overflow vulnerability in the calc_image_hostmem function of QEMU's virtio-gpu driver. The flaw arises from insufficient validation of user input, leading to an integer overflow before buffer allocation. This can be exploited by a local attacker who already has low-privileged code execution on the guest system to escalate privileges and execute arbitrary code on the host system. The vulnerability has a CVSS score of 8.8 (AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H). QEMU has released an update to fix this issue.
Potential Impact
Local attackers with low-privileged code execution on a guest system can exploit this vulnerability to escalate privileges and execute arbitrary code on the host system, potentially compromising the host'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 to remediate this issue. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Article Source
- {"url":"http://www.zerodayinitiative.com/advisories/ZDI-26-332/","fetched":true,"fetchedAt":"2026-06-10T16:50:33.712Z","wordCount":207}
Threat ID: 6a2995e3c9170919df3d3fcd
Added to database: 6/10/2026, 4:50:43 PM
Last enriched: 6/10/2026, 4:51:04 PM
Last updated: 6/10/2026, 6:17:53 PM
Views: 8
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