Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: configfs: fix a race in configfs_{,un}register_subsystem() When configfs_register_subsystem() or configfs_unregister_subsystem() is executing link_group() or unlink_group(), it is possible that two processes add or delete list concurrently. Some unfortunate interleavings of them can cause kernel panic. One of cases is: A --> B --> C --> D A <-- B <-- C <-- D delete list_head *B | delete list_head *C --------------------------------|----------------------------------- configfs_unregister_subsystem | configfs_unregister_subsystem unlink_group | unlink_group unlink_obj | unlink_obj list_del_init | list_del_init __list_del_entry | __list_del_entry __list_del | __list_del // next == C | next->prev = prev | | next->prev = prev prev->next = next | | // prev == B | prev->next = next Fix this by adding mutex when calling link_group() or unlink_group(), but parent configfs_subsystem is NULL when config_item is root. So I create a mutex configfs_subsystem_mutex.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 7063fbf2261194f72ee75afca67b3b38b554b5fa before 40805099af11f68c5ca7dbcfacf455da8f99f622; affected 7063fbf2261194f72ee75afca67b3b38b554b5fa before d1654de19d42f513b6cfe955cc77e7f427e05a77; affected 7063fbf2261194f72ee75afca67b3b38b554b5fa before a37024f7757c25550accdebf49e497ad6ae239fe; affected 7063fbf2261194f72ee75afca67b3b38b554b5fa before b7e2b91fcb5c78c414e33dc8d50642e307ca0c5a; affected 7063fbf2261194f72ee75afca67b3b38b554b5fa before a7ab53d3c27dfe83bb594456b9f38a37796ec39b; affected 7063fbf2261194f72ee75afca67b3b38b554b5fa before e7a66dd2687758718eddd79b542a95cf3aa488cc; affected 7063fbf2261194f72ee75afca67b3b38b554b5fa before 3aadfd46858b1f64d4d6a0654b863e21aabff975; affected 7063fbf2261194f72ee75afca67b3b38b554b5fa before 84ec758fb2daa236026506868c8796b0500c047d |
| Linux / Linux | affected 2.6.16; unaffected 0 before 2.6.16; unaffected 4.9.304 through 4.9.*; unaffected 4.14.269 through 4.14.*; unaffected 4.19.232 through 4.19.*; unaffected 5.4.182 through 5.4.*; unaffected 5.10.103 through 5.10.*; unaffected 5.15.26 through 5.15.*; unaffected 5.16.12 through 5.16.*; unaffected 5.17 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/40805099af11f68c5ca7dbcfacf455da8f99f622
- https://git.kernel.org/stable/c/d1654de19d42f513b6cfe955cc77e7f427e05a77
- https://git.kernel.org/stable/c/a37024f7757c25550accdebf49e497ad6ae239fe
- https://git.kernel.org/stable/c/b7e2b91fcb5c78c414e33dc8d50642e307ca0c5a
- https://git.kernel.org/stable/c/a7ab53d3c27dfe83bb594456b9f38a37796ec39b
- https://git.kernel.org/stable/c/e7a66dd2687758718eddd79b542a95cf3aa488cc
- https://git.kernel.org/stable/c/3aadfd46858b1f64d4d6a0654b863e21aabff975
- https://git.kernel.org/stable/c/84ec758fb2daa236026506868c8796b0500c047d
ADP enrichment
No English description supplied.
No references supplied.