CVE-2026-80659

Command-processing hang via recursive mutex acquisition

Published Aug 28, 2026 · Updated Aug 28, 2026

Deadlock in the Linux vub300 MMC driver allows attackers to hang command processing when a command response times out during USB reset. The timeout path calls usb_reset_device() while vub300_cmndwork_thread() still holds cmd_mutex, and vub300_pre_reset() recursively acquires that mutex. Reachability requires an active VUB300 command and a response timeout; the demonstrated consequence is a deadlocked driver workqueue rather than code execution or data access.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deadlock in the Linux vub300 MMC driver allows attackers to hang command processing when a command response times out during USB reset. The timeout path calls usb_reset_device() while vub300_cmndwork_thread() still holds cmd_mutex, and vub300_pre_reset() recursively acquires that mutex. Reachability requires an active VUB300 command and a response timeout; the demonstrated consequence is a deadlocked driver workqueue rather than code execution or data access.

The record

CVE
CVE-2026-80659
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 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=3.0
  2. Affected versionversion=88095e7b473a3d9ec3b9c60429576e9cbd327c89 <2e6b9a394206c76dd417c991312f349435ef35e6
  3. Affected versionversion=88095e7b473a3d9ec3b9c60429576e9cbd327c89 <7ee7a77ec2f446109ab52cc80ace7acc22ab6211
  4. Affected versionversion=88095e7b473a3d9ec3b9c60429576e9cbd327c89 <8344611477c9241f45f20981990780fc5f0996f8
  5. Affected versionversion=88095e7b473a3d9ec3b9c60429576e9cbd327c89 <8672b8bdbd2063b3fcbd75f729e4706fcdad2257
  6. Affected versionversion=88095e7b473a3d9ec3b9c60429576e9cbd327c89 <9f5e04235a0b59e6e30af9f45511addf2604d757
  7. Affected versionversion=88095e7b473a3d9ec3b9c60429576e9cbd327c89 <bf9848a22a8e50d39d5e8d871581f0a8110f16b3
  8. Affected versionversion=88095e7b473a3d9ec3b9c60429576e9cbd327c89 <c2e1d33929565fa14c48d8a5a45edc3ebfc941b2
  9. Affected versionversion=88095e7b473a3d9ec3b9c60429576e9cbd327c89 <ee5fb641c4ccac8406c668d3e947eb20ce44f233

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=3.0; version=88095e7b473a3d9ec3b9c60429576e9cbd327c89 <2e6b9a394206c76dd417c991312f349435ef35e6; version=88095e7b473a3d9ec3b9c60429576e9cbd327c89 <7ee7a77ec2f446109ab52cc80ace7acc22ab6211; version=88095e7b473a3d9ec3b9c60429576e9cbd327c89 <8344611477c9241f45f20981990780fc5f0996f8; version=88095e7b473a3d9ec3b9c60429576e9cbd327c89 <8672b8bdbd2063b3fcbd75f729e4706fcdad2257; version=88095e7b473a3d9ec3b9c60429576e9cbd327c89 <9f5e04235a0b59e6e30af9f45511addf2604d757; version=88095e7b473a3d9ec3b9c60429576e9cbd327c89 <bf9848a22a8e50d39d5e8d871581f0a8110f16b3; version=88095e7b473a3d9ec3b9c60429576e9cbd327c89 <c2e1d33929565fa14c48d8a5a45edc3ebfc941b2; version=88095e7b473a3d9ec3b9c60429576e9cbd327c89 <ee5fb641c4ccac8406c668d3e947eb20ce44f233

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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