CVE-2026-3842

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Source
https://cve.org/CVERecord?id=CVE-2026-3842
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-3842.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-3842
Downstream
Related
Published
2026-07-16T00:20:02.910Z
Modified
2026-07-18T03:31:53.818875056Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
Qemu-kvm: hyperv/syndbg: missing mapped-length guard after cpu_physical_memory_map causes host oob write
Details

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 cpuphysicalmemory_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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3842.json",
    "cwe_ids": [
        "CWE-787"
    ],
    "cna_assigner": "fedora"
}
References

Affected packages

Git / gitlab.com/qemu-project/qemu

Affected ranges

Type
GIT
Repo
https://gitlab.com/qemu-project/qemu
Events
Introduced
621da7789083b80d6f1ff1c0fb499334007b4f51
Fixed
98b060da3a4f92b2a994ead5b16a87e783baf77c
Database specific 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "7.1.0"
        },
        {
            "fixed": "11.0.0"
        }
    ]
}

Affected versions

v10.*
v10.0.0
v10.0.0-rc0
v10.0.0-rc1
v10.0.0-rc2
v10.0.0-rc3
v10.0.0-rc4
v10.1.0
v10.1.0-rc0
v10.1.0-rc1
v10.1.0-rc2
v10.1.0-rc3
v10.1.0-rc4
v10.2.0
v10.2.0-rc1
v10.2.0-rc2
v10.2.0-rc3
v10.2.0-rc4
v11.*
v11.0.0-rc0
v11.0.0-rc1
v11.0.0-rc2
v11.0.0-rc3
v11.0.0-rc4
v7.*
v7.1.0
v7.2.0
v7.2.0-rc0
v7.2.0-rc1
v7.2.0-rc2
v7.2.0-rc3
v7.2.0-rc4
v8.*
v8.0.0
v8.0.0-rc0
v8.0.0-rc1
v8.0.0-rc2
v8.0.0-rc3
v8.0.0-rc4
v8.1.0
v8.1.0-rc0
v8.1.0-rc1
v8.1.0-rc2
v8.1.0-rc3
v8.1.0-rc4
v8.2.0
v8.2.0-rc0
v8.2.0-rc1
v8.2.0-rc2
v8.2.0-rc3
v8.2.0-rc4
v9.*
v9.0.0
v9.0.0-rc0
v9.0.0-rc1
v9.0.0-rc2
v9.0.0-rc3
v9.0.0-rc4
v9.1.0
v9.1.0-rc0
v9.1.0-rc1
v9.1.0-rc2
v9.1.0-rc3
v9.1.0-rc4
v9.2.0
v9.2.0-rc0
v9.2.0-rc1
v9.2.0-rc2
v9.2.0-rc3

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-3842.json"