Description
In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: fix UAF in __blkcg_rstat_flush() When multiple blkgs in the same blkcg are released concurrently, a use-after-free can occur. The race happens when one blkg's __blkcg_rstat_flush() removes another blkg's iostat entries via llist_del_all(). The second blkg sees an empty list and proceeds to free itself while the first is still iterating over its entries. Move the flush from __blkg_release() (RCU callback) to blkg_release() (before call_rcu). This ensures the RCU grace period waits for any concurrent flush's rcu_read_lock() section to complete before freeing.
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
20cb1c2fb7568a6054c55defe044311397e01ddb to < 96e545410c4f74c89d496c1d5d9ef8d08f14368baffected20cb1c2fb7568a6054c55defe044311397e01ddb to < bbebd9425cad3573d1527441753899b926525a0faffected20cb1c2fb7568a6054c55defe044311397e01ddb to < 5e5b7f2ef854936e95dceb6a2fdfefcb7152d2c6affected20cb1c2fb7568a6054c55defe044311397e01ddb to < afebe44facc48a61761e885bbb7f0380d4a603ecaffected20cb1c2fb7568a6054c55defe044311397e01ddb to < 0ab5ee5a1badb58cbb2242617cb01a4972b1f2a2affected0f6090d90f627d8c58f939067d6c6821ce1b3c68affected6.3.9 to < 6.4affected
Linux Linux
Default version status: affected
6.4affected0 to < 6.4unaffected6.6.144 to ≤ 6.6.*unaffected6.12.95 to ≤ 6.12.*unaffected6.18.38 to ≤ 6.18.*unaffected7.1.3 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/96e545410c4f74c89d496c1d5d9ef8d08f14368b ↗
- https://git.kernel.org/stable/c/bbebd9425cad3573d1527441753899b926525a0f ↗
- https://git.kernel.org/stable/c/5e5b7f2ef854936e95dceb6a2fdfefcb7152d2c6 ↗
- https://git.kernel.org/stable/c/afebe44facc48a61761e885bbb7f0380d4a603ec ↗
- https://git.kernel.org/stable/c/0ab5ee5a1badb58cbb2242617cb01a4972b1f2a2 ↗