CVE-2024-46791

Device initialization hang via interrupt-handler deadlock

Published Sep 18, 2024 · Updated May 11, 2026

Improper locking in the Linux mcp251x CAN driver allows attackers to hang device initialization when an interrupt races with opening. mcp251x_open holds mcp_lock while mcp251x_hw_wake calls disable_irq, which waits for mcp251x_can_ist even when that handler is blocked on the same mutex. Reachability requires an MCP251x CAN controller and the narrow timing window in which its interrupt handler begins while the interface is opening; the resulting deadlock prevents the open operation from completing.

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

What happened

Improper locking in the Linux mcp251x CAN driver allows attackers to hang device initialization when an interrupt races with opening. mcp251x_open holds mcp_lock while mcp251x_hw_wake calls disable_irq, which waits for mcp251x_can_ist even when that handler is blocked on the same mutex. Reachability requires an MCP251x CAN controller and the narrow timing window in which its interrupt handler begins while the interface is opening; the resulting deadlock prevents the open operation from completing.

The record

CVE
CVE-2024-46791
Published
Sep 18, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 18, 2024CVE 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

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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=5.5
  2. Affected versionversion=8ce8c0abcba314e1fe954a1840f6568bf5aef2ef <3a49b6b1caf5cefc05264d29079d52c99cb188e0
  3. Affected versionversion=8ce8c0abcba314e1fe954a1840f6568bf5aef2ef <513c8fc189b52f7922e36bdca58997482b198f0e
  4. Affected versionversion=8ce8c0abcba314e1fe954a1840f6568bf5aef2ef <7dd9c26bd6cf679bcfdef01a8659791aa6487a29
  5. Affected versionversion=8ce8c0abcba314e1fe954a1840f6568bf5aef2ef <8fecde9c3f9a4b97b68bb97c9f47e5b662586ba7
  6. Affected versionversion=8ce8c0abcba314e1fe954a1840f6568bf5aef2ef <e554113a1cd2a9cfc6c7af7bdea2141c5757e188
  7. Affected versionversion=8ce8c0abcba314e1fe954a1840f6568bf5aef2ef <f7ab9e14b23a3eac6714bdc4dba244d8aa1ef646

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=5.5; version=8ce8c0abcba314e1fe954a1840f6568bf5aef2ef <3a49b6b1caf5cefc05264d29079d52c99cb188e0; version=8ce8c0abcba314e1fe954a1840f6568bf5aef2ef <513c8fc189b52f7922e36bdca58997482b198f0e; version=8ce8c0abcba314e1fe954a1840f6568bf5aef2ef <7dd9c26bd6cf679bcfdef01a8659791aa6487a29; version=8ce8c0abcba314e1fe954a1840f6568bf5aef2ef <8fecde9c3f9a4b97b68bb97c9f47e5b662586ba7; version=8ce8c0abcba314e1fe954a1840f6568bf5aef2ef <e554113a1cd2a9cfc6c7af7bdea2141c5757e188; version=8ce8c0abcba314e1fe954a1840f6568bf5aef2ef <f7ab9e14b23a3eac6714bdc4dba244d8aa1ef646

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

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Technologies

Your stack

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Your stack

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