EUVD-2026-76034
GHSA-wmhq-5pq5-8474
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Local attack requiring swtpm account (PR:L), no race condition so AC:L, pure integrity impact via arbitrary chown(), no confidentiality or availability effect.
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
Lifecycle Timeline
3DescriptionCVE.org
A symlink-following flaw was found in libvirt's qemuTPMEmulatorPrepareHost() function. The function uses a path-based chown() on the swtpm logfile without checking for symbolic links. A local attacker with access to the swtpm account can replace the logfile with a symlink, causing libvirtd (running as root) to transfer ownership of an arbitrary file to the swtpm user.
AnalysisAI
Symlink-following in libvirt's qemuTPMEmulatorPrepareHost() allows a local attacker with access to the swtpm service account to redirect a path-based chown() call - executed by libvirtd running as root - to transfer ownership of any arbitrary file on the system to the swtpm user. This affects libvirt on Red Hat Enterprise Linux 6 through 10. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) local shell access as the swtpm service account - this is a dedicated low-privilege OS user created when swtpm is installed, not a general user account; (2) libvirt must be configured to use software TPM emulation (swtpm) for at least one virtual machine, so that qemuTPMEmulatorPrepareHost() is actually invoked; (3) libvirtd must be running as root (standard deployment on RHEL). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 5.5 (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N) accurately reflects the local, low-privilege attack vector and pure-integrity impact. … 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 | Upstream fix is under review in GitLab work item #909 (https://gitlab.com/libvirt/libvirt/-/work_items/909); a released patched version has not been independently confirmed from the available data - monitor https://access.redhat.com/security/cve/CVE-2026-77159 for RHEL errata. … Detailed patch versions, workarounds, and compensating controls in full report. |
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