CVE-2026-68241
Description
A flaw was found in the Linux kernel's DisplayPort Multi-Stream Transport (MST) subsystem. An unbounded loop in the intel_dp_check_mst_status() function, responsible for servicing interrupts from a sink device, can lead to a system becoming unresponsive. A malicious or faulty DisplayPort MST sink device could exploit this to trigger a Denial of Service (DoS) condition.
Statement
This issue affects systems using Intel i915 DisplayPort MST. intel_dp_check_mst_status() could loop indefinitely servicing sink interrupts from a stuck device, causing soft lockup. Systems without Intel graphics or DP MST are not affected.
Mitigation
To mitigate this issue, prevent the i915 module from loading. See https://access.redhat.com/solutions/41278 for instructions.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Amplification
An infinite loop will cause unexpected consumption of resources, such as CPU cycles or memory. The software's operation may slow down, or cause a long time to respond.
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