CVE-2022-50886
Description
A flaw was found in the Linux kernel's Toshiba SD/MMC card reader driver (toshsd). The driver fails to check the return value of mmc_add_host(). If this function fails, memory allocated by mmc_alloc_host() is leaked, and a subsequent driver removal attempt will crash the kernel by trying to delete a device that was never added.
Statement
This flaw affects systems with Toshiba SD/MMC card readers using the toshsd driver. The issue only manifests when mmc_add_host() fails during driver initialization, which is an uncommon error condition. The practical security impact is limited as it requires both specific hardware and an initialization failure to trigger.
Mitigation
To mitigate this issue, prevent the toshsd module from being loaded. See https://access.redhat.com/solutions/41278 for instructions.
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 | 3.3 | 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 | Low | 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:L
Understanding the Weakness (CWE)
Availability,Integrity
Technical Impact: Unexpected State; DoS: Crash, Exit, or Restart
An unexpected return value could place the system in a state that could lead to a crash or other unintended behaviors.
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