PT-2023-3674 · Linux+6 · Linux Kernel+6
Xingyuan Mo
·
Published
2023-04-12
·
Updated
2024-11-21
·
CVE-2023-38409
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel versions prior to 6.2.12
Description
The issue is related to the use of memory after it has been freed in the set con2fb map() function in the Linux kernel. This can lead to a denial of service. The problem arises because an assignment occurs only for the first vc, causing the fbcon registered fb and fbcon display arrays to become desynchronized in fbcon mode deleted, as the con2fb map points to the old fb info.
Recommendations
For Linux kernel versions prior to 6.2.12, update to version 6.2.12 or later to resolve the issue.
As a temporary workaround, consider restricting access to the set con2fb map() function in the fbcon.c module until a patch is available.
Fix
Race Condition
Use After Free
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Related Identifiers
Affected Products
Alt Linux
Almalinux
Centos
Linux Kernel
Red Hat
Rocky Linux
Suse