{"id":"CVE-2026-98201","published":"2026-10-06T09:18:05.900","lastModified":"2026-10-06T09:18:05.900","description":"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 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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/0d05b43b55d4784a42ce8fb318175f8ad7d9af5a","tags":[]},{"url":"https://git.kernel.org/stable/c/6c26681c5668c973bd0e951407d670ac60d9cd66","tags":[]},{"url":"https://git.kernel.org/stable/c/b878720e8bcaa4cf7163a5081f904dd6baf11b2c","tags":[]},{"url":"https://git.kernel.org/stable/c/c5e573bb095d502be7cbbaa99c26a20984111c6d","tags":[]},{"url":"https://git.kernel.org/stable/c/ec174c2ab1abb76b20fa167c6db848c3d97aa838","tags":[]},{"url":"https://git.kernel.org/stable/c/ed0406e490f48ed180df140fe2a81be26bccb1a9","tags":[]},{"url":"https://git.kernel.org/stable/c/ed0905fda39682d3da7937184397d3276abbffa8","tags":[]},{"url":"https://git.kernel.org/stable/c/f84819ef8d66931ee3998fee3c4f03230f4cb6cc","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}