CVE-2026-72202Network attack vector

Filesystem-operation hangs via missed allocation-failure wakeup

Published Aug 15, 2026 · Updated Aug 15, 2026

Denial of service in Linux kernel 7.1 through 7.1.4 allows remote attackers to hang NTFS operations through an exported volume. In get_nr_free_clusters(), a failed file_ra_state allocation returns before NVolFreeClusterKnown is set and vol->free_waitq is awakened, leaving callers blocked indefinitely. Reachability requires memory pressure during NTFS free-space initialization and a read-write-mounted volume; remote access additionally requires an NFS or SMB export.

CVSS severity7.5
High
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux kernel 7.1 through 7.1.4 allows remote attackers to hang NTFS operations through an exported volume. In get_nr_free_clusters(), a failed file_ra_state allocation returns before NVolFreeClusterKnown is set and vol->free_waitq is awakened, leaving callers blocked indefinitely. Reachability requires memory pressure during NTFS free-space initialization and a read-write-mounted volume; remote access additionally requires an NFS or SMB export.

The record

CVE
CVE-2026-72202
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

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=0 <7.1.5
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <40ee64e633e5e413f2255bb48c063977d8c86f34
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c05132077df57a384919f61d7f8a8e76d748a6d4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0 <7.1.5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <40ee64e633e5e413f2255bb48c063977d8c86f34; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c05132077df57a384919f61d7f8a8e76d748a6d4

Published CVSS scores

7.5Linux kernel CNACVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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