{"id":"CVE-2026-74705","summary":"udp: fix potential use-after-free in tunnel segmentation","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nudp: fix potential use-after-free in tunnel segmentation\n\n__skb_udp_tunnel_segment() gets the UDP header before ensuring the\ntunnel header is in the skb head. If the pull reallocates skb-\u003ehead,\nthe saved UDP header pointer is no longer valid.\n\nGet the UDP header after the pull to avoid a potential use-after-free.","modified":"2026-08-27T11:30:55.761816065Z","published":"2026-08-22T15:33:04.110Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74705.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74705.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74705"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"dbef491ebe7f3a4fb1b9111878b86a426fd540b7"},{"fixed":"6a733a38b983d8c2e222f13968209010cf44de87"},{"fixed":"19d89b13a43640b2da2f277ee462d919d988cb6f"},{"fixed":"b3df61bb745eb5201eac22679a2839d4ccbf3442"},{"fixed":"1ae134c012e10384cdac420b5cc6e0615cde0b55"},{"fixed":"5161e67c561c4f28a5d9335a6e859b02511de92b"},{"fixed":"64d322c288577793eedd352b96ef75234ed380fe"},{"fixed":"588d4a6795d99d080f74ef0b5f391ea8c453ae5d"},{"fixed":"d0f86fb36eb260abd10007b62c9dcc1028e03e61"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74705.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.6.0"},{"fixed":"5.10.265"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.216"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.152"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.104"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.45"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74705.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"}]}