CVE-2026-74555

Disk denial of service via resume race

Published Aug 15, 2026 · Updated Aug 15, 2026

Race condition in Linux kernel libsas resume handling allows local users to disable SAS disks through a host suspend-and-resume cycle. On hisi_sas, sas_resume_ha_no_sync returns before PHY UP and discovery work completes, allowing controller autosuspend while disks are still waking. The published assessment requires local low-privileged access and affected HiSilicon SAS hardware; ensuing I/O fails and disks become disabled.

CVSS severity5.5
Medium
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

Race condition in Linux kernel libsas resume handling allows local users to disable SAS disks through a host suspend-and-resume cycle. On hisi_sas, sas_resume_ha_no_sync returns before PHY UP and discovery work completes, allowing controller autosuspend while disks are still waking. The published assessment requires local low-privileged access and affected HiSilicon SAS hardware; ensuing I/O fails and disks become disabled.

The record

CVE
CVE-2026-74555
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-833, T1499
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=5.17
  2. Affected versionversion=fbefe22811c3140a686e407e114789ebf328a9a2 <3dbbbf656b850c9c8de05df6ad4a1dfc6ff02845
  3. Affected versionversion=fbefe22811c3140a686e407e114789ebf328a9a2 <9e24b47ef81d43b3fb1b14294f09991640c79fcc
  4. Affected versionversion=fbefe22811c3140a686e407e114789ebf328a9a2 <b9c44a14062093e9fc2d6bddc696cfceadb482d7
  5. Affected versionversion=fbefe22811c3140a686e407e114789ebf328a9a2 <c391b5899dd46485a5893696c12ae3e95a3a7325
  6. Affected versionversion=fbefe22811c3140a686e407e114789ebf328a9a2 <e50a6523a603594a6d92cdecfe11997d639410a3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.17; version=fbefe22811c3140a686e407e114789ebf328a9a2 <3dbbbf656b850c9c8de05df6ad4a1dfc6ff02845; version=fbefe22811c3140a686e407e114789ebf328a9a2 <9e24b47ef81d43b3fb1b14294f09991640c79fcc; version=fbefe22811c3140a686e407e114789ebf328a9a2 <b9c44a14062093e9fc2d6bddc696cfceadb482d7; version=fbefe22811c3140a686e407e114789ebf328a9a2 <c391b5899dd46485a5893696c12ae3e95a3a7325; version=fbefe22811c3140a686e407e114789ebf328a9a2 <e50a6523a603594a6d92cdecfe11997d639410a3

Published CVSS scores

4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Oracle LinuxCVSS: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-833Deadlock
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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