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An array indexing vulnerability was found in the netfilter subsystem of the Linux kernel. A missing macro could lead to a miscalculation of the `h->nets` array offset, providing attackers with the primitive to arbitrarily increment/decrement a memory buffer out-of-bound. This issue may allow a local user to crash the system or potentially escalate their privileges on the system.

CVE-2023-42753 is an out-of-bounds write vulnerability discovered in the netfilter subsystem of the Linux kernel, specifically affecting Red Hat Enterprise Linux 7. The root cause is a missing macro that leads to an incorrect calculation of the offset into the `h->nets` array. This miscalculation allows a local attacker to increment or decrement memory buffer indices beyond their intended bounds, resulting in an out-of-bounds write condition. Such memory corruption can cause system instability, crashes (denial of service), or potentially enable privilege escalation by corrupting kernel memory structures. The vulnerability requires local access with at least low privileges, and the attack complexity is high due to the need to precisely manipulate kernel memory. No user interaction is needed, and the scope is limited to the local system. The CVSS v3.1 score is 7.0, reflecting high impact on confidentiality, integrity, and availability. Although no known exploits have been reported in the wild, the vulnerability poses a significant risk to systems running RHEL 7, especially those with multiple users or exposed local access. The netfilter subsystem is critical for network packet filtering and firewall functionality, making this vulnerability relevant for systems that rely on Linux kernel networking features.

Detailed information about CVE-2023-42753: Out-of-bounds Write in Red Hat Red Hat Enterprise Linux 7 affecting Red Hat Red Hat Enterprise Linux 7. Get real-time

CVE-2023-42753: Out-of-bounds Write in Red Hat Red Hat Enterprise Linux 7 - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2023-42753: Out-of-bounds Write in Red Hat Red Hat Enterprise Linux 7

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