CVE-2026-77159: Red Hat Enterprise Linux 10 · UNIX Symbolic Link (Symlink) Following
Affects Red Hat Enterprise Linux 10Source CVE Database V5
Not known to be exploited · CVSS 5.5 Medium.
Data as of 26 Oct 2026, 17:16 UTC
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 11 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Red Hat Enterprise Linux 10libvirt | Affected– | Fixed in– |
| Red Hat Enterprise Linux 6libvirt | Affected– | Fixed in– |
| Red Hat Enterprise Linux 7libvirt | Affected– | Fixed in– |
| Red Hat Enterprise Linux 8virt:rhel/libvirt | Affected– | Fixed in– |
| Red Hat Enterprise Linux 9libvirt | Affected– | Fixed in– |
AI-suggested
Red Hat recommends ensuring SELinux is enabled and set to enforcing mode, which confines the swtpm process and restricts symlink creation and ownership changes, thereby reducing the vulnerability's impact. If SELinux is disabled or permissive, the system remains vulnerable.
Description
Libvirt is a C toolkit to interact with the virtualization capabilities of recent versions of Linux (and other OSes). The main package includes the libvirtd server exporting the virtualization support. Security Fix(es): 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.(CVE-2026-77159)