CVE-2026-74526

System hang via reclaim during blocked I/O

Published Aug 15, 2026 · Updated Aug 15, 2026

Deadlock in the mpi3mr SCSI driver in the Linux kernel allows local users to hang the system during fault handling. mpi3mr_fault_uevent_emit performs GFP_KERNEL allocations directly and through kobject_uevent_env while host I/O is already blocked, allowing reclaim to wait on that same I/O. The path is limited to fault-watchdog or reset processing, and successful exploitation interrupts host availability without reported data disclosure or modification.

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

Deadlock in the mpi3mr SCSI driver in the Linux kernel allows local users to hang the system during fault handling. mpi3mr_fault_uevent_emit performs GFP_KERNEL allocations directly and through kobject_uevent_env while host I/O is already blocked, allowing reclaim to wait on that same I/O. The path is limited to fault-watchdog or reset processing, and successful exploitation interrupts host availability without reported data disclosure or modification.

The record

CVE
CVE-2026-74526
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-833, 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=7.0
  2. Affected versionversion=ec54b348f274fdd2bd32bbe74de6d62ae1a10a18 <ccff8c92571500fcfed21281e33daaf645bf692f
  3. Affected versionversion=ec54b348f274fdd2bd32bbe74de6d62ae1a10a18 <df817b19dac7034416d18f14347010b3e9f5cf3d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=7.0; version=ec54b348f274fdd2bd32bbe74de6d62ae1a10a18 <ccff8c92571500fcfed21281e33daaf645bf692f; version=ec54b348f274fdd2bd32bbe74de6d62ae1a10a18 <df817b19dac7034416d18f14347010b3e9f5cf3d

Published CVSS scores

4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Red HatCVSS: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
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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