CVE-2024-35974 Information

Description

In the Linux kernel the following vulnerability has been resolved:

block: fix q->blkg_list corruption during disk rebind

Multiple gendisk instances can allocated/added for single request queue in case of disk rebind. blkg may still stay in q->blkg_list when calling blkcg_init_disk() for rebind then q->blkg_list becomes corrupted.

Fix the list corruption issue by:

• add blkg_init_queue() to initialize q->blkg_list & q->blkcg_mutex only
• move calling blkg_init_queue() into blk_alloc_queue()

The list corruption should be started since commit f1c006f1c685 (lk-cgroup: synchronize pd_free_fn() from blkg_free_workfn() and blkcg_deactivate_policy()) which delays removing blkg from q->blkg_list into blkg_free_workfn().

Reference

https://git.kernel.org/stable/c/740ffad95ca8033bd6e080ed337655b13b4d38ac https://git.kernel.org/stable/c/858c489d81d659af17a4d11cfaad2afb42e47a76 https://git.kernel.org/stable/c/8b8ace080319a866f5dfe9da8e665ae51d971c54