QEMU is widely used in virtualization and cloud; this VM escape lets guests read/write host files and run code, risking broad infrastructure compromise.
CVE-2026-93834
QEMU 9pfs race allows VM escape to host file read/write and code execution.
Is CVE-2026-93834 being exploited?
Not confirmed. CVE-2026-93834 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.40% probability of exploitation in the next 30 days.
How severe is CVE-2026-93834?
CVE-2026-93834 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-93834?
Yes. A fix has been recorded for CVE-2026-93834. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-93834 affect?
CVE-2026-93834 affects QEMU (9pfs subsystem), VMs using 9p/shared folders (9pfs), KVM/QEMU deployments and cloud hosts. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-93834?
Apply vendor QEMU patches immediately; disable/restrict 9pfs; isolate untrusted guests
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Malicious guest exploits 9pfs race to escape VM, read/write host files and execute code as the QEMU process user.
Immediate action required
public exploits
Unvetted proof-of-concept code on GitHub: 1 GitHub proof of concept
- suominen/CVE-2026-93834 · 2 ★
Listed so you can judge urgency, not as a recommendation to run anything. GitHub “proofs of concept” are unvetted: some are fake or carry malware. Exploit-DB marks the entries its staff verified.
cisa ssvc
- exploitation
- poc
- automatable
- no
- technical impact
- total
Assessed by CISA 25 Sept 2026 (SSVC 2.0.3).
timeline
- 25 Sept 2026Published
- 25 Sept 2026CISA SSVC assessment: exploitation poc · same day later
- 25 Sept 2026Analysed by vulneraibility.com · same day later
- 26 Sept 2026First proof-of-concept repository on GitHub (unvetted) · same day later
- 31 Oct 2026CVE record last updated · 35 days later
- Linkaccess.redhat.com /security/cve/CVE-2026-93834
- Linkbugzilla.redhat.com /show_bug.cgi?id=2537939
- Linkgitlab.com /qemu-project/qemu/-/work_items/4491
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- PoC-in-GitHub: GitHub repositories that claim a proof of concept
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.