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Vulnerability record · CVE-2026-3842 · published 16 July 2026

CVE-2026-3842: Out-of-bounds write vulnerability

A flaw was found in QEMU. This vulnerability allows a local attacker within a guest virtual machine to write data beyond its allocated memory. This occurs when cpu_physical_memory_map() returns a shorter length than expected, leading to an out-of-bounds write. Successful exploitation could result in unauthorized access to guest memory or corruption of heap-allocated objects, potentially causing information disclosure, data integrity issues, or a denial of service.

7.8 CVSS 3.1 High EPSS 0.17% · top 94.6% CWE-787 · Out-of-bounds write Awaiting Analysis
7.8CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
1 Sep 2026Last modified by NVD

Description

A flaw was found in QEMU. This vulnerability allows a local attacker within a guest virtual machine to write data beyond its allocated memory. This occurs when cpu_physical_memory_map() returns a shorter length than expected, leading to an out-of-bounds write. Successful exploitation could result in unauthorized access to guest memory or corruption of heap-allocated objects, potentially causing information disclosure, data integrity issues, or a denial of service.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://access.redhat.com/security/cve/CVE-2026-3842
https://bugzilla.redhat.com/show_bug.cgi?id=2458150
https://access.redhat.com/security/cve/CVE-2026-3842
https://bugzilla.redhat.com/show_bug.cgi?id=2458150
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3842.json

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Source: NIST National Vulnerability Database (record CVE-2026-3842), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.