{"id":"CVE-2023-6121","title":"An out-of-bounds read vulnerability was found in the NVMe-oF/TCP subsystem in the Linux kernel","summary":"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 bei…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","cwe":["CWE-125","CWE-125"],"vendor":"redhat","product":"enterprise_linux","affected":["enterprise_linux = 6.0","enterprise_linux = 7.0","enterprise_linux = 8.0","enterprise_linux = 9.0"],"published":"2023-11-16","updated":"2026-10-14","sourceUpdated":"2026-10-14T22:17:21.877","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-6121","references":[{"url":"https://access.redhat.com/errata/RHSA-2024:2394","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2024:2950","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2024:3138","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2023-6121","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2250043","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2024:2394","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2024:2950","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2024:3138","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/security/cve/CVE-2023-6121","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2250043","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2024/01/msg00005.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-265688.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-613116.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd"],"epss":0.01643,"epssPercentile":0.75947,"ingestedAt":"2026-10-14T23:00:02.007Z","slug":"CVE-2023-6121","body":"## Overview\n\nAn 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).\n\n## Affected\n\n- `enterprise_linux = 6.0`\n- `enterprise_linux = 7.0`\n- `enterprise_linux = 8.0`\n- `enterprise_linux = 9.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}