CVE-2025-71268Network attack vector

Remote write denial via leaked qgroup reservations

Published Mar 18, 2026 · Updated Mar 18, 2026

Resource leak in the Btrfs inline-extent path in Linux Kernel allows remote attackers to exhaust qgroup reservations and deny writes. __cow_file_range_inline() returns after a path-allocation or transaction-join failure without passing reserved qgroup data to btrfs_qgroup_free_data(). Reachability requires qgroups plus a guest-writable ksmbd share or anonymous NFS export; repeated inline writes and memory pressure can block further writes.

CVSS severity7.5
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in the Btrfs inline-extent path in Linux Kernel allows remote attackers to exhaust qgroup reservations and deny writes. __cow_file_range_inline() returns after a path-allocation or transaction-join failure without passing reserved qgroup data to btrfs_qgroup_free_data(). Reachability requires qgroups plus a guest-writable ksmbd share or anonymous NFS export; repeated inline writes and memory pressure can block further writes.

The record

CVE
CVE-2025-71268
Published
Mar 18, 2026
Updated
Mar 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 18, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <28768bd3abf9995a93f6e01bfce01c60622964dd
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <28b97fcbbf523779688e8de5fe55bf2dae3859f6
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c1c050f92d8f6aac4e17f7f2230160794fceef0c
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f3ee1732851aec6fe6b2cec2ef1b32d4e71d9913
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f7156512c8166d385f574b9ec030479aa7b1e8c9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <28768bd3abf9995a93f6e01bfce01c60622964dd; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <28b97fcbbf523779688e8de5fe55bf2dae3859f6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c1c050f92d8f6aac4e17f7f2230160794fceef0c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f3ee1732851aec6fe6b2cec2ef1b32d4e71d9913; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f7156512c8166d385f574b9ec030479aa7b1e8c9

Published CVSS scores

3.3OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5kernel.orgCVSS: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

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
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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