What is CVE-2026-33711?

CVE-2026-33711 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10. CVE-2026-33711 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-33711?

CVE-2026-33711 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-33711?

No patch is currently available for CVE-2026-33711. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2026-33711 actively exploited?

CVE-2026-33711 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-33711

High

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.

Package Linux Kernel

Published 2026-03-26

Last modified 2026-03-30

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness type

CWE-61

CVE-2026-33711 is classified as CWE-61

See CWE-61 on MITRE CWE for full details on this weakness type.

References

The following references provide additional information about CVE-2026-33711 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

GitHub
https://github.com/lxc/incus/security/advisories/GHSA-q9vp-3wcg-8p4x

Exploit Vendor Advisory

Details

CVE ID CVE-2026-33711

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-03-26

Modified 2026-03-30

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2026-33711?

CVE-2026-33711 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . CVE-2026-33711 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-33711?

CVE-2026-33711 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-33711?

No patch is currently available for CVE-2026-33711. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2026-33711 actively exploited?

No — CVE-2026-33711 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.