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An out-of-bounds read vulnerability was found in the NVMe-oF/TCP subsystem in the Linux kernel. This issue may allow a remote attacker to send a crafted TCP packet, triggering a heap-based buffer overflow that results in kmalloc data being printed and potentially leaked to the kernel ring buffer (dmesg).

CVE-2023-6121 is a medium-severity vulnerability affecting the NVMe over Fabrics over TCP (NVMe-oF/TCP) subsystem in the Linux kernel, specifically in Red Hat Enterprise Linux 8. The flaw is an out-of-bounds read triggered by a heap-based buffer overflow when processing crafted TCP packets. An attacker with network access and low privileges can exploit this by sending maliciously crafted TCP packets to a system running the vulnerable NVMe-oF/TCP kernel module. The overflow causes kernel heap memory (allocated by kmalloc) to be printed and potentially leaked into the kernel ring buffer, accessible via dmesg logs. This leakage can expose sensitive kernel memory contents, which may aid attackers in further attacks such as privilege escalation or bypassing kernel protections. The vulnerability does not directly impact system availability or integrity and does not require user interaction. The CVSS vector (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N) indicates network attack vector, low attack complexity, requires low privileges, no user interaction, unchanged scope, and limited confidentiality impact. No public exploits or active exploitation have been reported, but the vulnerability is publicly disclosed and should be addressed promptly. The absence of patch links suggests that users should monitor Red Hat advisories for updates. This vulnerability is particularly relevant for environments using NVMe-oF/TCP for storage networking, which is common in enterprise data centers and cloud infrastructures.

Detailed information about CVE-2023-6121: Out-of-bounds Read in Red Hat Red Hat Enterprise Linux 8 affecting Red Hat Red Hat Enterprise Linux 8. Get real-time u

CVE-2023-6121: Out-of-bounds Read in Red Hat Red Hat Enterprise Linux 8 - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2023-6121: Out-of-bounds Read in Red Hat Red Hat Enterprise Linux 8

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