CVE-2022-48931

Technical 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 |

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References