{"id":"CVE-2026-98570","title":"kernel: net: ipv6: keep room for the mac header in dst_dev_overhead() (CVE-2026-98570)","summary":"A flaw was found in the Linux kernel's IPv6 networking subsystem. An unauthenticated remote attacker can cause a Denial of Service (DoS) by sending network traffic through an affected IPv6 tunnel interface. Due to insufficient buffer alloc…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-787","vendor":"Red Hat","product":"Linux","affected":["Linux >= dce525185bc92864e5a318040285ee070563fe34 < 36c07127924f11fc5741a780abcaaf808fe9ef13","Linux >= dce525185bc92864e5a318040285ee070563fe34 < 87cd6b717e4069dca34e0866e57eaeb44d3b173e","Linux 8471e228448a818e4c27cab4b681b2e758e46cf5","Linux c432cd18a07b623651ed15ea167bd303467004cc","Linux 634710a372ba65bee667c2f6e58a97658c639eab","Linux c447c5a9c47bb4858ab12bf90879fe595d2b7f46","Linux ab9de9c48316d2622d3bf353916b99971570e2c9","Linux 2fcc9f3798ef82399564d247458e69abd10e683b","Linux 371d8dc298b4f59e99b4564ac5d906fce0932c69","Linux b26f015dfb07b6be12d005a0ed0c5c43b7bedbf3","Linux c0b11dc50590e10590b39dcda79835cd32f49d00","Linux 4c12c3c8abd8b888945d31e7bdbb0d8b73032fc5","Linux 25d8e065c7972dc98fd7a4cac322d5367eaede88","Linux 4a855c5aec41bf84922224ab7a74e088776e3ac4","Linux a9f0407414e16176fdbbbd298c9e18d6dfdf96bc","Linux >= 6.12.16 < 6.13","Linux >= 6.13.4 < 6.14","Linux >= 5.15.179 < 5.16","Linux >= 6.1.130 < 6.2","Linux >= 6.6.81 < 6.7","Linux >= 5.10.235 < 5.11","Linux 6.14"],"published":"2026-10-18","updated":"2026-10-20","sourceUpdated":"2026-10-20T03:08:33+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98570.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98570.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98570"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2554991"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98570"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98570"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98570.mbox"},{"url":"https://git.kernel.org/stable/c/36c07127924f11fc5741a780abcaaf808fe9ef13"},{"url":"https://git.kernel.org/stable/c/87cd6b717e4069dca34e0866e57eaeb44d3b173e"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00189,"epssPercentile":0.08473,"ingestedAt":"2026-10-18T15:45:12.258Z","slug":"CVE-2026-98570","body":"## Overview\n\nA flaw was found in the Linux kernel's IPv6 networking subsystem. An unauthenticated remote attacker can cause a Denial of Service (DoS) by sending network traffic through an affected IPv6 tunnel interface. Due to insufficient buffer allocation when reconstructing packet headers, an unchecked negative offset triggers an out-of-bounds memory write. This vulnerability can lead to an immediate system crash and potential memory corruption.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98570.json)\n\n**kernel: net: ipv6: keep room for the mac header in dst_dev_overhead()** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-20.\n\nNot affected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\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\nRefer to the advisory for fix availability.","depth":"sunlit","depthScore":32,"depthScoreParts":{"impact":32.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":225786,"id":"CVE-2026-98570","ts":1792498453074,"field":"cvss","old":null,"new":"5.9"},{"seq":225785,"id":"CVE-2026-98570","ts":1792498453074,"field":"severity","old":"none","new":"medium"}]}