{"id":"CVE-2026-43341","title":"net/ipv6: ioam6: prevent schema length wraparound in trace fill","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/ipv6: ioam6: prevent schema length wraparound in trace fill\n\nioam6_fill_trace_data() stores the schema contribution to the trace\nlength in a u8. With bit 22 enabled…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 8c6f6fa6772696be0c047a711858084b38763728 < d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2","Linux >= 8c6f6fa6772696be0c047a711858084b38763728 < e96d48b37708d53cbdc47f6f60b0714fc4a5f596","Linux >= 8c6f6fa6772696be0c047a711858084b38763728 < d1b041080086e91d3733a5438a8c51ad5d3d8e09","Linux >= 8c6f6fa6772696be0c047a711858084b38763728 < 77695a69baca9b99d95fad09fc78c2318736604f","Linux >= 8c6f6fa6772696be0c047a711858084b38763728 < 184d2e9db27c0f76226b5cad16fe29510a5d2280","Linux >= 8c6f6fa6772696be0c047a711858084b38763728 < d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d","Linux >= 8c6f6fa6772696be0c047a711858084b38763728 < 5e67ba9bb531e1ec6599a82a065dea9040b9ce50","Linux 5.15"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T15:16:35.670723Z"},"published":"2026-05-08","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:20:39.491Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43341","references":[{"url":"https://git.kernel.org/stable/c/d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2"},{"url":"https://git.kernel.org/stable/c/e96d48b37708d53cbdc47f6f60b0714fc4a5f596"},{"url":"https://git.kernel.org/stable/c/d1b041080086e91d3733a5438a8c51ad5d3d8e09"},{"url":"https://git.kernel.org/stable/c/77695a69baca9b99d95fad09fc78c2318736604f"},{"url":"https://git.kernel.org/stable/c/184d2e9db27c0f76226b5cad16fe29510a5d2280"},{"url":"https://git.kernel.org/stable/c/d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d"},{"url":"https://git.kernel.org/stable/c/5e67ba9bb531e1ec6599a82a065dea9040b9ce50"}],"tags":["cve.org"],"epss":0.00774,"epssPercentile":0.54881,"ingestedAt":"2026-10-16T17:24:46.692Z","slug":"CVE-2026-43341","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet/ipv6: ioam6: prevent schema length wraparound in trace fill\n\nioam6_fill_trace_data() stores the schema contribution to the trace\nlength in a u8. With bit 22 enabled and the largest schema payload,\nsclen becomes 1 + 1020 / 4, wraps from 256 to 0, and bypasses the\nremaining-space check. __ioam6_fill_trace_data() then positions the\nwrite cursor without reserving the schema area but still copies the\n4-byte schema header and the full schema payload, overrunning the trace\nbuffer.\n\nKeep sclen in an unsigned int so the remaining-space check and the write\ncursor calculation both see the full schema length.\n\n## Affected\n\n- `Linux >= 8c6f6fa6772696be0c047a711858084b38763728 < d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2`\n- `Linux >= 8c6f6fa6772696be0c047a711858084b38763728 < e96d48b37708d53cbdc47f6f60b0714fc4a5f596`\n- `Linux >= 8c6f6fa6772696be0c047a711858084b38763728 < d1b041080086e91d3733a5438a8c51ad5d3d8e09`\n- `Linux >= 8c6f6fa6772696be0c047a711858084b38763728 < 77695a69baca9b99d95fad09fc78c2318736604f`\n- `Linux >= 8c6f6fa6772696be0c047a711858084b38763728 < 184d2e9db27c0f76226b5cad16fe29510a5d2280`\n- `Linux >= 8c6f6fa6772696be0c047a711858084b38763728 < d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d`\n- `Linux >= 8c6f6fa6772696be0c047a711858084b38763728 < 5e67ba9bb531e1ec6599a82a065dea9040b9ce50`\n- `Linux 5.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}