CVE-2022-50769
Unknown Unknown - Not Provided
Memory Leak and Kernel Crash in Linux mxcmmc Driver Due to Improper Error Handling

Publication date: 2025-12-24

Last updated on: 2025-12-24

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: mmc: mxcmmc: fix return value check of mmc_add_host() mmc_add_host() may return error, if we ignore its return value, the memory that allocated in mmc_alloc_host() will be leaked and it will lead a kernel crash because of deleting not added device in the remove path. So fix this by checking the return value and goto error path which will call mmc_free_host().
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Meta Information
Published
2025-12-24
Last Modified
2025-12-24
Generated
2026-06-16
AI Q&A
2025-12-24
EPSS Evaluated
2026-06-15
NVD
CVE-2022-50769
EUVD
EUVD-2022-55792
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability occurs in the Linux kernel's mmc subsystem, specifically in the mxcmmc driver. The function mmc_add_host() may return an error, but if its return value is ignored, the memory allocated by mmc_alloc_host() is leaked. This memory leak can lead to a kernel crash because the system attempts to delete a device that was never successfully added during the remove path. The fix involves properly checking the return value of mmc_add_host() and, on error, freeing the allocated memory to prevent the crash.

Impact Analysis

This vulnerability can cause a kernel crash due to memory leaks and improper device removal handling. Such crashes can lead to system instability, downtime, and potential loss of data or service availability on affected Linux systems using the vulnerable mmc driver.

Mitigation Strategies

To mitigate this vulnerability, update your Linux kernel to a version that includes the fix for the mmc_add_host() return value check in the mxcmmc driver. This ensures that memory leaks and potential kernel crashes caused by ignoring the return value are prevented.

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