CVE-2024-55916

Kernel panic via premature Hyper-V channel callback

Published Jan 11, 2025 · Updated May 11, 2026

NULL pointer dereference in Linux Hyper-V utilities allows local users to crash affected kernels by racing KVP or VSS startup. A daemon can register through its character device before util_probe() finishes vmbus_open(), causing kvp_register_done() to invoke a callback that dereferences an uninitialized ring buffer. Triggering the race requires local low-privilege access to a Hyper-V guest using KVP or VSS, and the bounded consequence is a kernel panic and service interruption.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux Hyper-V utilities allows local users to crash affected kernels by racing KVP or VSS startup. A daemon can register through its character device before util_probe() finishes vmbus_open(), causing kvp_register_done() to invoke a callback that dereferences an uninitialized ring buffer. Triggering the race requires local low-privilege access to a Hyper-V guest using KVP or VSS, and the bounded consequence is a kernel panic and service interruption.

The record

CVE
CVE-2024-55916
Published
Jan 11, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 11, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.9
  2. Affected versionversion=e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c <042253c57be901bfd19f15b68267442b70f510d5
  3. Affected versionversion=e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c <07a756a49f4b4290b49ea46e089cbe6f79ff8d26
  4. Affected versionversion=e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c <3dd7a30c6d7f90afcf19e9b072f572ba524d7ec6
  5. Affected versionversion=e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c <718fe694a334be9d1a89eed22602369ac18d6583
  6. Affected versionversion=e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c <89fcec5e466b3ac9b376e0d621c71effa1a7983f
  7. Affected versionversion=e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c <d81f4e73aff9b861671df60e5100ad25cc16fbf8
  8. Affected versionversion=e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c <f091a224a2c82f1e302b1768d73bb6332f687321

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.9; version=e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c <042253c57be901bfd19f15b68267442b70f510d5; version=e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c <07a756a49f4b4290b49ea46e089cbe6f79ff8d26; version=e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c <3dd7a30c6d7f90afcf19e9b072f572ba524d7ec6; version=e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c <718fe694a334be9d1a89eed22602369ac18d6583; version=e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c <89fcec5e466b3ac9b376e0d621c71effa1a7983f; version=e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c <d81f4e73aff9b861671df60e5100ad25cc16fbf8; version=e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c <f091a224a2c82f1e302b1768d73bb6332f687321

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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

CWE-476NULL Pointer Dereference
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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