{"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":"high","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"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98201.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98201"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2546542"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98201"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98201"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98201.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-10-06T08:50:17.445Z","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":["CWE-908"],"epss":0.00177,"epssPercentile":0.07178,"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.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98201.json)","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":218414,"id":"CVE-2026-98201","ts":1791533716577,"field":"cvss","old":null,"new":"7"},{"seq":218413,"id":"CVE-2026-98201","ts":1791533716577,"field":"severity","old":"none","new":"high"}]}