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VulnerabilityPublished Updated

CVE-2026-77159: Red Hat Enterprise Linux 10 · UNIX Symbolic Link (Symlink) Following

Affects Red Hat Enterprise Linux 10Source CVE Database V5

0

Not known to be exploited · CVSS 5.5 Medium.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score
5.5Medium
How severe the flaw is on the 0–10 CVSS scale.
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
Red Hat Enterprise Linux 10libvirtAffected–Fixed in–
Red Hat Enterprise Linux 6libvirtAffected–Fixed in–
Red Hat Enterprise Linux 7libvirtAffected–Fixed in–
Red Hat Enterprise Linux 8virt:rhel/libvirtAffected–Fixed in–
Red Hat Enterprise Linux 9libvirtAffected–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)

References

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