#VU80494 Race condition in Linux kernel - CVE-2023-32257

Vulnerability identifier: #VU80494

Vulnerability risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2023-32257

CWE-ID: CWE-362

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to a race condition when handling SMB2_SESSION_SETUP and SMB2_LOGOFF commands. A remote attacker can send specially crafted data to the affected server, trigger a race condition and execute arbitrary code on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: All versions

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External links
https://bugzilla.redhat.com/show_bug.cgi?id=2219806
https://github.com/torvalds/linux/commit/f5c779b7ddbda30866cf2a27c63e34158f858c73
https://www.zerodayinitiative.com/advisories/ZDI-23-705/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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