{"id":"CVE-2026-23083","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nfou: Don't allow 0 for FOU_ATTR_IPPROTO.\n\nfou_udp_recv() has the same problem mentioned in the previous\npatch.\n\nIf FOU_ATTR_IPPROTO is set to 0, skb is not freed by\nfou…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nfou: Don't allow 0 for FOU_ATTR_IPPROTO.\n\nfou_udp_recv() has the same problem mentioned in the previous\npatch.\n\nIf FOU_ATTR_IPPROTO is set to 0, skb is not freed by\nfou…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 3.18, < 5.10.249","linux_kernel >= 5.11, < 5.15.199","linux_kernel >= 5.16, < 6.1.162","linux_kernel >= 6.2, < 6.6.122","linux_kernel >= 6.7, < 6.12.68","linux_kernel >= 6.13, < 6.18.8","linux_kernel = 6.19"],"patched":["linux_kernel 6.18.8"],"published":"2026-02-04","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:18:41.103","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-23083","references":[{"url":"https://git.kernel.org/stable/c/1cc98b8887cabb1808d2f4a37cd10a7be7574771","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/611ef4bd9c73d9e6d87bed57a635ff1fdd8c91ea","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6e983789b7588ee59cbf303583546c043bad8e19","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7a9bc9e3f42391e4c187e099263cf7a1c4b69ff5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9b75dff8446ec871030d8daf5a69e74f5fe8b956","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b7db31a52c3862a1a32202a273a4c32e7f5f4823","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c7498f9bc390479ccfad7c7f2332237ff4945b03","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00154,"epssPercentile":0.04519,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-06-10T20:41:31.350182Z"},"ingestedAt":"2026-09-08T15:33:26.994Z","slug":"CVE-2026-23083","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nfou: Don't allow 0 for FOU_ATTR_IPPROTO.\n\nfou_udp_recv() has the same problem mentioned in the previous\npatch.\n\nIf FOU_ATTR_IPPROTO is set to 0, skb is not freed by\nfou_udp_recv() nor \"resubmit\"-ted in ip_protocol_deliver_rcu().\n\nLet's forbid 0 for FOU_ATTR_IPPROTO.\n\n## Affected\n\n- `linux_kernel >= 3.18, < 5.10.249`\n- `linux_kernel >= 5.11, < 5.15.199`\n- `linux_kernel >= 5.16, < 6.1.162`\n- `linux_kernel >= 6.2, < 6.6.122`\n- `linux_kernel >= 6.7, < 6.12.68`\n- `linux_kernel >= 6.13, < 6.18.8`\n- `linux_kernel = 6.19`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.18.8`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":221617,"id":"CVE-2026-23083","ts":1792035291332,"field":"cvss","old":null,"new":"7.8"},{"seq":221616,"id":"CVE-2026-23083","ts":1792035291332,"field":"severity","old":"none","new":"high"}]}