{"id":"CVE-2026-98201","state":"PUBLISHED","title":"Input: zero ff_effect before compat copy in input_ff_effect_from_user","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.","publishedAt":"2026-10-06T08:44:38.952Z","updatedAt":"2026-10-19T09:15:32.269Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2d56f3a32c0e62f99c043d2579840f9731fe5855","status":"affected","lessThan":"ed0905fda39682d3da7937184397d3276abbffa8","versionType":"git"},{"version":"2d56f3a32c0e62f99c043d2579840f9731fe5855","status":"affected","lessThan":"ec174c2ab1abb76b20fa167c6db848c3d97aa838","versionType":"git"},{"version":"2d56f3a32c0e62f99c043d2579840f9731fe5855","status":"affected","lessThan":"6c26681c5668c973bd0e951407d670ac60d9cd66","versionType":"git"},{"version":"2d56f3a32c0e62f99c043d2579840f9731fe5855","status":"affected","lessThan":"c5e573bb095d502be7cbbaa99c26a20984111c6d","versionType":"git"},{"version":"2d56f3a32c0e62f99c043d2579840f9731fe5855","status":"affected","lessThan":"b878720e8bcaa4cf7163a5081f904dd6baf11b2c","versionType":"git"},{"version":"2d56f3a32c0e62f99c043d2579840f9731fe5855","status":"affected","lessThan":"0d05b43b55d4784a42ce8fb318175f8ad7d9af5a","versionType":"git"},{"version":"2d56f3a32c0e62f99c043d2579840f9731fe5855","status":"affected","lessThan":"ed0406e490f48ed180df140fe2a81be26bccb1a9","versionType":"git"},{"version":"2d56f3a32c0e62f99c043d2579840f9731fe5855","status":"affected","lessThan":"f84819ef8d66931ee3998fee3c4f03230f4cb6cc","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/input/input-compat.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.29","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.29","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.54","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/input/input-compat.c"]}],"references":["https://git.kernel.org/stable/c/ed0905fda39682d3da7937184397d3276abbffa8","https://git.kernel.org/stable/c/ec174c2ab1abb76b20fa167c6db848c3d97aa838","https://git.kernel.org/stable/c/6c26681c5668c973bd0e951407d670ac60d9cd66","https://git.kernel.org/stable/c/c5e573bb095d502be7cbbaa99c26a20984111c6d","https://git.kernel.org/stable/c/b878720e8bcaa4cf7163a5081f904dd6baf11b2c","https://git.kernel.org/stable/c/0d05b43b55d4784a42ce8fb318175f8ad7d9af5a","https://git.kernel.org/stable/c/ed0406e490f48ed180df140fe2a81be26bccb1a9","https://git.kernel.org/stable/c/f84819ef8d66931ee3998fee3c4f03230f4cb6cc"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98201.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98201","state":"PUBLISHED","datePublished":"2026-10-06T08:44:38.952Z","dateUpdated":"2026-10-19T09:15:32.269Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.324Z"},"containers":{"cna":{"title":"Input: zero ff_effect before compat copy in input_ff_effect_from_user","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2d56f3a32c0e62f99c043d2579840f9731fe5855","status":"affected","lessThan":"ed0905fda39682d3da7937184397d3276abbffa8","versionType":"git"},{"version":"2d56f3a32c0e62f99c043d2579840f9731fe5855","status":"affected","lessThan":"ec174c2ab1abb76b20fa167c6db848c3d97aa838","versionType":"git"},{"version":"2d56f3a32c0e62f99c043d2579840f9731fe5855","status":"affected","lessThan":"6c26681c5668c973bd0e951407d670ac60d9cd66","versionType":"git"},{"version":"2d56f3a32c0e62f99c043d2579840f9731fe5855","status":"affected","lessThan":"c5e573bb095d502be7cbbaa99c26a20984111c6d","versionType":"git"},{"version":"2d56f3a32c0e62f99c043d2579840f9731fe5855","status":"affected","lessThan":"b878720e8bcaa4cf7163a5081f904dd6baf11b2c","versionType":"git"},{"version":"2d56f3a32c0e62f99c043d2579840f9731fe5855","status":"affected","lessThan":"0d05b43b55d4784a42ce8fb318175f8ad7d9af5a","versionType":"git"},{"version":"2d56f3a32c0e62f99c043d2579840f9731fe5855","status":"affected","lessThan":"ed0406e490f48ed180df140fe2a81be26bccb1a9","versionType":"git"},{"version":"2d56f3a32c0e62f99c043d2579840f9731fe5855","status":"affected","lessThan":"f84819ef8d66931ee3998fee3c4f03230f4cb6cc","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/input/input-compat.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.29","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.29","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.54","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/input/input-compat.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/ed0905fda39682d3da7937184397d3276abbffa8"},{"url":"https://git.kernel.org/stable/c/ec174c2ab1abb76b20fa167c6db848c3d97aa838"},{"url":"https://git.kernel.org/stable/c/6c26681c5668c973bd0e951407d670ac60d9cd66"},{"url":"https://git.kernel.org/stable/c/c5e573bb095d502be7cbbaa99c26a20984111c6d"},{"url":"https://git.kernel.org/stable/c/b878720e8bcaa4cf7163a5081f904dd6baf11b2c"},{"url":"https://git.kernel.org/stable/c/0d05b43b55d4784a42ce8fb318175f8ad7d9af5a"},{"url":"https://git.kernel.org/stable/c/ed0406e490f48ed180df140fe2a81be26bccb1a9"},{"url":"https://git.kernel.org/stable/c/f84819ef8d66931ee3998fee3c4f03230f4cb6cc"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:15:32.269Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.18.54"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"7.2.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}