{"id":"CVE-2026-72351","summary":"gue: validate REMCSUM private option length","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ngue: validate REMCSUM private option length\n\nGUE private flags can indicate that remote checksum offload metadata is\npresent. The private flags field itself is accounted for by\nguehdr_flags_len(), but guehdr_priv_flags_len() currently returns 0 even\nwhen GUE_PFLAG_REMCSUM is set.\n\nThis lets a packet with only the private flags field pass\nvalidate_gue_flags(), after which gue_remcsum() and gue_gro_remcsum()\nread the missing REMCSUM start/offset fields from the following bytes.\n\nAccount for GUE_PLEN_REMCSUM when GUE_PFLAG_REMCSUM is present so that\nmalformed packets are rejected during option validation.","modified":"2026-08-18T03:56:24.225775002Z","published":"2026-08-15T05:55:54.150Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72351.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/158b9995d3c87f3b93f5c22df54a12e12a3438b3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2a99224c120823987e4d829726f4ecb33e03fc1e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2c4de9988e9ddc760b750d6b6e701c35ff60ad14"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4a4a1d41c6e901e773bcf795f562a47fa71f692a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/61e78679c7c9ca685bff58e4b6348304dc60aafd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7c6876ec1b227261b51803f784c7be1b2242a1a0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d335dcc6f521571d57117b8deeebc940836e5450"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f618cbe9b24cd0202004d2db781d5f80ab77037f"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72351.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72351"},{"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":"c1aa8347e73e4092411fbd96cc59531fb7e76d04"},{"fixed":"158b9995d3c87f3b93f5c22df54a12e12a3438b3"},{"fixed":"7c6876ec1b227261b51803f784c7be1b2242a1a0"},{"fixed":"2c4de9988e9ddc760b750d6b6e701c35ff60ad14"},{"fixed":"2a99224c120823987e4d829726f4ecb33e03fc1e"},{"fixed":"61e78679c7c9ca685bff58e4b6348304dc60aafd"},{"fixed":"4a4a1d41c6e901e773bcf795f562a47fa71f692a"},{"fixed":"f618cbe9b24cd0202004d2db781d5f80ab77037f"},{"fixed":"d335dcc6f521571d57117b8deeebc940836e5450"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72351.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.19.0"},{"fixed":"5.10.261"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72351.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}