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CVE-2026-33711— Incus vulnerable to local privilege escalation through VM screenshot path

Quick assessment

Affected
lxc incus
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.

Incus是LXC开源的一个系统容器和虚拟机管理器。 Incus 6.23.0之前版本存在安全漏洞，该漏洞源于使用可预测的临时文件路径，可能导致拒绝服务或本地权限提升。

AI Predicted 4.9 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1553.005 · Mark-of-the-Web Bypass
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I. Basic Information for CVE-2026-33711

Vulnerability Information
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Vulnerability Title
Incus vulnerable to local privilege escalation through VM screenshot path
Source: CVE Program / CVE List V5
Vulnerability Description
Incus is a system container and virtual machine manager. Incus provides an API to retrieve VM screenshots. That API relies on the use of a temporary file for QEMU to write the screenshot to which is then picked up and sent to the user prior to deletion. As versions prior to 6.23.0 use predictable paths under /tmp for this, an attacker with local access to the system can abuse this mechanism by creating their own symlinks ahead of time. On the vast majority of Linux systems, this will result in a "Permission denied" error when requesting a screenshot. That's because the Linux kernel has a security feature designed to block such attacks, `protected_symlinks`. On the rare systems with this purposefully disabled, it's then possible to trick Incus intro truncating and altering the mode and permissions of arbitrary files on the filesystem, leading to a potential denial of service or possible local privilege escalation. Version 6.23.0 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-61
Source: CVE Program / CVE List V5
Vulnerability Title
Incus 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Incus是LXC开源的一个系统容器和虚拟机管理器。 Incus 6.23.0之前版本存在安全漏洞，该漏洞源于使用可预测的临时文件路径，可能导致拒绝服务或本地权限提升。
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
lxc incus < 6.23.0 -

II. Public POCs for CVE-2026-33711

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III. Intelligence Information for CVE-2026-33711

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Vendor Advisories for CVE-2026-33711 (1)

Same Patch Batch · lxc · 2026-03-26 · 6 CVEs total

CVE-2026-33897 10.0 CRITICAL Incus vulnerable to arbitrary file read and write through pongo templates
CVE-2026-33945 10.0 CRITICAL Abitrary file write through systemd-creds option
CVE-2026-33898 8.8 HIGH Local Incus UI web server vulnerable to nuthentication bypass
CVE-2026-33743 6.5 MEDIUM Incus vulnerable to denial of source through crafted bucket backup file
CVE-2026-33542 Incus does not verify combined fingerprint when downloading images from simplestreams serv

IV. Related Vulnerabilities

Same product: incus
Same vendor: lxc
Same weakness: CWE-61

V. Comments for CVE-2026-33711

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