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CVE-2026-77159— Libvirt: unsafe chown in qemutpmemulatorpreparehost() allows arbitrary file ownership change via symlink

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libvirt是libvirt组织开源的一个虚拟化管理工具。 libvirt存在后置链接漏洞，该漏洞源于libvirt的qemuTPMEmulatorPrepareHost()函数对swtpm日志文件执行基于路径的chown()时未检查符号链接，本地攻击者可将日志文件替换为符号链接，导致以root运行的libvirtd将任意文件所有权转移给swtpm用户。

CVSS 5.5 · Medium EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1308

Affected Version Matrix 5

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 6 any unaffected
Red Hat Red Hat Enterprise Linux 7 any unknown
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
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I. Basic Information for CVE-2026-77159

Vulnerability Information
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Vulnerability Title
Libvirt: unsafe chown in qemutpmemulatorpreparehost() allows arbitrary file ownership change via symlink
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-61
Source: CVE Program / CVE List V5
Vulnerability Title
libvirt 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libvirt是libvirt组织开源的一个虚拟化管理工具。 libvirt存在后置链接漏洞，该漏洞源于libvirt的qemuTPMEmulatorPrepareHost()函数对swtpm日志文件执行基于路径的chown()时未检查符号链接，本地攻击者可将日志文件替换为符号链接，导致以root运行的libvirtd将任意文件所有权转移给swtpm用户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-77159

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III. Intelligence Information for CVE-2026-77159

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Vendor Advisories for CVE-2026-77159 (2)

Security Blog Posts for CVE-2026-77159 (1)

Same Patch Batch · Red Hat · 2026-09-11 · 5 CVEs total

CVE-2026-89329 6.2 MEDIUM Device-mapper-multipath: local denial of service via blocking ipc send operations
CVE-2026-18495 6.1 MEDIUM Libtiff: libtiff: heap-buffer overflow via numeric truncation in the jpeg raw passthrough
CVE-2026-89298 4.9 MEDIUM Keycloak-services: keycloak-services: confidential client secret disclosed to view-clients
CVE-2026-88914 4.4 MEDIUM Gstreamer1-plugins-good: gstreamer: integer overflow and out-of-bounds read in qtdemux cea

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-61

V. Comments for CVE-2026-77159

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