CVSS 3.1
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
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: fsverity: RCU-delay the freeing of struct fsverity_info __fsverity_get_info() calls rhashtable_lookup_fast(), which just uses rcu_read_lock() and doesn't directly synchronize with fsverity_remove_info(). For the same inode this isn't a problem: its fsverity_info is removed only at inode eviction time or upon failure to enable verity, when the inode no longer needs its fsverity_info and it will no longer be accessed via that inode. However, this is broken and can cause a use-after-free for concurrent __fsverity_get_info() for *different* inodes. Those rely on following fsverity_info::rhash_head in the rhashtable under rcu_read_lock() only. They also use fsverity_info::inode to do the key comparison. Fix this by RCU-delaying the freeing of 'struct fsverity_info' after it's been removed from the rhashtable.
Засегнати продукти
- Linux Linux: f77f281b61183a5c0b87e6a4d101c70bd32c1c79 преди fa84f091a8e7fc46fd29834496fab9739dd4c8dc; f77f281b61183a5c0b87e6a4d101c70bd32c1c79 преди e58c3805ed325fe2d4ae2dd467c0486cc860b733
- Linux Linux: 7.0; преди 7.0; 7.2.11 до 7.2.*; от 7.3 нататък
История
- 23 октомври 2026 Публикувано