CVE-2026-43287
Description
A flaw was found in the Linux kernel. An unprivileged local user can exploit a vulnerability in the DRM_IOCTL_MODE_CREATEPROPBLOB function, which allows for the allocation of arbitrary-sized property blobs in kernel memory. This memory is not properly accounted for, leading to unbounded kernel memory consumption and potentially causing a system-wide Out Of Memory (OOM) condition, resulting in a Denial of Service (DoS).
Statement
DRM_IOCTL_MODE_CREATEPROPBLOB allowed userspace to allocate arbitrary sized property blob data backed by kernel memory, but the allocation was not charged to the caller memcg. A local unprivileged process with access to a DRM device could repeatedly create large blobs and bypass cgroup memory limits, causing uncontrolled kernel memory growth and possible system-wide OOM. For the CVSS the PR:L is used because exploitation requires local code execution and permission to access the DRM ioctl interface, while no network path is involved. The issue is not memory corruption and does not indicate information disclosure or privilege escalation. Impact is availability only through kernel memory exhaustion.
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 | 5.5 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD: 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: Crash, Exit, or Restart; DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other)
If an attacker can trigger the allocation of the limited resources, but the number or size of the resources is not controlled, then the most common result is denial of service. This would prevent valid users from accessing the product, and it could potentially have an impact on the surrounding environment, i.e., the product may slow down, crash due to unhandled errors, or lock out legitimate users. For example, a memory exhaustion attack against an application could slow down the application as well as its host operating system.
Access Control,Other
Technical Impact: Bypass Protection Mechanism; Other
In some cases it may be possible to force the product to "fail open" in the event of resource exhaustion. The state of the product -- and possibly the security functionality - may then be compromised.
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