Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

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.

在 libvirt 的 函数中发现了一个符号链接跟随（symlink-following）漏洞。该函数在对 swtpm 日志文件执行基于路径的 操作时，未检查该文件是否为符号链接。因此，拥有 swtpm 账户访问权限的本地攻击者可以将该日志文件替换为一个符号链接，从而让以 root 身份运行的 libvirtd 将任意文件的所有权转移给 swtpm 用户。

CVSS 5.5 · Medium

Possible ATT&CK Techniques 1 AI

T1308
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-77159

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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

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

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-77159

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-77159 (1)

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

Other References for CVE-2026-77159 (1)

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

CVE-2026-89060 7.7 HIGH Stolostron/multicluster-observability-addon: cross-namespace secret disclosure in multiclu
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

No comments yet

Leave a comment