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CVE-2022-48931
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CVE-2022-48931
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
Description
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.
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General Information
Vendors
- linux
Products
- linux kernel
References
Miscellaneous
Additional Info
Technical Analysis
Report as Emergent Threat Response
Report as Exploited in the Wild
CVE ID
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