CVE-2019-16229
Description
A NULL pointer dereference flaw was found in kfd_interrupt_init in drivers/gpu/drm/amd/amdkfd/kfd_interrupt.c in AMD GPU driver. Here a call to alloc_workqueue return was not validated and can cause a denial of service at the time of failure. This could allow an attacker to crash the system or leak kernel internal information.
Mitigation
Mitigation for this issue is either not available or the currently available options don't 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 | 4.1 | 4.1 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | High | High | N/A |
| Privileges Required | High | High | 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:H/PR:H/UI:N/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Red Hat CVSS v3 Score Explanation
This flaw exploitation will need some per-conditions,
That is there should be a memory pressure in kernel space which will cause 'kzalloc' to fail and in turn 'alloc_workqueue' will fail , making 'AC:H'.
Attacker will have to access the shell and should have atleast a local account. 'AV:L'
Attacker should have an access privilege , a special user (or a root) to exploit , 'PR:H' the gpu graphics.
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