#VU77908 Use-after-free in Linux kernel - CVE-2023-3439

Vulnerability identifier: #VU77908

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-3439

CWE-ID: CWE-416

Exploitation vector: Local

Exploit availability: No

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

Vendor: Linux Foundation

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error within the mctp_unregister() function in the MCTP protocol in the Linux kernel. A local user can trigger a use-after-free error and crash the kernel.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: All versions

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External links
https://github.com/torvalds/linux/commit/b561275d633bcd8e0e8055ab86f1a13df75a0269
https://bugzilla.redhat.com/show_bug.cgi?id=2217915
https://www.openwall.com/lists/oss-security/2023/07/02/1

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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.