CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
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.
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
ubuntu | 18.04 | noarch | linux | < any | UNKNOWN |
ubuntu | 20.04 | noarch | linux | < any | UNKNOWN |
ubuntu | 18.04 | noarch | linux-aws | < any | UNKNOWN |
ubuntu | 20.04 | noarch | linux-aws | < any | UNKNOWN |
ubuntu | 18.04 | noarch | linux-aws-5.4 | < any | UNKNOWN |
ubuntu | 16.04 | noarch | linux-aws-hwe | < any | UNKNOWN |
ubuntu | 20.04 | noarch | linux-azure | < any | UNKNOWN |
ubuntu | 14.04 | noarch | linux-azure | < any | UNKNOWN |
ubuntu | 16.04 | noarch | linux-azure | < any | UNKNOWN |
ubuntu | 18.04 | noarch | linux-azure-4.15 | < any | UNKNOWN |
git.kernel.org/linus/84ec758fb2daa236026506868c8796b0500c047d (5.17-rc6)
git.kernel.org/stable/c/3aadfd46858b1f64d4d6a0654b863e21aabff975
git.kernel.org/stable/c/40805099af11f68c5ca7dbcfacf455da8f99f622
git.kernel.org/stable/c/84ec758fb2daa236026506868c8796b0500c047d
git.kernel.org/stable/c/a37024f7757c25550accdebf49e497ad6ae239fe
git.kernel.org/stable/c/a7ab53d3c27dfe83bb594456b9f38a37796ec39b
git.kernel.org/stable/c/b7e2b91fcb5c78c414e33dc8d50642e307ca0c5a
git.kernel.org/stable/c/d1654de19d42f513b6cfe955cc77e7f427e05a77
git.kernel.org/stable/c/e7a66dd2687758718eddd79b542a95cf3aa488cc
launchpad.net/bugs/cve/CVE-2022-48931
nvd.nist.gov/vuln/detail/CVE-2022-48931
security-tracker.debian.org/tracker/CVE-2022-48931
www.cve.org/CVERecord?id=CVE-2022-48931