CVE-2026-98344Hinoki check available

DMA channel unavailability via device reference underflow

Published Oct 6, 2026 · Updated Oct 6, 2026

Reference-count underflow in the Linux kernel dmaengine subsystem allows context-dependent attackers to disrupt DMA channel discovery. dma_chan_put() drops a device reference after every client release even though dma_chan_get() acquires that reference only for the first client, exhausting the device kref. The condition requires a non-private DMA provider with a persistent client and another client cycling dmaengine_get() and dmaengine_put(); later channel lookup returns no channel while the provider remains loaded.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Reference-count underflow in the Linux kernel dmaengine subsystem allows context-dependent attackers to disrupt DMA channel discovery. dma_chan_put() drops a device reference after every client release even though dma_chan_get() acquires that reference only for the first client, exhausting the device kref. The condition requires a non-private DMA provider with a persistent client and another client cycling dmaengine_get() and dmaengine_put(); later channel lookup returns no channel while the provider remains loaded.

The record

CVE
CVE-2026-98344
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

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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=5.6
  2. Affected versionversion=8ad342a863590b24ce77681b7e081363fb3333f7 <036b527f92570206da4b8c40b38f8d689e29d0f3
  3. Affected versionversion=8ad342a863590b24ce77681b7e081363fb3333f7 <1a0d9b406febf23054ad595fd47b29325e70fb2d
  4. Affected versionversion=8ad342a863590b24ce77681b7e081363fb3333f7 <44dab659064eb5c10adb0306510eebe848ed592d
  5. Affected versionversion=8ad342a863590b24ce77681b7e081363fb3333f7 <57f7f1c6827be7d8f80feca48d2125fb91c6f6ed
  6. Affected versionversion=8ad342a863590b24ce77681b7e081363fb3333f7 <5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef
  7. Affected versionversion=8ad342a863590b24ce77681b7e081363fb3333f7 <77906ac448d2fa81fa710ae26c0e591ebdc81154
  8. Affected versionversion=8ad342a863590b24ce77681b7e081363fb3333f7 <7c3f4ce651d43705f9ec7f778f642a90d5ff4fba
  9. Affected versionversion=8ad342a863590b24ce77681b7e081363fb3333f7 <de2677e57d3161390d8a508f08cddec6ef7e4b23

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=5.6; version=8ad342a863590b24ce77681b7e081363fb3333f7 <036b527f92570206da4b8c40b38f8d689e29d0f3; version=8ad342a863590b24ce77681b7e081363fb3333f7 <1a0d9b406febf23054ad595fd47b29325e70fb2d; version=8ad342a863590b24ce77681b7e081363fb3333f7 <44dab659064eb5c10adb0306510eebe848ed592d; version=8ad342a863590b24ce77681b7e081363fb3333f7 <57f7f1c6827be7d8f80feca48d2125fb91c6f6ed; version=8ad342a863590b24ce77681b7e081363fb3333f7 <5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef; version=8ad342a863590b24ce77681b7e081363fb3333f7 <77906ac448d2fa81fa710ae26c0e591ebdc81154; version=8ad342a863590b24ce77681b7e081363fb3333f7 <7c3f4ce651d43705f9ec7f778f642a90d5ff4fba; version=8ad342a863590b24ce77681b7e081363fb3333f7 <de2677e57d3161390d8a508f08cddec6ef7e4b23

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.

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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

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Your stack

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