CVE-2026-3886VulnerabilityPublished 10 Jun 2026

ZDI-26-332: QEMU calc_image_hostmem Integer Overflow Local Privilege Escalation Vulnerability

Source Zero Day Initiative

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Not known to be exploited.

Data as of 6 Aug 2026, 19:06 UTC

Severity

High

Rated High by Zero Day Initiative · No CVSS score from NVD or the CNA

Exploitation evidence

Disclosed: evidence found.
Public on cve.org; its publication date is not in this record
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

local

What to do

AI-suggested

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.

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.

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.

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.

References

zerodayinitiative.com/advisories/ZDI-26-332/ (opens in a new tab)

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