{"id":"CVE-2026-98201","summary":"Input: zero ff_effect before compat copy in input_ff_effect_from_user","details":"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-\u003eeffects[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.","modified":"2026-10-07T02:47:30.039647676Z","published":"2026-10-06T08:44:38.952Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98201.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0d05b43b55d4784a42ce8fb318175f8ad7d9af5a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6c26681c5668c973bd0e951407d670ac60d9cd66"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b878720e8bcaa4cf7163a5081f904dd6baf11b2c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c5e573bb095d502be7cbbaa99c26a20984111c6d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ec174c2ab1abb76b20fa167c6db848c3d97aa838"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ed0406e490f48ed180df140fe2a81be26bccb1a9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ed0905fda39682d3da7937184397d3276abbffa8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f84819ef8d66931ee3998fee3c4f03230f4cb6cc"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98201.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98201"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"2d56f3a32c0e62f99c043d2579840f9731fe5855"},{"fixed":"ed0905fda39682d3da7937184397d3276abbffa8"},{"fixed":"ec174c2ab1abb76b20fa167c6db848c3d97aa838"},{"fixed":"6c26681c5668c973bd0e951407d670ac60d9cd66"},{"fixed":"c5e573bb095d502be7cbbaa99c26a20984111c6d"},{"fixed":"b878720e8bcaa4cf7163a5081f904dd6baf11b2c"},{"fixed":"0d05b43b55d4784a42ce8fb318175f8ad7d9af5a"},{"fixed":"ed0406e490f48ed180df140fe2a81be26bccb1a9"},{"fixed":"f84819ef8d66931ee3998fee3c4f03230f4cb6cc"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98201.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.29"},{"fixed":"5.10.271"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.222"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.189"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.158"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.112"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.54"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98201.json"}}],"schema_version":"1.9.0"}