CVE-2026-89856Hinoki check available

Kernel crash via truncated MSI-X queue count

Published Sep 16, 2026 · Updated Sep 16, 2026

Integer truncation in Linux qla2xxx allows physically proximate attackers to crash the kernel through crafted MSI-X vector counts. Queue derivation stores msix_count minus one in u8 fields, so values of 1 or 257 become zero; qla2x00_alloc_queues then accepts ZERO_SIZE_PTR and writes through it. Exploitation requires a QLogic-compatible board or malicious hot-plugged device advertising the triggering vector count, and the result is kernel memory corruption or a crash.

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

Integer truncation in Linux qla2xxx allows physically proximate attackers to crash the kernel through crafted MSI-X vector counts. Queue derivation stores msix_count minus one in u8 fields, so values of 1 or 257 become zero; qla2x00_alloc_queues then accepts ZERO_SIZE_PTR and writes through it. Exploitation requires a QLogic-compatible board or malicious hot-plugged device advertising the triggering vector count, and the result is kernel memory corruption or a crash.

The record

CVE
CVE-2026-89856
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
physical
Privileges
unauthenticated

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=4.10
  2. Affected versionversion=d74595278f4ab192af66d9e60a9087464638beee <2efe50b2da829909023de4a2eb87badb7cfa53cc
  3. Affected versionversion=d74595278f4ab192af66d9e60a9087464638beee <33c77254e6e91f37c72c7fad4051777452b10de8
  4. Affected versionversion=d74595278f4ab192af66d9e60a9087464638beee <7a448f5ed0b283dbde4e9183dd1e98c221432dab
  5. Affected versionversion=d74595278f4ab192af66d9e60a9087464638beee <802068b9b683b8008fcccbf6e9ad133e597ec87c
  6. Affected versionversion=d74595278f4ab192af66d9e60a9087464638beee <9eeddbeaa896f39d943644b16d83a6ad0ceab255
  7. Affected versionversion=d74595278f4ab192af66d9e60a9087464638beee <cf623d32761b00f221a9cfded3303d56e84b429d
  8. Affected versionversion=d74595278f4ab192af66d9e60a9087464638beee <e80adfeac61b4d5db7ffe0f5af43999c33a4145e
  9. Affected versionversion=d74595278f4ab192af66d9e60a9087464638beee <ebfd35c64433821bd5619a6d07ccc2df8b5b1de3

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.10; version=d74595278f4ab192af66d9e60a9087464638beee <2efe50b2da829909023de4a2eb87badb7cfa53cc; version=d74595278f4ab192af66d9e60a9087464638beee <33c77254e6e91f37c72c7fad4051777452b10de8; version=d74595278f4ab192af66d9e60a9087464638beee <7a448f5ed0b283dbde4e9183dd1e98c221432dab; version=d74595278f4ab192af66d9e60a9087464638beee <802068b9b683b8008fcccbf6e9ad133e597ec87c; version=d74595278f4ab192af66d9e60a9087464638beee <9eeddbeaa896f39d943644b16d83a6ad0ceab255; version=d74595278f4ab192af66d9e60a9087464638beee <cf623d32761b00f221a9cfded3303d56e84b429d; version=d74595278f4ab192af66d9e60a9087464638beee <e80adfeac61b4d5db7ffe0f5af43999c33a4145e; version=d74595278f4ab192af66d9e60a9087464638beee <ebfd35c64433821bd5619a6d07ccc2df8b5b1de3

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

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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