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CVE-2026-3195: Heap-based Buffer Overflow

0
High
VulnerabilityCVE-2026-3195gcveosvubuntu-cve-2026-3195cve-2026-3195ubuntu-24-04-ltsubuntu-25-10ubuntu-26-04-ltscwe-122
Published: 06/19/2026 (06/19/2026, 16:23:57 UTC)
Source: GCVE Database

Description

CVE-2026-3195 is a heap-based buffer overflow vulnerability in QEMU's virtio-snd device input callback function, virtio_snd_pcm_in_cb. The flaw arises from insufficient bounds checking on the input buffer, potentially leading to out-of-bounds writes. This vulnerability is a regression from an incomplete fix for CVE-2024-7730. It affects multiple Ubuntu package versions of QEMU and can allow an attacker inside a guest virtual machine to cause a denial of service or possibly execute arbitrary code on the host. A fix has been released by Ubuntu in updated QEMU package versions.

CVSS v3.1

Score 7.4high

Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected software

Ubuntu:24.04:LTSmore threats →ghsa
qemu
pkg:deb/ubuntu/qemu?arch=source&distro=noble
Affected 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
Ubuntu:25.10more threats →ghsa
qemu
pkg:deb/ubuntu/qemu?arch=source&distro=questing
Affected 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
Ubuntu:26.04:LTSmore threats →ghsa
qemu
pkg:deb/ubuntu/qemu?arch=source&distro=resolute
Affected 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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AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 09/12/2026, 06:47:20 UTC

Technical Analysis

The vulnerability CVE-2026-3195 in QEMU involves a heap out-of-bounds write due to the virtio_snd_pcm_in_cb function not properly verifying that the iov buffer can accommodate the incoming audio data. This issue is a result of an incomplete remediation of a previous vulnerability (CVE-2024-7730). Exploitation requires attacker control inside the guest VM and can lead to host crashes or arbitrary code execution. Ubuntu has addressed this vulnerability in updated QEMU packages for Ubuntu 24.04 LTS and 25.10 releases.

Potential Impact

An attacker with access inside a guest virtual machine can exploit this vulnerability to cause QEMU to crash, resulting in a denial of service, or potentially execute arbitrary code on the host system. This elevates the risk to the host environment from a compromised guest VM.

Mitigation Recommendations

Ubuntu has released fixed QEMU package versions that address this vulnerability. Users should apply the standard system updates and then restart all QEMU virtual machines to ensure the fixes take effect. Refer to the Ubuntu Security Notice USN-8161-1 for detailed update instructions.

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Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-3195
Osv Schema Version
1.7.0
Ecosystems
["Ubuntu:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
Cvss Version
3.1
State
PUBLISHED

Patch Information

Threat ID: 6a74cf9ebf8831d5391b043b

Added to database: 08/06/2026, 18:17:02 UTC

Last enriched: 09/12/2026, 06:47:20 UTC

Last updated: 10/05/2026, 18:48:19 UTC

Views: 48

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