CVE-2026-74472

Kernel crash via unsanitized ublk device state

Published Aug 15, 2026 · Updated Aug 15, 2026

Kernel state validation failure in affected Linux kernels allows local users to crash the system through crafted ublk device information. ublk_ctrl_add_dev() copies ublksrv_ctrl_dev_info from userspace but fails to reset the kernel-owned state and ublksrv_pid fields, allowing an unattached device to be treated as live. Access to the ublk control interface is required; crafted state can trigger a kernel oops, wedge device startup, route operations to a device that never started, or misreport the server process.

CVSS severity7.0
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Kernel state validation failure in affected Linux kernels allows local users to crash the system through crafted ublk device information. ublk_ctrl_add_dev() copies ublksrv_ctrl_dev_info from userspace but fails to reset the kernel-owned state and ublksrv_pid fields, allowing an unattached device to be treated as live. Access to the ublk control interface is required; crafted state can trigger a kernel oops, wedge device startup, route operations to a device that never started, or misreport the server process.

The record

CVE
CVE-2026-74472
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-824, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=6.0
  2. Affected versionversion=6d9e6dfdf3b207701471f364121c67eefb000682 <127033b79383a3e78361d7e971588aa8849f5124
  3. Affected versionversion=6d9e6dfdf3b207701471f364121c67eefb000682 <205feb72e5beb3140e4e1403b6cff30cf739bab9
  4. Affected versionversion=6d9e6dfdf3b207701471f364121c67eefb000682 <b67ce16b26ad0f14cfd6071013840aa95f823bea
  5. Affected versionversion=6d9e6dfdf3b207701471f364121c67eefb000682 <e65848e4ce352bac9e3465099354c8b8f845391f
  6. Affected versionversion=6d9e6dfdf3b207701471f364121c67eefb000682 <ee41b00858ca65b4428e99efe39a4277c1f043d2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.0; version=6d9e6dfdf3b207701471f364121c67eefb000682 <127033b79383a3e78361d7e971588aa8849f5124; version=6d9e6dfdf3b207701471f364121c67eefb000682 <205feb72e5beb3140e4e1403b6cff30cf739bab9; version=6d9e6dfdf3b207701471f364121c67eefb000682 <b67ce16b26ad0f14cfd6071013840aa95f823bea; version=6d9e6dfdf3b207701471f364121c67eefb000682 <e65848e4ce352bac9e3465099354c8b8f845391f; version=6d9e6dfdf3b207701471f364121c67eefb000682 <ee41b00858ca65b4428e99efe39a4277c1f043d2

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-824Access of Uninitialized Pointer
T1499.004Endpoint Denial of Service: Application 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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