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A flaw was found in QEMU. This vulnerability allows a local attacker within a guest virtual machine to write data beyond its allocated memory. (CVE-2026-3842)
Severity: mediumType: VulnerabilityCVE-2026-3842
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.
EPSS 0.1%top 98%
A flaw was found in QEMU. This vulnerability allows a local attacker within a guest virtual machine to write data beyond its allocated memory. (CVE-2026-3842)
0
MediumVulnerabilityCVE-2026-3842gcveosvubuntu-cve-2026-3842cve-2026-3842ubuntu-pro-14-04-ltsubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-pro-20-04-ltsubuntu-24-04-ltsubuntu-25-10ubuntu-26-04-lts
Published: 03/20/2026 (03/20/2026, 00:00:00 UTC)
Source: GCVE Database
Product: qemu
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 v3.1
Score 7.8high
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected software
qemu
pkg:deb/ubuntu/qemu?arch=source&distro=esm-infra-legacy/trustyAffected versions
=1.5.0+dfsg-3ubuntu5=1.5.0+dfsg-3ubuntu6=1.6.0+dfsg-2ubuntu1=1.6.0+dfsg-2ubuntu2=1.6.0+dfsg-2ubuntu3=1.6.0+dfsg-2ubuntu4=1.7.0+dfsg-2ubuntu1=1.7.0+dfsg-2ubuntu2=1.7.0+dfsg-2ubuntu3=1.7.0+dfsg-2ubuntu4=1.7.0+dfsg-2ubuntu5=1.7.0+dfsg-2ubuntu7=1.7.0+dfsg-2ubuntu8=1.7.0+dfsg-2ubuntu9=1.7.0+dfsg-3ubuntu1~ppa1=1.7.0+dfsg-3ubuntu1=1.7.0+dfsg-3ubuntu2=1.7.0+dfsg-3ubuntu3=1.7.0+dfsg-3ubuntu4=1.7.0+dfsg-3ubuntu5=1.7.0+dfsg-3ubuntu6=1.7.0+dfsg-3ubuntu7=2.0.0~rc1+dfsg-0ubuntu1=2.0.0~rc1+dfsg-0ubuntu2=2.0.0~rc1+dfsg-0ubuntu3=2.0.0~rc1+dfsg-0ubuntu3.1=2.0.0+dfsg-2ubuntu1=2.0.0+dfsg-2ubuntu1.1=2.0.0+dfsg-2ubuntu1.2=2.0.0+dfsg-2ubuntu1.3=2.0.0+dfsg-2ubuntu1.5=2.0.0+dfsg-2ubuntu1.6=2.0.0+dfsg-2ubuntu1.7=2.0.0+dfsg-2ubuntu1.8=2.0.0+dfsg-2ubuntu1.9=2.0.0+dfsg-2ubuntu1.10=2.0.0+dfsg-2ubuntu1.11=2.0.0+dfsg-2ubuntu1.13=2.0.0+dfsg-2ubuntu1.14=2.0.0+dfsg-2ubuntu1.15=2.0.0+dfsg-2ubuntu1.16=2.0.0+dfsg-2ubuntu1.17=2.0.0+dfsg-2ubuntu1.18=2.0.0+dfsg-2ubuntu1.19=