CVE-2026-98211

Invalid memory access via uncanceled busy-timeout work

Published Oct 6, 2026 · Updated Oct 6, 2026

Use-after-free in the Linux kernel MMCI host driver allows stale timeout work to access freed host memory during device removal. The mmci_remove() path fails to cancel work queued by ux500_busy_complete() for an R1b command, so the worker can dereference a released mmci_host. The condition requires a busy-detect controller variant and removal while timeout work remains queued; attacker control and consequences beyond invalid memory access are not established.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

Use-after-free in the Linux kernel MMCI host driver allows stale timeout work to access freed host memory during device removal. The mmci_remove() path fails to cancel work queued by ux500_busy_complete() for an R1b command, so the worker can dereference a released mmci_host. The condition requires a busy-detect controller variant and removal while timeout work remains queued; attacker control and consequences beyond invalid memory access are not established.

The record

CVE
CVE-2026-98211
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.5
  2. Affected versionversion=b1a665932dc23cad0b8af2745cd9713f9e930d63 <2b19cf3e50cddaff07b657dae1a8f30f06032852
  3. Affected versionversion=b1a665932dc23cad0b8af2745cd9713f9e930d63 <432b98c1f5daecf04a33c8e1688d26e7ac221e23
  4. Affected versionversion=b1a665932dc23cad0b8af2745cd9713f9e930d63 <7fecf79f31568de161be14911db10d1251617b01
  5. Affected versionversion=b1a665932dc23cad0b8af2745cd9713f9e930d63 <af6fbf72e899932f330c4e5d0b84d985c922c633

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.5; version=b1a665932dc23cad0b8af2745cd9713f9e930d63 <2b19cf3e50cddaff07b657dae1a8f30f06032852; version=b1a665932dc23cad0b8af2745cd9713f9e930d63 <432b98c1f5daecf04a33c8e1688d26e7ac221e23; version=b1a665932dc23cad0b8af2745cd9713f9e930d63 <7fecf79f31568de161be14911db10d1251617b01; version=b1a665932dc23cad0b8af2745cd9713f9e930d63 <af6fbf72e899932f330c4e5d0b84d985c922c633

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Get started