CVE-2023-6546

2023-12-2114:01:28

redhat.com

access.redhat.com

cve-2023-6546

race condition

gsm 0710

linux kernel

use-after-free

privilege escalation

kernel module

blacklist.

7 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

7.2 High

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

10.2%

JSON

A race condition was found in the GSM 0710 tty multiplexor in the Linux kernel. This issue occurs when two threads execute the GSMIOC_SETCONF ioctl on the same tty file descriptor with the gsm line discipline enabled, and can lead to a use-after-free problem on a struct gsm_dlci while restarting the gsm mux. This could allow a local unprivileged user to escalate their privileges on the system.

Mitigation

This flaw can be mitigated by preventing the affected n_gsm kernel module from being loaded. For instructions on how to blacklist a kernel module, please see <https://access.redhat.com/solutions/41278>.