In the Linux kernel, the following vulnerability has been resolved:
eventfs: Fix use-after-free in eventfs_remove_rec()
eventfs_remove_rec() recursively removes the child at the current loop
position. After the recursive call returns, list_for_each_entry() advances
by reading list.next from the removed child. If free_ei() drops the final reference, release_ei() reuses the list/rcu
union to queue an SRCU callback.
The child may be freed before that read. The eventfs_mutex serializes list updates, but it does not keep the removed
child alive or prevent the SRCU callback from running. Use list_for_each_entry_safe() to save the next sibling before recursively
removing the current child.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
References 5
https://git.kernel.org/stable/c/5635211b44969f4816e29ec4d5f8665fb39535d0
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/74bb1eaf72d185a78c879eb2678ea500f82f46a8
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/b77581b25e213e83b79ce11eb30024e55ceeb3e9
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/f161d7861a0bfdf10af6b738b3b57636204661fb
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/fd73b691702170d37d66f4b0278530cea8ed419a
416baaa9-dc9f-4396-8d5f-8c081fb06d67