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CVE-2025-71074: Linux

7.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: functionfs: fix the open/removal races ffs_epfile_open() can race with removal, ending up with file->private_data pointing to freed object. There is a total count of opened files on functionfs (both ep0 and dynamic ones) and when it hits zero, dynamic files get removed. Unfortunately, that removal can happen while another thread is in ffs_epfile_open(), but has not incremented the count yet. In that case open will succeed, leaving us with UAF on any subsequent read() or write(). The root cause is that ffs->opened is misused; atomic_dec_and_test() vs. atomic_add_return() is not a good idea, when object remains visible all along. To untangle that * serialize openers on ffs->mutex (both for ep0 and for dynamic files) * have dynamic ones use atomic_inc_not_zero() and fail if we had zero ->opened; in that case the file we are opening is doomed. * have the inodes of dynamic files marked on removal (from the callback of simple_recursive_removal()) - clear ->i_private there. * have open of dynamic ones verify they hadn't been already removed, along with checking that state is FFS_ACTIVE.

    Засегнати продукти

    • Linux Linux: ddf8abd2599491cbad959c700b90ba72a5dce8d0 преди e002b3c1e6a0faa53329ef0d21e6351bcece6edb; ddf8abd2599491cbad959c700b90ba72a5dce8d0 преди 585a656283c954337036422afcd9cb70dd4135e7; ddf8abd2599491cbad959c700b90ba72a5dce8d0 преди 75240e5e51c6e6d67a3039384125fa54259a3926; ddf8abd2599491cbad959c700b90ba72a5dce8d0 преди e5bf5ee266633cb18fff6f98f0b7d59a62819eee
    • Linux Linux: 2.6.35; преди 2.6.35; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.114 до 6.12.*; 6.19 до *

    История

    • 13 януари 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2025-71074: Linux | freedomonline.bg