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Severity by source

Vendor (redhat) PRIMARY
HIGH
qualitative
NVD
8.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
vuln.today AI
7.8 HIGH

Guest-local attacker (AV:L/PR:L) must win a thread race (AC:H, unlike NVD's AC:L); VM escape crosses to the host (S:C) with full host CIA impact.

3.1 AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
SUSE
5.6 MEDIUM
AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
Red Hat
8.8 HIGH
qualitative

Primary rating from Vendor (redhat).

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Metadata Corrected
Sep 25, 2026 - 14:40 vuln.today
tag: Qemu added
Analysis Generated
Sep 25, 2026 - 14:36 vuln.today
CVE Published
Sep 25, 2026 - 13:36 nvd
HIGH 8.8

DescriptionNVD

A use-after-free vulnerability was found in QEMU's 9pfs subsystem. A race condition between the main thread and a worker thread when processing concurrent Tlcreate and Twalk requests allows a malicious guest user to craft a fid path containing stale heap data, bypassing directory traversal restrictions and escaping the shared directory boundary. This can lead to arbitrary host file read/write and code execution (VM escape) as the QEMU process user.

AnalysisAI

A use-after-free race condition in QEMU's 9pfs (virtfs) passthrough subsystem allows a malicious guest user to escape the shared directory boundary and read or write arbitrary files on the host, potentially achieving code execution as the QEMU process user (VM escape). Only hosts that have enabled 9pfs/virtfs host-directory sharing are exposed, since this is not a default configuration; the attacker must be a local guest user able to issue 9p protocol requests and must win a race between QEMU's main thread and a 9pfs worker thread with concurrent Tlcreate and Twalk requests. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Execution
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Vulnerability AssessmentAI

Exploitation Requires the host to be running QEMU with the 9pfs/virtfs filesystem passthrough feature enabled and a host directory shared into the guest - this is not a default configuration. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine high-priority flaw despite the absence of exploitation telemetry. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch status for CVE-2026-93834 should be verified at https://access.redhat.com/security/cve/CVE-2026-93834 and the upstream QEMU work item https://gitlab.com/qemu-project/qemu/-/work_items/4491, and Red Hat QEMU packages for RHEL 6 through 10, RHEL for NVIDIA 26, OpenShift Container Platform 4, and OpenStack Platform 13 Queens should be updated to the errata builds identified there as soon as they are published. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all RHEL 6 through 10, OpenShift Container Platform 4, and related Red Hat products running QEMU for enabled 9pfs/virtfs host-directory sharing; disable or remove virtfs/9p host mounts unless business-critical, and where unavoidable restrict to trusted guest workloads and read-only where possible. …

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Server 16.0 Affected
SUSE Linux Enterprise Server for SAP applications 16.0 Affected
SUSE Linux Micro 6.2 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected

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CVE-2026-93834 vulnerability details – vuln.today
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