CVE-2024-35974

2024-05-2010:15:12

416baaa9-dc9f-4396-8d5f-8c081fb06d67

web.nvd.nist.gov

linux kernel

block vulnerability

list corruption fix

disk rebind

blkcg_init_disk

blkg_init_queue.

6.7 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

15.6%

JSON

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 (“blk-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().