{"id":"CVE-2025-40099","title":"cifs: parse_dfs_referrals: prevent oob on malformed input","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: parse_dfs_referrals: prevent oob on malformed input\n\nMalicious SMB server can send invalid reply to FSCTL_DFS_GET_REFERRALS\n\n- reply smaller than sizeof(struct ge…","severity":"critical","cvss":9.4,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < cfacc7441f760e4a73cc71b6ff1635261d534657","Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < 15c73964da9df994302f579ed14ee5fdbce7a332","Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < 8bc4a8d39bac23d8b044fd3e2dbfd965f1d9b058","Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < bb0f2e66e1ac043a5b238f5bcab4f26f3c317039","Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < 6447b0e355562a1ff748c4a2ffb89aae7e84d2c9","Linux 4.11"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-15T21:56:50.620033Z"},"published":"2025-10-30","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:02:37.745Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-40099","references":[{"url":"https://git.kernel.org/stable/c/cfacc7441f760e4a73cc71b6ff1635261d534657"},{"url":"https://git.kernel.org/stable/c/15c73964da9df994302f579ed14ee5fdbce7a332"},{"url":"https://git.kernel.org/stable/c/8bc4a8d39bac23d8b044fd3e2dbfd965f1d9b058"},{"url":"https://git.kernel.org/stable/c/bb0f2e66e1ac043a5b238f5bcab4f26f3c317039"},{"url":"https://git.kernel.org/stable/c/6447b0e355562a1ff748c4a2ffb89aae7e84d2c9"}],"tags":["cve.org"],"epss":0.0041,"epssPercentile":0.35033,"ingestedAt":"2026-10-15T22:48:25.546Z","slug":"CVE-2025-40099","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ncifs: parse_dfs_referrals: prevent oob on malformed input\n\nMalicious SMB server can send invalid reply to FSCTL_DFS_GET_REFERRALS\n\n- reply smaller than sizeof(struct get_dfs_referral_rsp)\n- reply with number of referrals smaller than NumberOfReferrals in the\nheader\n\nProcessing of such replies will cause oob.\n\nReturn -EINVAL error on such replies to prevent oob-s.\n\n## Affected\n\n- `Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < cfacc7441f760e4a73cc71b6ff1635261d534657`\n- `Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < 15c73964da9df994302f579ed14ee5fdbce7a332`\n- `Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < 8bc4a8d39bac23d8b044fd3e2dbfd965f1d9b058`\n- `Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < bb0f2e66e1ac043a5b238f5bcab4f26f3c317039`\n- `Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < 6447b0e355562a1ff748c4a2ffb89aae7e84d2c9`\n- `Linux 4.11`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":52,"depthScoreParts":{"impact":51.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}