Description
In the Linux kernel, the following vulnerability has been resolved: fsnotify: Fix ordering of iput() and watched_objects decrement Ensure the superblock is kept alive until we're done with iput(). Holding a reference to an inode is not allowed unless we ensure the superblock stays alive, which fsnotify does by keeping the watched_objects count elevated, so iput() must happen before the watched_objects decrement. This can lead to a UAF of something like sb->s_fs_info in tmpfs, but the UAF is hard to hit because race orderings that oops are more likely, thanks to the CHECK_DATA_CORRUPTION() block in generic_shutdown_super(). Also, ensure that fsnotify_put_sb_watched_objects() doesn't call fsnotify_sb_watched_objects() on a superblock that may have already been freed, which would cause a UAF read of sb->s_fsnotify_info.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
d2f277e26f521ccf6fb438463b41dba6123caabe to < 45a8f8232a495221ed058191629f5c628f21601aaffectedd2f277e26f521ccf6fb438463b41dba6123caabe to < 83af1cfa10d9aafdabd06b3655e07727f373b434affectedd2f277e26f521ccf6fb438463b41dba6123caabe to < 21d1b618b6b9da46c5116c640ac4b1cc8d40d63aaffected
Linux Linux
Default version status: affected
6.10affected0 to < 6.10unaffected6.11.11 to ≤ 6.11.*unaffected6.12.2 to ≤ 6.12.*unaffected6.13 to ≤ *unaffected