CVE-2025-40340
Description
A NULL pointer dereference flaw was found in the Linux kernel's Intel Xe GPU driver. In xe_gem_fault(), after a device hotplug unbind-rebind cycle, a race condition can occur where a process has memory mapped but the TTM buffer object's resource pointer becomes NULL. When the fault handler attempts to check the memory type via mem_type_is_vram(tbo->resource->mem_type), it dereferences the NULL pointer, causing a kernel panic. A local user could potentially trigger this through GPU hotplug operations.
Statement
This vulnerability affects systems with Intel discrete GPUs using the Xe driver. The issue manifests during device hotplug operations and requires specific timing conditions. Exploitation leads to a kernel crash and denial of service.
Mitigation
To mitigate this issue, prevent the xe module from being loaded if Intel discrete GPU functionality is not required. See https://access.redhat.com/solutions/41278 for instructions on how to blacklist a kernel module.
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 | 5.8 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | High | 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 | Low | N/A | N/A |
| Integrity Impact | Low | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
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