{"id":"CVE-2026-23204","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_u32: use skb_header_pointer_careful()\n\nskb_header_pointer() does not fully validate negative @offset values.\n\nUse skb_header_pointer_careful() instead.\n\n…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_u32: use skb_header_pointer_careful()\n\nskb_header_pointer() does not fully validate negative @offset values.\n\nUse skb_header_pointer_careful() instead.\n\n…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","cwe":["CWE-125"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 2.6.35.1, < 6.6.124","linux_kernel >= 6.7, < 6.12.70","linux_kernel >= 6.13, < 6.18.10","linux_kernel = 2.6.35","linux_kernel = 6.19"],"patched":["linux_kernel 6.18.10"],"published":"2026-02-14","updated":"2026-07-04","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-23204","references":[{"url":"https://git.kernel.org/stable/c/13336a6239b9d7c6e61483017bb8bdfe3ceb10a5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/29681ed51e737be14d18ecd1c304c57002e4b72c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/66e4b63d61c15de6ca5332d9ca6db59a404d7136","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8a672f177ebe19c93d795fbe967846084fbc7943","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cabd1a976375780dabab888784e356f574bbaed8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cfa745830e45ecb75c061aa34330ee0cac941cc7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e41a23e61259f5526af875c3b86b3d42a9bae0e5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00127,"epssPercentile":0.0198,"ingestedAt":"2026-07-04T12:56:09.277Z","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-16T20:32:50.609345Z"},"slug":"CVE-2026-23204","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_u32: use skb_header_pointer_careful()\n\nskb_header_pointer() does not fully validate negative @offset values.\n\nUse skb_header_pointer_careful() instead.\n\nGangMin Kim provided a report and a repro fooling u32_classify():\n\nBUG: KASAN: slab-out-of-bounds in u32_classify+0x1180/0x11b0\nnet/sched/cls_u32.c:221\n\n## Affected\n\n- `linux_kernel >= 2.6.35.1, < 6.6.124`\n- `linux_kernel >= 6.7, < 6.12.70`\n- `linux_kernel >= 6.13, < 6.18.10`\n- `linux_kernel = 2.6.35`\n- `linux_kernel = 6.19`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.18.10`","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}