{"id":"CVE-2023-39191","title":"Kernel: ebpf: insufficient stack type checks in dynptr","summary":"An improper input validation flaw was found in the eBPF subsystem in the Linux kernel. The issue occurs due to a lack of proper validation of dynamic pointers within user-supplied eBPF programs prior to executing them. This may allow an …","severity":"high","cvss":8.2,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-20"],"vendor":"Red Hat","product":"kernel","affected":["kernel (all versions)","kernel (all versions)","kernel (all versions)","kernel-rt (all versions)","kpatch-patch","kernel","kernel","kernel-rt","kernel","kernel-rt","kernel-rt (all versions)"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2025-02-26T21:50:31.558165Z"},"published":"2023-10-04","updated":"2026-11-07","sourceUpdated":"2026-11-07T11:32:43.929Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-39191","references":[{"url":"https://access.redhat.com/errata/RHSA-2023:6583","label":"RHSA-2023:6583"},{"url":"https://access.redhat.com/errata/RHSA-2024:0381","label":"RHSA-2024:0381"},{"url":"https://access.redhat.com/errata/RHSA-2024:0439","label":"RHSA-2024:0439"},{"url":"https://access.redhat.com/errata/RHSA-2024:0448","label":"RHSA-2024:0448"},{"url":"https://access.redhat.com/security/cve/CVE-2023-39191"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2226783","label":"RHBZ#2226783"},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-CAN-19399/"}],"tags":["cve.org"],"epss":0.00531,"epssPercentile":0.45156,"zeroDay":true,"ingestedAt":"2026-11-07T12:16:41.109Z","slug":"CVE-2023-39191","body":"## Overview\n\nAn improper input validation flaw was found in the eBPF subsystem in the Linux kernel. The issue occurs due to a lack of proper validation of dynamic pointers within user-supplied eBPF programs prior to executing them. This may allow an attacker with CAP_BPF privileges to escalate privileges and execute arbitrary code in the context of the kernel.\n\n## Affected\n\n- `kernel (all versions)`\n- `kernel (all versions)`\n- `kernel (all versions)`\n- `kernel-rt (all versions)`\n- `kpatch-patch`\n- `kernel`\n- `kernel`\n- `kernel-rt`\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.","depth":"abyssal","depthScore":70,"depthScoreParts":{"impact":45.1,"likelihood":0.1,"exploitation":25,"ransomware":0},"changes":[]}