Vulnerability in Red Hat Enterprise Linux 10
CVE-2026-77159
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.
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
Affected products
Weakness classification (CWE)
References
- secalert@redhat.com (x_refsource_REDHAT, vdb-entry)
- secalert@redhat.com (x_refsource_REDHAT, issue-tracking)
- secalert@redhat.com
Frequently asked questions
- What is CVE-2026-77159?
- CVE-2026-77159 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under UNIX Symbolic Link (Symlink) Following. CVSS score: 5.5/10. Published 2026-09-11.
- How severe is CVE-2026-77159?
- Medium severity. CVSS v3 base score is 5.5 out of 10.