{"id":"CVE-2026-80846","title":"kernel: xfrm: drop ESP-in-TCP packets with no ingress device (CVE-2026-80846)","summary":"A flaw was found in the Linux kernel's xfrm subsystem, which handles ESP-in-TCP packets. When queued ESP-in-TCP data is processed after its ingress network device has been removed, the system attempts to dereference a null pointer. This ca…","severity":"medium","cvss":5.1,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-476","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-04","updated":"2026-10-25","sourceUpdated":"2026-10-25T22:41:58+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80846.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80846.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80846"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2528647"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80846"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80846"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80846.mbox"},{"url":"https://kernelcve.org/list/?q=CVE-2026-80846"},{"url":"https://git.kernel.org/stable/c/239d0f71af09dc2029fd4d730cb24b8c83aaa43a"},{"url":"https://git.kernel.org/stable/c/f00235f9d12301183d61f75fbe4105506f3e5140"},{"url":"https://git.kernel.org/stable/c/6af5cdb03819a5ce6e945992635c6c5e91045367"},{"url":"https://git.kernel.org/stable/c/2dd1609cadff46c4b20ce53b91ab9cce1380456a"},{"url":"https://git.kernel.org/stable/c/c296d25efbc840be24de83f56d43bc47e714ace9"},{"url":"https://git.kernel.org/stable/c/328e40aa774b446969c69b654c52a051a95af8a1"},{"url":"https://git.kernel.org/stable/c/7911e0236616487b89db6bd3ba3f408abd10eb23"},{"url":"https://git.kernel.org/stable/c/943d95233b8b4a88994e244fcf466f8c403d63f1"},{"url":"https://git.kernel.org/stable/c/e1d7c5ac1c246ce5775f604515de0a59fbf2116e"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00195,"epssPercentile":0.09135,"ingestedAt":"2026-10-19T09:16:01.496Z","slug":"CVE-2026-80846","body":"## Overview\n\nA flaw was found in the Linux kernel's xfrm subsystem, which handles ESP-in-TCP packets. When queued ESP-in-TCP data is processed after its ingress network device has been removed, the system attempts to dereference a null pointer. This can lead to a system crash, 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 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-25 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80846.json)\n\n**kernel: xfrm: drop ESP-in-TCP packets with no ingress device** — rated Moderate by Red Hat. Released 2026-09-04, updated 2026-10-25.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 8\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 8\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\n## Remediation\n\nFix deferred\n\nWorkarounds / mitigations:\n\n- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.","depth":"sunlit","depthScore":28,"depthScoreParts":{"impact":28.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":229481,"id":"CVE-2026-80846","ts":1793019790754,"field":"cvss","old":null,"new":"5.1"},{"seq":229480,"id":"CVE-2026-80846","ts":1793019790754,"field":"severity","old":"none","new":"medium"}]}