CVE-2026-89777Hinoki check available

Host crash via stale VFIO MSI pointer

Published Sep 16, 2026 · Updated Sep 16, 2026

Use-after-free in Linux kernel VFIO PCI code allows local users to crash the host through repeated device open and MSI access. On an allocation failure, vfio_msi_cap_len() frees vdev->msi_perm without clearing it, so a later open reuses the dangling table and calls freed handlers. Exploitation requires access to a VFIO-assigned PCI device and an initialization allocation failure; subsequent access or close causes a kernel panic or double-free.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free in Linux kernel VFIO PCI code allows local users to crash the host through repeated device open and MSI access. On an allocation failure, vfio_msi_cap_len() frees vdev->msi_perm without clearing it, so a later open reuses the dangling table and calls freed handlers. Exploitation requires access to a VFIO-assigned PCI device and an initialization allocation failure; subsequent access or close causes a kernel panic or double-free.

The record

CVE
CVE-2026-89777
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

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=30ea32ab1951c80c6113f300fce2c70cd12659e4 <25cdd2a492d868cff1e519a60fe282909c52d385
  2. Affected versionversion=30ea32ab1951c80c6113f300fce2c70cd12659e4 <533d0c5feef85ee6404b9f41d5564fac6971a008
  3. Affected versionversion=30ea32ab1951c80c6113f300fce2c70cd12659e4 <812f1db7f0755a19ef16ecdc5cec51bcabc5eda5
  4. Affected versionversion=30ea32ab1951c80c6113f300fce2c70cd12659e4 <d665a1688af7f8fefd7c0eb04f2a37122ce007f4
  5. Affected versionversion=30ea32ab1951c80c6113f300fce2c70cd12659e4 <dc77acfeb979dded39b247b60fef0399536bfa77
  6. Affected versionversion=30ea32ab1951c80c6113f300fce2c70cd12659e4 <eb84cd81040e58dd05ac190f561f2115e3367249
  7. Affected versionversion=30ea32ab1951c80c6113f300fce2c70cd12659e4 <f0eea8f9013676b42289ec35941e848b8a543e19
  8. Affected versionversion=30ea32ab1951c80c6113f300fce2c70cd12659e4 <fda8fb7e8179561693a786a7af593f6b944a21c1
  9. Affected versionversion=4.14.155 <4.15
  10. Affected versionversion=4.19.85 <4.20
  11. Affected versionversion=4.20
  12. Affected versionversion=4.4.203 <4.5
  13. Affected versionversion=4.9.203 <4.10
  14. Affected versionversion=ac370e3d1f3b01519d2705cd5815d1c9d0a8812b
  15. Affected versionversion=be363e27ec3c3a99793da2be6c07eafb95709c6b
  16. Affected versionversion=dde3433de9a067a33d67d65b9093cad3e043e49e
  17. Affected versionversion=f1b10ba5739440ca51d66f0b2949cead88d2dd02

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=30ea32ab1951c80c6113f300fce2c70cd12659e4 <25cdd2a492d868cff1e519a60fe282909c52d385; version=30ea32ab1951c80c6113f300fce2c70cd12659e4 <533d0c5feef85ee6404b9f41d5564fac6971a008; version=30ea32ab1951c80c6113f300fce2c70cd12659e4 <812f1db7f0755a19ef16ecdc5cec51bcabc5eda5; version=30ea32ab1951c80c6113f300fce2c70cd12659e4 <d665a1688af7f8fefd7c0eb04f2a37122ce007f4; version=30ea32ab1951c80c6113f300fce2c70cd12659e4 <dc77acfeb979dded39b247b60fef0399536bfa77; version=30ea32ab1951c80c6113f300fce2c70cd12659e4 <eb84cd81040e58dd05ac190f561f2115e3367249; version=30ea32ab1951c80c6113f300fce2c70cd12659e4 <f0eea8f9013676b42289ec35941e848b8a543e19; version=30ea32ab1951c80c6113f300fce2c70cd12659e4 <fda8fb7e8179561693a786a7af593f6b944a21c1; version=4.14.155 <4.15; version=4.19.85 <4.20; version=4.20; version=4.4.203 <4.5; version=4.9.203 <4.10; version=ac370e3d1f3b01519d2705cd5815d1c9d0a8812b; version=be363e27ec3c3a99793da2be6c07eafb95709c6b; version=dde3433de9a067a33d67d65b9093cad3e043e49e; version=f1b10ba5739440ca51d66f0b2949cead88d2dd02

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)
Vectorlocal
Privilegesauthenticated
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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