2.0.0+dfsg-2ubuntu1.20=2.0.0+dfsg-2ubuntu1.21=2.0.0+dfsg-2ubuntu1.22=2.0.0+dfsg-2ubuntu1.24=2.0.0+dfsg-2ubuntu1.25=2.0.0+dfsg-2ubuntu1.26=2.0.0+dfsg-2ubuntu1.27=2.0.0+dfsg-2ubuntu1.28=2.0.0+dfsg-2ubuntu1.29=2.0.0+dfsg-2ubuntu1.30=2.0.0+dfsg-2ubuntu1.31=2.0.0+dfsg-2ubuntu1.32=2.0.0+dfsg-2ubuntu1.33=2.0.0+dfsg-2ubuntu1.34=2.0.0+dfsg-2ubuntu1.35=2.0.0+dfsg-2ubuntu1.36=2.0.0+dfsg-2ubuntu1.38=2.0.0+dfsg-2ubuntu1.39=2.0.0+dfsg-2ubuntu1.40=2.0.0+dfsg-2ubuntu1.41=2.0.0+dfsg-2ubuntu1.42=2.0.0+dfsg-2ubuntu1.43=2.0.0+dfsg-2ubuntu1.44=2.0.0+dfsg-2ubuntu1.45=2.0.0+dfsg-2ubuntu1.46=2.0.0+dfsg-2ubuntu1.47=2.0.0+dfsg-2ubuntu1.47+esm1=2.0.0+dfsg-2ubuntu1.47+esm2=2.0.0+dfsg-2ubuntu1.47+esm3=2.0.0+dfsg-2ubuntu1.47+esm4=2.0.0+dfsg-2ubuntu1.47+esm6
qemu
pkg:deb/ubuntu/qemu?arch=source&distro=esm-infra-legacy/xenialAffected versions
=1:2.3+dfsg-5ubuntu9=1:2.3+dfsg-5ubuntu10=1:2.4+dfsg-4ubuntu1=1:2.4+dfsg-4ubuntu2=1:2.4+dfsg-4ubuntu3=1:2.4+dfsg-5ubuntu3=1:2.5+dfsg-1ubuntu2=1:2.5+dfsg-1ubuntu3=1:2.5+dfsg-1ubuntu4=1:2.5+dfsg-1ubuntu5=1:2.5+dfsg-5ubuntu1=1:2.5+dfsg-5ubuntu2=1:2.5+dfsg-5ubuntu4=1:2.5+dfsg-5ubuntu6=1:2.5+dfsg-5ubuntu7=1:2.5+dfsg-5ubuntu10=1:2.5+dfsg-5ubuntu10.1=1:2.5+dfsg-5ubuntu10.2=1:2.5+dfsg-5ubuntu10.3=1:2.5+dfsg-5ubuntu10.4=1:2.5+dfsg-5ubuntu10.5=1:2.5+dfsg-5ubuntu10.6=1:2.5+dfsg-5ubuntu10.7=1:2.5+dfsg-5ubuntu10.8=1:2.5+dfsg-5ubuntu10.9=1:2.5+dfsg-5ubuntu10.10=1:2.5+dfsg-5ubuntu10.11=1:2.5+dfsg-5ubuntu10.13=1:2.5+dfsg-5ubuntu10.14=1:2.5+dfsg-5ubuntu10.15=1:2.5+dfsg-5ubuntu10.16=1:2.5+dfsg-5ubuntu10.20=1:2.5+dfsg-5ubuntu10.21=1:2.5+dfsg-5ubuntu10.22=1:2.5+dfsg-5ubuntu10.24=1:2.5+dfsg-5ubuntu10.25=1:2.5+dfsg-5ubuntu10.26=1:2.5+dfsg-5ubuntu10.28=1:2.5+dfsg-5ubuntu10.29=1:2.5+dfsg-5ubuntu10.30=1:2.5+dfsg-5ubuntu10.31=1:2.5+dfsg-5ubuntu10.32=1:2.5+dfsg-5ubuntu10.33=1:2.5+dfsg-5ubuntu10.34=1:2.5+dfsg-5ubuntu10.35=1:2.5+dfsg-5ubuntu10.36=1:2.5+dfsg-5ubuntu10.37=1:2.5+dfsg-5ubuntu10.38=1:2.5+dfsg-5ubuntu10.39=1:2.5+dfsg-5ubuntu10.40=1:2.5