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CVE.org (no NVD analysis yet)· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 0d05b43b55d4784a42ce8fb318175f8ad7d9af5a, 6c26681c5668c973bd0e951407d670ac60d9cd66, b878720e8bcaa4cf7163a5081f904dd6baf11b2c; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.

Low priority for now. Upgrade to Linux Linux 0d05b43b55d4784a42ce8fb318175f8ad7d9af5a, 6c26681c5668c973bd0e951407d670ac60d9cd66, b878720e8bcaa4cf7163a5081f904dd6baf11b2c; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Oct 6, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.29affected
    • 2d56f3a32c0e62f99c043d2579840f9731fe5855 and later · before ed0905fda39682d3da7937184397d3276abbffa8affected · git
    • 2d56f3a32c0e62f99c043d2579840f9731fe5855 and later · before ec174c2ab1abb76b20fa167c6db848c3d97aa838affected · git
    • 2d56f3a32c0e62f99c043d2579840f9731fe5855 and later · before 6c26681c5668c973bd0e951407d670ac60d9cd66affected · git
    • 2d56f3a32c0e62f99c043d2579840f9731fe5855 and later · before c5e573bb095d502be7cbbaa99c26a20984111c6daffected · git
    • 2d56f3a32c0e62f99c043d2579840f9731fe5855 and later · before b878720e8bcaa4cf7163a5081f904dd6baf11b2caffected · git
    • 2d56f3a32c0e62f99c043d2579840f9731fe5855 and later · before 0d05b43b55d4784a42ce8fb318175f8ad7d9af5aaffected · git
    • 2d56f3a32c0e62f99c043d2579840f9731fe5855 and later · before ed0406e490f48ed180df140fe2a81be26bccb1a9affected · git
    • 2d56f3a32c0e62f99c043d2579840f9731fe5855 and later · before f84819ef8d66931ee3998fee3c4f03230f4cb6ccaffected · git
    • before 2.6.29not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.8-17.2.8-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-98199Oct 6, 2026 · hwmon: (pmbus/core) increase number of phases and add new mask
    0Monitor
  • ← EarlierCVE-2026-98200Oct 6, 2026 · hwmon: (hp-wmi-sensors) Fix use-after-free in fungible_show()
    0Monitor
  • Later →CVE-2026-98202Oct 6, 2026 · Input: synaptics-rmi4 - fix GPF in suspend and resume when unbound
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0d05b43b55d4784a42ce8fb318175f8ad7d9af5aVendor (CNA)
Linux Linux6c26681c5668c973bd0e951407d670ac60d9cd66Vendor (CNA)
Linux Linuxb878720e8bcaa4cf7163a5081f904dd6baf11b2cVendor (CNA)
Linux Linuxc5e573bb095d502be7cbbaa99c26a20984111c6dVendor (CNA)
Linux Linuxec174c2ab1abb76b20fa167c6db848c3d97aa838Vendor (CNA)
Linux Linuxed0406e490f48ed180df140fe2a81be26bccb1a9Vendor (CNA)
Linux Linuxed0905fda39682d3da7937184397d3276abbffa8Vendor (CNA)
Linux Linuxf84819ef8d66931ee3998fee3c4f03230f4cb6ccVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux7.2.8-1 · Debian:14Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayOct 29, 2026+23 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Exploit maturity— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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