Description
In the Linux kernel, the following vulnerability has been resolved:
s390/dcssblk: fix kernel crash with list_add corruption
Commit fb08a1908cb1 ("dax: simplify the dax_device <-> gendisk association") introduced new logic for gendisk association, requiring drivers to explicitly call dax_add_host() and dax_remove_host().
For dcssblk driver, some dax_remove_host() calls were missing, e.g. in device remove path. The commit also broke error handling for out_dax case in device add path, resulting in an extra put_device() w/o the previous get_device() in that case.
This lead to stale xarray entries after device add / remove cycles. In the case when a previously used struct gendisk pointer (xarray index) would be used again, because blk_alloc_disk() happened to return such a pointer, the xa_insert() in dax_add_host() would fail and go to out_dax, doing the extra put_device() in the error path. In combination with an already flawed error handling in dcssblk (device_register() cleanup), which needs to be addressed in a separate patch, this resulted in a missing device_del() / klist_del(), and eventually in the kernel crash with list_add corruption on a subsequent device_add() / klist_add().
Fix this by adding the missing dax_remove_host() calls, and also move the put_device() in the error path to restore the previous logic.
Metrics
No CVSS score has been published yet.
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= fb08a1908cb119a4585611d91461ab6d27756b14, < 6489ec0107860345bc57dcde39e63dfb05ac5c11; >= fb08a1908cb119a4585611d91461ab6d27756b14, < b7ad75c77349beb4983b9f27108d9b3f33ae1413; >= fb08a1908cb119a4585611d91461ab6d27756b14, < b5c531a9a7d8e047c90c909f09cef06a9f8e62f4; >= fb08a1908cb119a4585611d91461ab6d27756b14, < c8f40a0bccefd613748d080147469a4652d6e74c |
| Linux | Linux | 5.17 |
References
Timeline
- Published
- Dec 24, 2025
- Last modified
- Jun 17, 2026
- NVD status
- Deferred