+dfsg-5ubuntu10.41=1:2.5+dfsg-5ubuntu10.42=1:2.5+dfsg-5ubuntu10.43=1:2.5+dfsg-5ubuntu10.44=1:2.5+dfsg-5ubuntu10.45=1:2.5+dfsg-5ubuntu10.46=1:2.5+dfsg-5ubuntu10.47=1:2.5+dfsg-5ubuntu10.48=1:2.5+dfsg-5ubuntu10.49=1:2.5+dfsg-5ubuntu10.51=1:2.5+dfsg-5ubuntu10.51+esm1=1:2.5+dfsg-5ubuntu10.51+esm2=1:2.5+dfsg-5ubuntu10.51+esm3=1:2.5+dfsg-5ubuntu10.51+esm4
qemu
pkg:deb/ubuntu/qemu?arch=source&distro=esm-infra/bionicAffected versions
=1:2.10+dfsg-0ubuntu3=1:2.10+dfsg-0ubuntu4=1:2.10+dfsg-0ubuntu5=1:2.11+dfsg-1ubuntu1=1:2.11+dfsg-1ubuntu2=1:2.11+dfsg-1ubuntu4=1:2.11+dfsg-1ubuntu5=1:2.11+dfsg-1ubuntu6=1:2.11+dfsg-1ubuntu7=1:2.11+dfsg-1ubuntu7.1=1:2.11+dfsg-1ubuntu7.2=1:2.11+dfsg-1ubuntu7.3=1:2.11+dfsg-1ubuntu7.4=1:2.11+dfsg-1ubuntu7.5=1:2.11+dfsg-1ubuntu7.6=1:2.11+dfsg-1ubuntu7.7=1:2.11+dfsg-1ubuntu7.8=1:2.11+dfsg-1ubuntu7.9=1:2.11+dfsg-1ubuntu7.10=1:2.11+dfsg-1ubuntu7.12=1:2.11+dfsg-1ubuntu7.13=1:2.11+dfsg-1ubuntu7.14=1:2.11+dfsg-1ubuntu7.15=1:2.11+dfsg-1ubuntu7.17=1:2.11+dfsg-1ubuntu7.18=1:2.11+dfsg-1ubuntu7.19=1:2.11+dfsg-1ubuntu7.20=1:2.11+dfsg-1ubuntu7.21=1:2.11+dfsg-1ubuntu7.22=1:2.11+dfsg-1ubuntu7.23=1:2.11+dfsg-1ubuntu7.25=1:2.11+dfsg-1ubuntu7.26=1:2.11+dfsg-1ubuntu7.27=1:2.11+dfsg-1ubuntu7.28=1:2.11+dfsg-1ubuntu7.29=1:2.11+dfsg-1ubuntu7.31=1:2.11+dfsg-1ubuntu7.32=1:2.11+dfsg-1ubuntu7.33=1:2.11+dfsg-1ubuntu7.34=1:2.11+dfsg-1ubuntu7.35=1:2.11+dfsg-1ubuntu7.36=1:2.11+dfsg-1ubuntu7.37=1:2.11+dfsg-1ubuntu7.38=1:2.11+dfsg-1ubuntu7.39=1:2.11+dfsg-1ubuntu7.40=1:2.11+dfsg-1ubuntu7.41=1:2.11+dfsg-1ubuntu7.42=1:2.11+dfsg-1ubuntu7.42+esm1=1:2.11+dfsg-1ubuntu7.42+esm2=1:2.11+dfsg-1ubuntu7.42+esm5=1:2.11+dfsg-1ubuntu7.42+esm6
qemu
pkg:deb/ubuntu/qemu?arch=source&distro=esm-infra/focalAffected versions
