ZDI-26-332: QEMU calc_image_hostmem Integer Overflow Local Privilege Escalation Vulnerability
This vulnerability allows local attackers to escalate privileges on affected installations of QEMU. An attacker must first obtain the ability to execute low-privileged code on the target guest system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 8.8. The following CVEs are assigned: CVE-2026-3886.
AI Analysis
Technical Summary
CVE-2026-3886 is a local privilege escalation vulnerability in QEMU affecting the virtio-gpu driver. The flaw arises from an integer overflow caused by insufficient validation of user input before buffer allocation. An attacker with low-privileged code execution on the guest can exploit this to escalate privileges and execute arbitrary code on the host. The vulnerability has a CVSS score of 8.8 and was publicly disclosed on June 9, 2026. QEMU has released a patch to fix this issue.
Potential Impact
An attacker who can execute low-privileged code on a QEMU guest system can exploit this vulnerability to escalate privileges on the host system and execute arbitrary code with elevated privileges. This compromises 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 the fixed version as soon as possible to mitigate the risk. Patch status is confirmed by the vendor advisory linked in the source content.
ZDI-26-332: QEMU calc_image_hostmem Integer Overflow Local Privilege Escalation Vulnerability
Description
This vulnerability allows local attackers to escalate privileges on affected installations of QEMU. An attacker must first obtain the ability to execute low-privileged code on the target guest system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 8.8. The following CVEs are assigned: CVE-2026-3886.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-3886 is a local privilege escalation vulnerability in QEMU affecting the virtio-gpu driver. The flaw arises from an integer overflow caused by insufficient validation of user input before buffer allocation. An attacker with low-privileged code execution on the guest can exploit this to escalate privileges and execute arbitrary code on the host. The vulnerability has a CVSS score of 8.8 and was publicly disclosed on June 9, 2026. QEMU has released a patch to fix this issue.
Potential Impact
An attacker who can execute low-privileged code on a QEMU guest system can exploit this vulnerability to escalate privileges on the host system and execute arbitrary code with elevated privileges. This compromises 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 the fixed version as soon as possible to mitigate the risk. Patch status is confirmed by the vendor advisory linked in the source content.
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: 06/10/2026, 16:50:43 UTC
Last enriched: 07/06/2026, 00:43:53 UTC
Last updated: 07/31/2026, 15:19:26 UTC
Views: 290
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.