{"id":"CVE-2026-72351","title":"gue: validate REMCSUM private option length","summary":"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 accounte…","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 >= c1aa8347e73e4092411fbd96cc59531fb7e76d04 < 158b9995d3c87f3b93f5c22df54a12e12a3438b3","Linux >= c1aa8347e73e4092411fbd96cc59531fb7e76d04 < 7c6876ec1b227261b51803f784c7be1b2242a1a0","Linux >= c1aa8347e73e4092411fbd96cc59531fb7e76d04 < 2c4de9988e9ddc760b750d6b6e701c35ff60ad14","Linux >= c1aa8347e73e4092411fbd96cc59531fb7e76d04 < 2a99224c120823987e4d829726f4ecb33e03fc1e","Linux >= c1aa8347e73e4092411fbd96cc59531fb7e76d04 < 61e78679c7c9ca685bff58e4b6348304dc60aafd","Linux >= c1aa8347e73e4092411fbd96cc59531fb7e76d04 < 4a4a1d41c6e901e773bcf795f562a47fa71f692a","Linux >= c1aa8347e73e4092411fbd96cc59531fb7e76d04 < f618cbe9b24cd0202004d2db781d5f80ab77037f","Linux >= c1aa8347e73e4092411fbd96cc59531fb7e76d04 < d335dcc6f521571d57117b8deeebc940836e5450","Linux 3.19"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T18:47:48.615145Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T18:55:19.979Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72351","references":[{"url":"https://git.kernel.org/stable/c/158b9995d3c87f3b93f5c22df54a12e12a3438b3"},{"url":"https://git.kernel.org/stable/c/7c6876ec1b227261b51803f784c7be1b2242a1a0"},{"url":"https://git.kernel.org/stable/c/2c4de9988e9ddc760b750d6b6e701c35ff60ad14"},{"url":"https://git.kernel.org/stable/c/2a99224c120823987e4d829726f4ecb33e03fc1e"},{"url":"https://git.kernel.org/stable/c/61e78679c7c9ca685bff58e4b6348304dc60aafd"},{"url":"https://git.kernel.org/stable/c/4a4a1d41c6e901e773bcf795f562a47fa71f692a"},{"url":"https://git.kernel.org/stable/c/f618cbe9b24cd0202004d2db781d5f80ab77037f"},{"url":"https://git.kernel.org/stable/c/d335dcc6f521571d57117b8deeebc940836e5450"}],"tags":["cve.org"],"epss":0.00745,"epssPercentile":0.53884,"ingestedAt":"2026-10-16T19:46:24.403Z","slug":"CVE-2026-72351","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= c1aa8347e73e4092411fbd96cc59531fb7e76d04 < 158b9995d3c87f3b93f5c22df54a12e12a3438b3`\n- `Linux >= c1aa8347e73e4092411fbd96cc59531fb7e76d04 < 7c6876ec1b227261b51803f784c7be1b2242a1a0`\n- `Linux >= c1aa8347e73e4092411fbd96cc59531fb7e76d04 < 2c4de9988e9ddc760b750d6b6e701c35ff60ad14`\n- `Linux >= c1aa8347e73e4092411fbd96cc59531fb7e76d04 < 2a99224c120823987e4d829726f4ecb33e03fc1e`\n- `Linux >= c1aa8347e73e4092411fbd96cc59531fb7e76d04 < 61e78679c7c9ca685bff58e4b6348304dc60aafd`\n- `Linux >= c1aa8347e73e4092411fbd96cc59531fb7e76d04 < 4a4a1d41c6e901e773bcf795f562a47fa71f692a`\n- `Linux >= c1aa8347e73e4092411fbd96cc59531fb7e76d04 < f618cbe9b24cd0202004d2db781d5f80ab77037f`\n- `Linux >= c1aa8347e73e4092411fbd96cc59531fb7e76d04 < d335dcc6f521571d57117b8deeebc940836e5450`\n- `Linux 3.19`\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":0.1,"exploitation":0,"ransomware":0},"changes":[]}