=1:4.0+dfsg-0ubuntu9=1:4.0+dfsg-0ubuntu10=1:4.2-1ubuntu1=1:4.2-1ubuntu2=1:4.2-3ubuntu1=1:4.2-3ubuntu2=1:4.2-3ubuntu3=1:4.2-3ubuntu4=1:4.2-3ubuntu5=1:4.2-3ubuntu6=1:4.2-3ubuntu6.1=1:4.2-3ubuntu6.2=1:4.2-3ubuntu6.3=1:4.2-3ubuntu6.4=1:4.2-3ubuntu6.5=1:4.2-3ubuntu6.6=1:4.2-3ubuntu6.7=1:4.2-3ubuntu6.8=1:4.2-3ubuntu6.9=1:4.2-3ubuntu6.10=1:4.2-3ubuntu6.11=1:4.2-3ubuntu6.12=1:4.2-3ubuntu6.14=1:4.2-3ubuntu6.15=1:4.2-3ubuntu6.16=1:4.2-3ubuntu6.17=1:4.2-3ubuntu6.18=1:4.2-3ubuntu6.19=1:4.2-3ubuntu6.21=1:4.2-3ubuntu6.23=1:4.2-3ubuntu6.24=1:4.2-3ubuntu6.25=1:4.2-3ubuntu6.26=1:4.2-3ubuntu6.27=1:4.2-3ubuntu6.28=1:4.2-3ubuntu6.29=1:4.2-3ubuntu6.30=1:4.2-3ubuntu6.30+esm1=1:4.2-3ubuntu6.30+esm2=1:4.2-3ubuntu6.30+esm3
qemu
pkg:deb/ubuntu/qemu?arch=source&distro=nobleAffected versions
<1:8.2.2+ds-0ubuntu1.16=1:8.0.4+dfsg-1ubuntu3=1:8.0.4+dfsg-1ubuntu4=1:8.0.4+dfsg-1ubuntu5=1:8.1.3+ds-1ubuntu2=1:8.2.1+ds-1ubuntu1=1:8.2.1+ds-1ubuntu8=1:8.2.1+ds-1ubuntu9=1:8.2.2+ds-0ubuntu1=1:8.2.2+ds-0ubuntu1.2=1:8.2.2+ds-0ubuntu1.4=1:8.2.2+ds-0ubuntu1.5=1:8.2.2+ds-0ubuntu1.6=1:8.2.2+ds-0ubuntu1.7=1:8.2.2+ds-0ubuntu1.8=1:8.2.2+ds-0ubuntu1.9=1:8.2.2+ds-0ubuntu1.10=1:8.2.2+ds-0ubuntu1.11=1:8.2.2+ds-0ubuntu1.12=1:8.2.2+ds-0ubuntu1.13=1:8.2.2+ds-0ubuntu1.14=1:8.2.2+ds-0ubuntu1.15
qemu
pkg:deb/ubuntu/qemu?arch=source&distro=questingAffected versions
<1:10.1.0+ds-5ubuntu2.6=1:9.2.1+ds-1ubuntu5=1:10.0.2+ds-1ubuntu1=1:10.0.2+ds-1ubuntu2=1:10.1.0+ds-1ubuntu1=1:10.1.0+ds-5ubuntu1=1:10.1.0+ds-5ubuntu2=1:10.1.0+ds-5ubuntu2.1=1:10.1.0+ds-5ubuntu2.2=1:10.1.0+ds-5ubuntu2.4=1:10.1.0+ds-5ubuntu2.5
qemu
pkg:deb/ubuntu/qemu?arch=source&distro=resoluteAffected versions
=1:10.1.0+ds-5ubuntu2=1:10.1.0+ds-5ubuntu3=1:10.1.0+ds-5ubuntu4=1:10.1.0+ds-5ubuntu5=1:10.2.1+ds-1ubuntu1=1:10.2.1+ds-1ubuntu2=1:10.2.1+ds-1ubuntu3=1:10.2.1+ds-1ubuntu3.1=1:10.2.1+ds-1ubuntu3.2
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Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-3842
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 3.1
Patch Information
Threat ID: 6a74cf9ebf8831d5391b0430
Added to database: 08/06/2026, 18:17:02 UTC
Last updated: 08/07/2026, 02:16:48 UTC
Views: 2
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