CVE-2025-38579 (GCVE-0-2025-38579)
Vulnerability from cvelistv5
Published
2025-08-19 17:03
Modified
2025-11-03 17:40
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix KMSAN uninit-value in extent_info usage KMSAN reported a use of uninitialized value in `__is_extent_mergeable()` and `__is_back_mergeable()` via the read extent tree path. The root cause is that `get_read_extent_info()` only initializes three fields (`fofs`, `blk`, `len`) of `struct extent_info`, leaving the remaining fields uninitialized. This leads to undefined behavior when those fields are accessed later, especially during extent merging. Fix it by zero-initializing the `extent_info` struct before population.
References
Impacted products
Vendor Product Version
Linux Linux Version: 94afd6d6e5253179c9b891d02081cc8355a11768
Version: 94afd6d6e5253179c9b891d02081cc8355a11768
Version: 94afd6d6e5253179c9b891d02081cc8355a11768
Version: 94afd6d6e5253179c9b891d02081cc8355a11768
Version: 94afd6d6e5253179c9b891d02081cc8355a11768
Version: 94afd6d6e5253179c9b891d02081cc8355a11768
Version: 94afd6d6e5253179c9b891d02081cc8355a11768
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