{"id":"CVE-2026-80976","title":"kernel: seg6: reset IP6CB after IPv6 decapsulation (CVE-2026-80976)","summary":"A flaw was found in the Linux kernel's IPv6 Segment Routing (seg6) implementation. An unprivileged user can exploit this vulnerability by injecting a specially crafted IPv6 packet. This can lead to an out-of-bounds read, potentially causin…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":"CWE-125","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T18:58:12+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80976.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80976.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80976"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532485"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80976"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80976"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80976.mbox"},{"url":"https://git.kernel.org/stable/c/d1f0d353358987ca87f21d8956e2d2854951130d"},{"url":"https://git.kernel.org/stable/c/a0e2b0a3718f0cf9fb0ee41710b4a6348a7315c8"},{"url":"https://git.kernel.org/stable/c/9ae92198c24d7dacd4070e2f34f6e1ed3a63061c"},{"url":"https://git.kernel.org/stable/c/96c74420ac92930a7e0f21770818544eee4a93d7"},{"url":"https://git.kernel.org/stable/c/2b154e96fcb3f01fd42765c64e0a56820fbc16eb"},{"url":"https://git.kernel.org/stable/c/cfa186a0857a0f831dfca67b16bbc40ecfdf3280"},{"url":"https://git.kernel.org/stable/c/c73fb911e02b9a766c950bc9707f3e3a96ffd702"},{"url":"https://git.kernel.org/stable/c/f967455fb2a5a2079b9eb5823e9ccf359174bf9f"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00704,"epssPercentile":0.51873,"scores":{"vendor":7,"cna":9.8},"ingestedAt":"2026-09-14T15:23:07.455Z","slug":"CVE-2026-80976","body":"## Overview\n\nA flaw was found in the Linux kernel's IPv6 Segment Routing (seg6) implementation. An unprivileged user can exploit this vulnerability by injecting a specially crafted IPv6 packet. This can lead to an out-of-bounds read, potentially causing a system crash and resulting in a Denial of Service (DoS).\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80976.json)\n\n**kernel: seg6: reset IP6CB after IPv6 decapsulation** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":204185,"id":"CVE-2026-80976","ts":1789490237601,"field":"cvss","old":"9.8","new":"7"},{"seq":204184,"id":"CVE-2026-80976","ts":1789490237601,"field":"severity","old":"critical","new":"high"},{"seq":183813,"id":"CVE-2026-80976","ts":1789356677499,"field":"cvss","old":"9.8","new":"4.7"},{"seq":183812,"id":"CVE-2026-80976","ts":1789356677499,"field":"severity","old":"critical","new":"medium"},{"seq":153156,"id":"CVE-2026-80976","ts":1789285349332,"field":"cvss","old":null,"new":"9.8"},{"seq":153155,"id":"CVE-2026-80976","ts":1789285349332,"field":"severity","old":"none","new":"critical"},{"seq":147171,"id":"CVE-2026-80976","ts":1789270198721,"field":"cvss","old":null,"new":"4.7"},{"seq":147170,"id":"CVE-2026-80976","ts":1789270198721,"field":"severity","old":"none","new":"medium"},{"seq":108920,"id":"CVE-2026-80976","ts":1789183729543,"field":"cvss","old":null,"new":"4.7"},{"seq":108919,"id":"CVE-2026-80976","ts":1789183729543,"field":"severity","old":"none","new":"medium"}]}