PT-2023-8000 · Linux+8 · Linux Kernel+8
Nassim Asrir
·
Published
2023-08-11
·
Updated
2026-04-09
·
CVE-2023-6546
CVSS v3.1
7.0
High
| Vector | AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
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. The exploit bypasses KASLR by leaking the kernel address from world-readable /sys/kernel/notes. To bypass SMAP, the author used a novel technique of filling the kernfs pr cont buf global variable with controlled data from userspace.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Race Condition
Use After Free
Time Of Check To Time Of Use
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Related Identifiers
Affected Products
Alt Linux
Almalinux
Astra Linux
Centos
Linux Kernel
Red Hat
Red Os
Rocky Linux
Suse