CVE-2026-89993Hinoki check available

Kernel crash via uninitialized IRQ back pointer

Published Sep 16, 2026 · Updated Sep 16, 2026

NULL pointer dereference in affected Linux kernels allows attackers to crash the system via a shared dw-edma interrupt. dw_edma_irq_request() installs each handler before setting the struct dw_edma_irq back pointer, so an early interrupt passes a NULL dw value to the handler. The race requires a system using the Synopsys eDMA driver and an interrupt during handler setup; successful triggering interrupts the entire host.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

NULL pointer dereference in affected Linux kernels allows attackers to crash the system via a shared dw-edma interrupt. dw_edma_irq_request() installs each handler before setting the struct dw_edma_irq back pointer, so an early interrupt passes a NULL dw value to the handler. The race requires a system using the Synopsys eDMA driver and an interrupt during handler setup; successful triggering interrupts the entire host.

The record

CVE
CVE-2026-89993
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=5.3
  2. Affected versionversion=e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf <07e50cef557def076418c67051a336e4c6bd50e1
  3. Affected versionversion=e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf <17ef63843c0fcbf1efdfbbfb0f5584a5ea2c91ba
  4. Affected versionversion=e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf <647217abea849d3d45f8cb0b8ee5b78d50f26985
  5. Affected versionversion=e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf <b86280b12ccf33b68b309b7cb0e4476894dfe77c
  6. Affected versionversion=e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf <d232bc6cf4562132ef50644484dfd4b23a593295
  7. Affected versionversion=e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf <d91fb6c0d10dad32929dc5c6850f89df34e1bfcd
  8. Affected versionversion=e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf <fac202d73e7a649b7d4010325c6c6dcd9334fe65

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=5.3; version=e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf <07e50cef557def076418c67051a336e4c6bd50e1; version=e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf <17ef63843c0fcbf1efdfbbfb0f5584a5ea2c91ba; version=e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf <647217abea849d3d45f8cb0b8ee5b78d50f26985; version=e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf <b86280b12ccf33b68b309b7cb0e4476894dfe77c; version=e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf <d232bc6cf4562132ef50644484dfd4b23a593295; version=e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf <d91fb6c0d10dad32929dc5c6850f89df34e1bfcd; version=e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf <fac202d73e7a649b7d4010325c6c6dcd9334fe65

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

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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