CVE-2026-98212

Use-after-free via uncanceled MMC retry work

Published Oct 6, 2026 · Updated Oct 6, 2026

Use-after-free in the Linux MMC host software queue allows context-dependent attackers to access freed kernel memory during driver removal. When request_atomic() returns -EBUSY, mmc_hsq_pump_requests() queues retry_work but does not cancel it before its devm-allocated state is freed. The race requires the sdhci-sprd driver, a busy atomic request, and host removal while retry work remains pending; the resulting dereference can destabilize the kernel.

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

What happened

Use-after-free in the Linux MMC host software queue allows context-dependent attackers to access freed kernel memory during driver removal. When request_atomic() returns -EBUSY, mmc_hsq_pump_requests() queues retry_work but does not cancel it before its devm-allocated state is freed. The race requires the sdhci-sprd driver, a busy atomic request, and host removal while retry work remains pending; the resulting dereference can destabilize the kernel.

The record

CVE
CVE-2026-98212
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
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

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Is a vulnerable build present?

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

  1. Affected versionversion=5.8
  2. Affected versionversion=6db96e5810e0a6a345b7d78549de7676ae5b2662 <45341b341642c377192c95e4d48e0a859cf85f42
  3. Affected versionversion=6db96e5810e0a6a345b7d78549de7676ae5b2662 <5d132990475f02cfa1debe03d50b479432864ebd
  4. Affected versionversion=6db96e5810e0a6a345b7d78549de7676ae5b2662 <8439bf262ce3267bcfee29d3c61605f1731a2271
  5. Affected versionversion=6db96e5810e0a6a345b7d78549de7676ae5b2662 <c50d6515bffb148c2c12be6d587ec201dfab4c34
  6. Affected versionversion=6db96e5810e0a6a345b7d78549de7676ae5b2662 <df2eb59fd9eb33663dc1053f5a4ed851e0aa1f67

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.8; version=6db96e5810e0a6a345b7d78549de7676ae5b2662 <45341b341642c377192c95e4d48e0a859cf85f42; version=6db96e5810e0a6a345b7d78549de7676ae5b2662 <5d132990475f02cfa1debe03d50b479432864ebd; version=6db96e5810e0a6a345b7d78549de7676ae5b2662 <8439bf262ce3267bcfee29d3c61605f1731a2271; version=6db96e5810e0a6a345b7d78549de7676ae5b2662 <c50d6515bffb148c2c12be6d587ec201dfab4c34; version=6db96e5810e0a6a345b7d78549de7676ae5b2662 <df2eb59fd9eb33663dc1053f5a4ed851e0aa1f67

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)
Vectorlocal
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

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Your stack

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