CVE-2026-74754

Local denial of service via SCSI PM race

Published Aug 26, 2026 · Updated Aug 26, 2026

Race condition in the Linux kernel SCSI core from 3.3 through 7.1.9 allows local users to trigger a runtime PM usage-count underflow. scsi_error_handler reads shost->eh_noresume separately before scsi_autopm_get_host and scsi_autopm_put_host, so a concurrent UFS power transition can skip the get but execute the put. Triggering requires a PM-induced UFS error to overlap SCSI error handling; the unmatched put can destabilize the kernel or crash the system.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux kernel SCSI core from 3.3 through 7.1.9 allows local users to trigger a runtime PM usage-count underflow. scsi_error_handler reads shost->eh_noresume separately before scsi_autopm_get_host and scsi_autopm_put_host, so a concurrent UFS power transition can skip the get but execute the put. Triggering requires a PM-induced UFS error to overlap SCSI error handling; the unmatched put can destabilize the kernel or crash the system.

The record

CVE
CVE-2026-74754
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-911, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 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=3.3
  2. Affected versionversion=ae0751ffc77e7f21629970fdab5528c573e637f8 <872f486259ae0bc6b73ca4735a15d013241f73e9
  3. Affected versionversion=ae0751ffc77e7f21629970fdab5528c573e637f8 <e83eed1bea142c8fe852fd53156845b88252ecd8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.3; version=ae0751ffc77e7f21629970fdab5528c573e637f8 <872f486259ae0bc6b73ca4735a15d013241f73e9; version=ae0751ffc77e7f21629970fdab5528c573e637f8 <e83eed1bea142c8fe852fd53156845b88252ecd8

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/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-911Improper Update of Reference Count
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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