CVE-2024-46735

Kernel crash via repeated ublk recovery commands

Published Sep 18, 2024 · Updated May 11, 2026

A NULL pointer dereference in the Linux ublk driver allows local users to crash the kernel through recovery commands. The first of two UBLK_CMD_START_USER_RECOVERY requests clears ubq->ubq_daemon; the second reaches ublk_queue_reinit and dereferences it because ublk_ctrl_start_recovery accepts zero ready queues. Low-privileged local access to the ublk control path is required, and successful exploitation interrupts the host by crashing its kernel.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A NULL pointer dereference in the Linux ublk driver allows local users to crash the kernel through recovery commands. The first of two UBLK_CMD_START_USER_RECOVERY requests clears ubq->ubq_daemon; the second reaches ublk_queue_reinit and dereferences it because ublk_ctrl_start_recovery accepts zero ready queues. Low-privileged local access to the ublk control path is required, and successful exploitation interrupts the host by crashing its kernel.

The record

CVE
CVE-2024-46735
Published
Sep 18, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

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=6.1
  2. Affected versionversion=c732a852b419fa057b53657e2daaf9433940391c <136a29d8112df4ea0a57f9602ddf3579e04089dc
  3. Affected versionversion=c732a852b419fa057b53657e2daaf9433940391c <7c890ef60bf417d3fe5c6f7a9f6cef0e1d77f74f
  4. Affected versionversion=c732a852b419fa057b53657e2daaf9433940391c <ca249435893dda766f3845c15ca77ca5672022d8
  5. Affected versionversion=c732a852b419fa057b53657e2daaf9433940391c <e58f5142f88320a5b1449f96a146f2f24615c5c7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.1; version=c732a852b419fa057b53657e2daaf9433940391c <136a29d8112df4ea0a57f9602ddf3579e04089dc; version=c732a852b419fa057b53657e2daaf9433940391c <7c890ef60bf417d3fe5c6f7a9f6cef0e1d77f74f; version=c732a852b419fa057b53657e2daaf9433940391c <ca249435893dda766f3845c15ca77ca5672022d8; version=c732a852b419fa057b53657e2daaf9433940391c <e58f5142f88320a5b1449f96a146f2f24615c5c7

Published CVSS scores

5.5CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NISTCVSS: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

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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
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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