Red Hat Enterprise Linux TPM Emulator qemuTPMEmulatorPrepareHost link following

CVSS Meta Temp Score
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CTI Interest Score
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4.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Red Hat Enterprise Linux. It has been classified as problematic. This affects the function qemuTPMEmulatorPrepareHost of the component TPM Emulator. Performing a manipulation results in link following. This vulnerability was named CVE-2026-77159. The attack needs to be approached locally. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Red Hat Enterprise Linux (unknown version). This affects the function qemuTPMEmulatorPrepareHost of the component TPM Emulator. The manipulation with an unknown input leads to a link following vulnerability. CWE is classifying the issue as CWE-59. The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. This is going to have an impact on integrity. The summary by CVE is:

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.

The advisory is shared at access.redhat.com. This vulnerability is uniquely identified as CVE-2026-77159 since 08/20/2026. The exploitability is told to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/16/2026).

The vulnerability scanner Nessus provides a plugin with the ID 344762 (Linux Distros Unpatched Vulnerability : CVE-2026-77159), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (344762), EUVD (EUVD-2026-76034) and CERT Bund (WID-SEC-2026-3312). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • SUSE Linux
  • Open Source libvirt

Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.4

VulDB Base Score: 3.3
VulDB Temp Score: 3.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.5
CNA Vector (redhat): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Link following
CWE: CWE-59
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 344762
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-77159

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

08/20/2026 CVE reserved
09/11/2026 +22 days Advisory disclosed
09/11/2026 +0 days VulDB entry created
09/16/2026 +5 days VulDB entry last update

Sourcesinfo

Vendor: redhat.com

Advisory: access.redhat.com
Status: Not defined

CVE: CVE-2026-77159 (🔒)
GCVE (CVE): GCVE-0-2026-77159
GCVE (VulDB): GCVE-100-402393
EUVD: 🔒
CERT Bund: WID-SEC-2026-3312 - libvirt: Schwachstelle ermöglicht Privilegieneskalation

Entryinfo

Created: 09/11/2026 12:57
Updated: 09/16/2026 12:33
Changes: 09/11/2026 12:57 (62), 09/12/2026 15:05 (2), 09/15/2026 18:41 (1), 09/16/2026 12:33 (7)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

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