#VU82305 Out-of-bounds read in Linux kernel - CVE-2023-42755

Vulnerability identifier: #VU82305

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-2023-42755

CWE-ID: CWE-125

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 denial of service (DoS) attack.

The vulnerability exists due to a boundary condition within the the IPv4 Resource Reservation Protocol (RSVP) classifier function in the Linux kernel. A local user can trigger an out-of-bounds read error and crash the Linux kernel.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: before 6.3, 6.3

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External links
http://access.redhat.com/security/cve/CVE-2023-42755
http://bugzilla.redhat.com/show_bug.cgi?id=2239847
http://seclists.org/oss-sec/2023/q3/229
http://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
http://www.zerodayinitiative.com/advisories/ZDI-24-591/

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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.