{"id":"CVE-2023-6535","title":"Kernel: null pointer dereference in nvmet_tcp_execute_request","summary":"A flaw was found in the Linux kernel's NVMe driver. This issue may allow an unauthenticated malicious actor to send a set of crafted TCP packages when using NVMe over TCP, leading the NVMe driver to a NULL pointer dereference in the NVMe…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-476"],"vendor":"Red Hat","product":"kernel-rt","affected":["kernel-rt (all versions)","kernel (all versions)","kernel (all versions)","kernel (all versions)","kernel (all versions)","kernel (all versions)","kernel (all versions)","kernel-rt (all versions)","kernel (all versions)","openshift-logging/cluster-logging-operator-bundle (all versions)","openshift-logging/cluster-logging-rhel9-operator (all versions)","openshift-logging/elasticsearch6-rhel9 (all versions)","openshift-logging/elasticsearch-operator-bundle (all versions)","openshift-logging/elasticsearch-proxy-rhel9 (all versions)","openshift-logging/elasticsearch-rhel9-operator (all versions)","openshift-logging/eventrouter-rhel9 (all versions)","openshift-logging/fluentd-rhel9 (all versions)","openshift-logging/log-file-metric-exporter-rhel9 (all versions)","openshift-logging/logging-curator5-rhel9 (all versions)","openshift-logging/logging-loki-rhel9 (all versions)","openshift-logging/logging-view-plugin-rhel9 (all versions)","openshift-logging/loki-operator-bundle (all versions)","openshift-logging/loki-rhel9-operator (all versions)","openshift-logging/lokistack-gateway-rhel9 (all versions)","openshift-logging/opa-openshift-rhel9 (all versions)","openshift-logging/vector-rhel9 (all versions)","kernel","kernel","kernel-rt","kernel-rt (all versions)"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2024-02-08T17:12:36.607009Z"},"published":"2024-02-07","updated":"2026-11-05","sourceUpdated":"2026-11-05T11:37:10.300Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-6535","references":[{"url":"https://access.redhat.com/errata/RHSA-2024:0723","label":"RHSA-2024:0723"},{"url":"https://access.redhat.com/errata/RHSA-2024:0724","label":"RHSA-2024:0724"},{"url":"https://access.redhat.com/errata/RHSA-2024:0725","label":"RHSA-2024:0725"},{"url":"https://access.redhat.com/errata/RHSA-2024:0881","label":"RHSA-2024:0881"},{"url":"https://access.redhat.com/errata/RHSA-2024:0897","label":"RHSA-2024:0897"},{"url":"https://access.redhat.com/errata/RHSA-2024:1248","label":"RHSA-2024:1248"},{"url":"https://access.redhat.com/errata/RHSA-2024:2094","label":"RHSA-2024:2094"},{"url":"https://access.redhat.com/errata/RHSA-2024:3810","label":"RHSA-2024:3810"},{"url":"https://access.redhat.com/security/cve/CVE-2023-6535"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2254053","label":"RHBZ#2254053"}],"tags":["cve.org"],"epss":0.01549,"epssPercentile":0.75146,"ingestedAt":"2026-11-05T21:36:00.809Z","slug":"CVE-2023-6535","body":"## Overview\n\nA flaw was found in the Linux kernel's NVMe driver. This issue may allow an unauthenticated malicious actor to send a set of crafted TCP packages when using NVMe over TCP, leading the NVMe driver to a NULL pointer dereference in the NVMe driver, causing kernel panic and a denial of service.\n\n## Affected\n\n- `kernel-rt (all versions)`\n- `kernel (all versions)`\n- `kernel (all versions)`\n- `kernel (all versions)`\n- `kernel (all versions)`\n- `kernel (all versions)`\n- `kernel (all versions)`\n- `kernel-rt (all versions)`\n- `kernel (all versions)`\n- `openshift-logging/cluster-logging-operator-bundle (all versions)`\n- `openshift-logging/cluster-logging-rhel9-operator (all versions)`\n- `openshift-logging/elasticsearch6-rhel9 (all versions)`\n- `openshift-logging/elasticsearch-operator-bundle (all versions)`\n- `openshift-logging/elasticsearch-proxy-rhel9 (all versions)`\n- `openshift-logging/elasticsearch-rhel9-operator (all versions)`\n- `openshift-logging/eventrouter-rhel9 (all versions)`\n- `openshift-logging/fluentd-rhel9 (all versions)`\n- `openshift-logging/log-file-metric-exporter-rhel9 (all versions)`\n- `openshift-logging/logging-curator5-rhel9 (all versions)`\n- `openshift-logging/logging-loki-rhel9 (all versions)`\n- `openshift-logging/logging-view-plugin-rhel9 (all versions)`\n- `openshift-logging/loki-operator-bundle (all versions)`\n- `openshift-logging/loki-rhel9-operator (all versions)`\n- `openshift-logging/lokistack-gateway-rhel9 (all versions)`\n- `openshift-logging/opa-openshift-rhel9 (all versions)`\n- `openshift-logging/vector-rhel9 (all versions)`\n- `kernel`\n- `kernel`\n- `kernel-rt`\n- `kernel-rt (all versions)`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n### Workarounds\n\nTo mitigate this issue, prevent module nvmet-tcp from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}