#VU85891 Race condition in Linux kernel - CVE-2023-6200

Vulnerability identifier: #VU85891

Vulnerability risk: Medium

CVSSv4.0: 6.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-6200

CWE-ID: CWE-362

Exploitation vector: Local 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 within the ndisc_router_discovery() function when handling ICMPv6 router advertisement packets. A remote attacker on the local network can send specially crafted ICMPv6 router advertisement packets, trigger a use-after-free error and execute arbitrary code on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: before 6.7, 6.7

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External links
https://bugzilla.redhat.com/show_bug.cgi?id=2250377
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dade3f6a1e4e
https://www.zerodayinitiative.com/advisories/ZDI-24-842/

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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 local network (LAN).

Is there known malware, which exploits this vulnerability?

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