Summary
Package updates are available for Amazon Linux 2 that fix the following vulnerabilities: 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.
Fixed packages 32
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux · 2 | libvirt | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-admin | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-bash-completion | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-client | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon-config-network | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon-config-nwfilter | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon-driver-interface | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon-driver-lxc | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon-driver-network | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon-driver-nodedev | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon-driver-nwfilter | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon-driver-qemu | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon-driver-secret | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon-driver-storage | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon-driver-storage-core | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon-driver-storage-disk | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon-driver-storage-gluster | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon-driver-storage-iscsi | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon-driver-storage-logical | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon-driver-storage-mpath | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon-driver-storage-rbd | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon-driver-storage-scsi | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon-kvm | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-daemon-lxc | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-debuginfo | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-devel | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-docs | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-libs | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-lock-sanlock | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-login-shell | 0:4.5.0-36.amzn2.3.5 |
| Amazon Linux · 2 | libvirt-nss | 0:4.5.0-36.amzn2.3.5 |
Vulnerabilities 1
-
Medium 5.5
Libvirt: unsafe chown in qemutpmemulatorpreparehost() allows arbitrary file ownership change via symlink
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 w…
References
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-77159.html