Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f77f281b61183a5c0b87e6a4d101c70bd32c1c79 before fa84f091a8e7fc46fd29834496fab9739dd4c8dc; affected f77f281b61183a5c0b87e6a4d101c70bd32c1c79 before e58c3805ed325fe2d4ae2dd467c0486cc860b733 |
| Linux / Linux | affected 7.0; unaffected 0 before 7.0; unaffected 7.2.11 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.