{"id":"CVE-2026-98201","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nInput: zero ff_effect before compat copy in input_ff_effect_from_user\n\nIn the compat path input_ff_effect_from_user() aliases the caller's\nnative struct ff_effect with …","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nInput: zero ff_effect before compat copy in input_ff_effect_from_user\n\nIn the compat path input_ff_effect_from_user() aliases the caller's\nnative struct ff_effect with …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 2d56f3a32c0e62f99c043d2579840f9731fe5855 < ed0905fda39682d3da7937184397d3276abbffa8","Linux >= 2d56f3a32c0e62f99c043d2579840f9731fe5855 < ec174c2ab1abb76b20fa167c6db848c3d97aa838","Linux >= 2d56f3a32c0e62f99c043d2579840f9731fe5855 < 6c26681c5668c973bd0e951407d670ac60d9cd66","Linux >= 2d56f3a32c0e62f99c043d2579840f9731fe5855 < c5e573bb095d502be7cbbaa99c26a20984111c6d","Linux >= 2d56f3a32c0e62f99c043d2579840f9731fe5855 < b878720e8bcaa4cf7163a5081f904dd6baf11b2c","Linux >= 2d56f3a32c0e62f99c043d2579840f9731fe5855 < 0d05b43b55d4784a42ce8fb318175f8ad7d9af5a","Linux >= 2d56f3a32c0e62f99c043d2579840f9731fe5855 < ed0406e490f48ed180df140fe2a81be26bccb1a9","Linux >= 2d56f3a32c0e62f99c043d2579840f9731fe5855 < f84819ef8d66931ee3998fee3c4f03230f4cb6cc","Linux 2.6.29"],"published":"2026-10-06","updated":"2026-10-06","sourceUpdated":"2026-10-06T09:18:05.900","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98201","references":[{"url":"https://git.kernel.org/stable/c/0d05b43b55d4784a42ce8fb318175f8ad7d9af5a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6c26681c5668c973bd0e951407d670ac60d9cd66","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b878720e8bcaa4cf7163a5081f904dd6baf11b2c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c5e573bb095d502be7cbbaa99c26a20984111c6d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ec174c2ab1abb76b20fa167c6db848c3d97aa838","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ed0406e490f48ed180df140fe2a81be26bccb1a9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ed0905fda39682d3da7937184397d3276abbffa8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f84819ef8d66931ee3998fee3c4f03230f4cb6cc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-06T08:50:17.445Z","slug":"CVE-2026-98201","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nInput: zero ff_effect before compat copy in input_ff_effect_from_user\n\nIn the compat path input_ff_effect_from_user() aliases the caller's\nnative struct ff_effect with the smaller struct ff_effect_compat and\ncopies only the compat sized prefix:\n\n\tcompat_effect = (struct ff_effect_compat *)effect;\n\n\tif (copy_from_user(compat_effect, buffer,\n\t\t\t   sizeof(struct ff_effect_compat)))\n\nThe tail of the native structure is never written. Callers pass an\nuninitialized on-stack object, for example evdev_do_ioctl() for\nEVIOCSFF, so those bytes keep their previous stack contents.\ninput_ff_upload() then stores the full native structure in\nff->effects[id], from where a uinput based force feedback daemon can\nread it back via UI_BEGIN_FF_UPLOAD, disclosing kernel stack memory to\nuserspace.\n\nZero the effect before the compat copy.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}