CVE-2026-80594
Description
A flaw was found in the Linux kernel's ims-pcu driver. This vulnerability allows a malicious device to trigger an infinite loop by providing a specially crafted descriptor with a zero-length field during the parsing of CDC union descriptors. This can lead to a Denial of Service (DoS) condition, making the system unresponsive.
Statement
A moderate severity flaw was found in the Linux kernel ims-pcu driver. When parsing CDC union descriptors in ims_pcu_get_cdc_union_desc(), the driver iterates through the extra descriptor data without verifying that the bLength of each descriptor is at least 2. A malicious USB device connected to the system could supply a descriptor with bLength = 0, causing an infinite loop in the driver during parsing. This results in a denial of service, leaving the system unresponsive. The vulnerability affects only availability; there is no impact on confidentiality or integrity, and exploiting it requires connecting a specially crafted USB device. All Red Hat products in scope for this flaw, Red Hat Enterprise Linux 6 through 10 (kernel and kernel-rt) and Red Hat In-Vehicle OS kernels, are not affected because the vulnerable code is not present in the shipped kernels.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
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)
Frequently Asked Questions
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