FKIE_CVE-2025-38579

Vulnerability from fkie_nvd - Published: 2025-08-19 17:15 - Updated: 2026-01-09 13:57
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/01b6f5955e0008af6bc3a181310d2744bb349800Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/08e8ab00a6d20d5544c932ee85a297d833895141Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/154467f4ad033473e5c903a03e7b9bca7df9a0faPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/44a79437309e0ee2276ac17aaedc71253af253a8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cc1615d5aba4f396cf412579928539a2b124c8a0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dabfa3952c8e6bfe6414dbf32e8b6c5f349dc898Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e68b751ec2b15d866967812c57cfdfc1eba6a269Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlThird Party Advisory, Mailing List
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
debian debian_linux 11.0
To clipboard 

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix KMSAN uninit-value in extent_info usage\n\nKMSAN reported a use of uninitialized value in `__is_extent_mergeable()`\n and `__is_back_mergeable()` via the read extent tree path.\n\nThe root cause is that `get_read_extent_info()` only initializes three\nfields (`fofs`, `blk`, `len`) of `struct extent_info`, leaving the\nremaining fields uninitialized. This leads to undefined behavior\nwhen those fields are accessed later, especially during\nextent merging.\n\nFix it by zero-initializing the `extent_info` struct before population."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: f2fs: correcci\u00f3n del valor no inicializado de KMSAN en el uso de extent_info. KMSAN inform\u00f3 del uso de un valor no inicializado en `__is_extent_mergeable()` y `__is_back_mergeable()` mediante la ruta de lectura del \u00e1rbol de extensiones. La causa principal es que `get_read_extent_info()` solo inicializa tres campos (`fofs`, `blk`, `len`) de `struct extent_info`, dejando los campos restantes sin inicializar. Esto provoca un comportamiento indefinido al acceder a dichos campos posteriormente, especialmente durante la fusi\u00f3n de extensiones. Para solucionarlo, inicialice a cero la estructura `extent_info` antes de rellenarla."
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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