In the Linux kernel, the following vulnerability has been resolved: fsverity: RCU-delay the…

Why it is Yellow

• CVSS 7.8 high
• On your watchlist: linux kernel

References

• https://git.kernel.org/stable/c/e58c3805ed325fe2d4ae2dd467c0486cc860b733
• https://git.kernel.org/stable/c/fa84f091a8e7fc46fd29834496fab9739dd4c8dc

Original description

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.