{"id":"CVE-2025-40216","title":"io_uring/rsrc: don't rely on user vaddr alignment","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/rsrc: don't rely on user vaddr alignment\n\nThere is no guaranteed alignment for user pointers, however the\ncalculation of an offset of the first page into a fol…","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","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= a8edbb424b1391b077407c75d8f5d2ede77aa70d < 50998b0ae7d9d552e96d8b7239981cf05f65eff5","Linux >= a8edbb424b1391b077407c75d8f5d2ede77aa70d < f16769241594be59387b56ab525e327f54377e60","Linux >= a8edbb424b1391b077407c75d8f5d2ede77aa70d < 3a3c6d61577dbb23c09df3e21f6f9eda1ecd634b","Linux 6.12"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T21:58:17.038442Z"},"published":"2025-12-04","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:02:41.119Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-40216","references":[{"url":"https://git.kernel.org/stable/c/50998b0ae7d9d552e96d8b7239981cf05f65eff5"},{"url":"https://git.kernel.org/stable/c/f16769241594be59387b56ab525e327f54377e60"},{"url":"https://git.kernel.org/stable/c/3a3c6d61577dbb23c09df3e21f6f9eda1ecd634b"}],"tags":["cve.org"],"epss":0.00142,"epssPercentile":0.03116,"ingestedAt":"2026-10-15T22:48:25.552Z","slug":"CVE-2025-40216","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/rsrc: don't rely on user vaddr alignment\n\nThere is no guaranteed alignment for user pointers, however the\ncalculation of an offset of the first page into a folio after coalescing\nuses some weird bit mask logic, get rid of it.\n\n## Affected\n\n- `Linux >= a8edbb424b1391b077407c75d8f5d2ede77aa70d < 50998b0ae7d9d552e96d8b7239981cf05f65eff5`\n- `Linux >= a8edbb424b1391b077407c75d8f5d2ede77aa70d < f16769241594be59387b56ab525e327f54377e60`\n- `Linux >= a8edbb424b1391b077407c75d8f5d2ede77aa70d < 3a3c6d61577dbb23c09df3e21f6f9eda1ecd634b`\n- `Linux 6.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}