CVE-2023-53547
Description
An invalid pointer dereference flaw was found in the Linux kernel AMD GPU SDMA v4 driver's cleanup code. On systems with SDMA 4.2.2 hardware, driver unload or system shutdown triggers the sdma_v4_0_sw_fini() cleanup path, which attempts to release firmware using an uninitialized or corrupted pointer, causing a general protection fault with a non-canonical address and denial of service through kernel crash.
Statement
For SDMA 4.2.2 hardware, sdma_v4_0_sw_fini() fails to properly handle firmware context cleanup. During driver finalization, the code calls amdgpu_sdma_destroy_inst_ctx() which attempts to release firmware via amdgpu_ucode_release(). The firmware pointer appears to be uninitialized or corrupted, causing free_fw_priv() to dereference an invalid address (0xd5e5a4ae79d24a32).
Mitigation
To mitigate this issue, prevent the amdgpu module from loading. See https://access.redhat.com/solutions/41278 for instructions on blacklisting kernel modules.
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).
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,Integrity
Technical Impact: DoS: Crash, Exit, or Restart
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