High [CVE-2026-93834] use-after-free race in Tlcreate/Twalk allows VM guest escape
This high-severity Red Hat Linux advisory covers CVE-2026-93834; related products: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
use-after-free race in Tlcreate/Twalk allows VM guest escape. Red Hat rates this important (CVSS 8.8).
Weakness: CWE-416.
Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux for NVIDIA 26; and 2 more.
Affected products named by the advisory: Red Hat OpenShift Container Platform 4; Red Hat package: qemu-kvm.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
Mitigation checklist
- Do not configure 9pfs/VirtFS filesystem sharing (-fsdev, -virtfs) on affected QEMU instances. If host-guest file sharing is required, use virtio-fs (virtiofsd) as an alternative, which does not use the vulnerable 9pfs code path.
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
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