{"id":"CVE-2026-98573","title":"kernel: net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6() (CVE-2026-98573)","summary":"A flaw was found in the Linux kernel. An integer underflow in the networking subsystem allows an attacker to trigger an out-of-bounds memory copy by sending specially crafted Internet Protocol version 6 (IPv6) packets with extension header…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-191","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4","enterprise_linux 6"],"published":"2026-10-18","updated":"2026-10-20","sourceUpdated":"2026-10-20T03:22:33+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98573.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98573.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98573"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2554955"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98573"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98573"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98573.mbox"},{"url":"https://git.kernel.org/stable/c/9c4e432132a97b82edf28fa172c39f743e6bfb26"},{"url":"https://git.kernel.org/stable/c/718747afa5463d9cc5fd9a09f03b2a492edd9b78"},{"url":"https://git.kernel.org/stable/c/a0ad0473c09d2e947aecac5c82e637ec85924b12"},{"url":"https://git.kernel.org/stable/c/b2da5ed3d8c75e1b729a21b6d3beaed415e263f6"},{"url":"https://git.kernel.org/stable/c/6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b"},{"url":"https://git.kernel.org/stable/c/cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962"},{"url":"https://git.kernel.org/stable/c/d7f474226809471dc7877435e9c492cc914df0bf"},{"url":"https://git.kernel.org/stable/c/3b4e0b0c008a8c1b474730248cd5b873026c74bd"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00216,"epssPercentile":0.11992,"ingestedAt":"2026-10-18T15:45:12.257Z","slug":"CVE-2026-98573","body":"## Overview\n\nA flaw was found in the Linux kernel. An integer underflow in the networking subsystem allows an attacker to trigger an out-of-bounds memory copy by sending specially crafted Internet Protocol version 6 (IPv6) packets with extension headers. This vulnerability can lead to kernel memory corruption, resulting in a system crash and a Denial of Service (DoS).\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98573.json)\n\n**kernel: net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()** — rated Important by Red Hat. Released 2026-10-18, updated 2026-10-20.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n- Red Hat Enterprise Linux 6\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nAffected","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":225775,"id":"CVE-2026-98573","ts":1792498449993,"field":"cvss","old":null,"new":"7.5"},{"seq":225774,"id":"CVE-2026-98573","ts":1792498449993,"field":"severity","old":"none","new":"high"}]}