Race condition in Linux kernel tty driver

1) Race condition

EUVDB-ID: #VU91466

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-52872

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a race condition within the gsm_modem_upd_via_msc() function in drivers/tty/n_gsm.c. A local user can escalate privileges on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.15 - 6.7 rc7

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:5.15:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.15:rc1:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.15:rc2:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.15:rc3:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.15:rc4:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.15:rc5:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.15:rc6:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.15:rc7:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.15.0:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.15.1:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/81a4dd5e6c78f5d8952fa8c9d36565db1fe01444
https://git.kernel.org/stable/c/df6cfab66ff2a44bd23ad5dd5309cb3421bb6593
https://git.kernel.org/stable/c/19d34b73234af542cc8a218cf398dee73cdb1890
https://git.kernel.org/stable/c/ce4df90333c4fe65acb8b5089fdfe9b955ce976a
https://git.kernel.org/stable/c/3a75b205de43365f80a33b98ec9289785da56243
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.138
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.62
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.5.11
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.1
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.7

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.