Input: zero ff_effect before compat copy in input_ff_effect_from_user
In the Linux kernel, the following vulnerability has been resolved: Input: zero ff_effect before compat copy in input_ff_effect_from_user In the compat path input_ff_effect_from_user() aliases the caller's native struct ff_effect with the smaller struct ff_effect_compat and copies only the compat sized prefix: compat_effect = (struct ff_effect_compat *)effect; if (copy_from_user(compat_effect, buffer, sizeof(struct ff_effect_compat))) The tail of the native structure is never written. Callers pass an uninitialized on-stack object, for example evdev_do_ioctl() for EVIOCSFF, so those bytes keep their previous stack contents. input_ff_upload() then stores the full native structure in ff->effects[id], from where a uinput based force feedback daemon can read it back via UI_BEGIN_FF_UPLOAD, disclosing kernel stack memory to userspace. Zero the effect before the compat copy.
CVE-2026-98201
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98201
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2d56f3a32c0e62f99c043d2579840f9731fe5855",
"lessThan": "ed0905fda39682d3da7937184397d3276abbffa8",
"versionType": "git"
},
{
"status": "affected",
"version": "2d56f3a32c0e62f99c043d2579840f9731fe5855",
"lessThan": "ec174c2ab1abb76b20fa167c6db848c3d97aa838",
"versionType": "git"
},
{
"status": "affected",
"version": "2d56f3a32c0e62f99c043d2579840f9731fe5855",
"lessThan": "6c26681c5668c973bd0e951407d670ac60d9cd66",
"versionType": "git"
},
{
"status": "affected",
"version": "2d56f3a32c0e62f99c043d2579840f9731fe5855",
"lessThan": "c5e573bb095d502be7cbbaa99c26a20984111c6d",
"versionType": "git"
},
{
"status": "affected",
"version": "2d56f3a32c0e62f99c043d2579840f9731fe5855",
"lessThan": "b878720e8bcaa4cf7163a5081f904dd6baf11b2c",
"versionType": "git"
},
{
"status": "affected",
"version": "2d56f3a32c0e62f99c043d2579840f9731fe5855",
"lessThan": "0d05b43b55d4784a42ce8fb318175f8ad7d9af5a",
"versionType": "git"
},
{
"status": "affected",
"version": "2d56f3a32c0e62f99c043d2579840f9731fe5855",
"lessThan": "ed0406e490f48ed180df140fe2a81be26bccb1a9",
"versionType": "git"
},
{
"status": "affected",
"version": "2d56f3a32c0e62f99c043d2579840f9731fe5855",
"lessThan": "f84819ef8d66931ee3998fee3c4f03230f4cb6cc",
"versionType": "git"
}
],
"programFiles": [
"drivers/input/input-compat.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.29"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.29",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.54",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.8",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/input/input-compat.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98201
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38281 · Revision 1
- Added to Heist Feed
- Publisher date