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CVE-2026-98201— Input: zero ff_effect before compat copy in input_ff_effect_from_user

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已修复以下漏洞： 输入：在输入子系统兼容层拷贝前将 ff_effect 结构体清零 在兼容层路径中， 函数将调用者传递的本机 结构体别名化为较小的 结构体，并且仅拷贝兼容层大小的前缀部分： 本机结构体的尾部从未被写入。调用者（例如 在处理 命令时）传递的是一个未初始化的栈上对象，因此这些字节会保留之前栈内容中的数据。随后， 会将整个本机结构体存储到 中。基于 uinput 的力反馈守护进程可以通过 接口从中读取这些数据，从而导致内核栈内存泄露至用户空间。 修复方法：在兼容层拷贝之前，先将该

AI Predicted 7.8 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1056 · Input Capture

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 2d56f3a32c0e62f99c043d2579840f9731fe5855< ed0905fda39682d3da7937184397d3276abbffa8 affected
2d56f3a32c0e62f99c043d2579840f9731fe5855< ec174c2ab1abb76b20fa167c6db848c3d97aa838 affected
2d56f3a32c0e62f99c043d2579840f9731fe5855< 6c26681c5668c973bd0e951407d670ac60d9cd66 affected
2d56f3a32c0e62f99c043d2579840f9731fe5855< c5e573bb095d502be7cbbaa99c26a20984111c6d affected
2d56f3a32c0e62f99c043d2579840f9731fe5855< b878720e8bcaa4cf7163a5081f904dd6baf11b2c affected
2d56f3a32c0e62f99c043d2579840f9731fe5855< 0d05b43b55d4784a42ce8fb318175f8ad7d9af5a affected
2d56f3a32c0e62f99c043d2579840f9731fe5855< ed0406e490f48ed180df140fe2a81be26bccb1a9 affected
2d56f3a32c0e62f99c043d2579840f9731fe5855< f84819ef8d66931ee3998fee3c4f03230f4cb6cc affected
… +10 more rows
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I. Basic Information for CVE-2026-98201

Vulnerability Information
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Vulnerability Title
Input: zero ff_effect before compat copy in input_ff_effect_from_user
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 2d56f3a32c0e62f99c043d2579840f9731fe5855 ~ ed0905fda39682d3da7937184397d3276abbffa8 -
Linux Linux 2.6.29 -

II. Public POCs for CVE-2026-98201

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III. Intelligence Information for CVE-2026-98201

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Patches & Fixes for CVE-2026-98201 (8)

Same Patch Batch · Linux · 2026-10-06 · 208 CVEs total

CVE-2026-98323 9.8 CRITICAL RDMA/siw: Bound fragmented header copies by the remaining length
CVE-2026-98365 9.8 CRITICAL RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access
CVE-2026-98282 8.8 HIGH powerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba
CVE-2026-98283 8.8 HIGH KVM: PPC: Book3S HV: fix use-after-free in kvmhv_emulate_tlbie_all_lpid()
CVE-2026-98339 8.8 HIGH wifi: cfg80211: don't filter by BSS type when removing stale entries
CVE-2026-98171 8.8 HIGH smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs
CVE-2026-98261 8.1 HIGH cifs: Fix server use-after-free in cifs_chan_skip_or_disable()
CVE-2026-98357 8.1 HIGH IB/isert: wait for deferred control PDU completions before releasing the connection
CVE-2026-98239 8.1 HIGH net: lan743x: fix RX checksum use-after-free
CVE-2026-98341 7.8 HIGH wifi: cfg80211: don't free driver-owned scan requests
CVE-2026-98324 7.8 HIGH dmaengine: pxa: fix double counting of the hw descriptors
CVE-2026-98228 7.8 HIGH mips: select CONFIG_WEAK_REORDERING_BEYOND_LLSC from CONFIG_EYEQ
CVE-2026-98229 7.8 HIGH xfrm: save input state data before secpath resets
CVE-2026-98320 7.8 HIGH netfilter: flowtable: hold reference on ct until flow is released
CVE-2026-98318 7.8 HIGH smb: client: validate absolute native symlink targets before NT fixups
CVE-2026-98315 7.8 HIGH ntfs: protect runlist updates with the runlist lock
CVE-2026-98260 7.8 HIGH exec: Cleanup POSIX timers right after de_thread()
CVE-2026-98256 7.8 HIGH signal: Prevent exec() race
CVE-2026-98258 7.8 HIGH posix-cpu-timers: Prevent freeing a timer which is queued on the expiry list
CVE-2026-98254 7.8 HIGH swiotlb: use the adjusted address for the highmem page lookup

Showing top 20 of 208 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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