CVE-2025-40101

Service degradation via leaked btrfs allocations

Published Oct 30, 2025 · Updated Oct 30, 2025

Memory leaks in the btrfs zoned block-group loader in affected Linux kernels allow local users to degrade system availability. When btrfs_load_block_group_zone_info() rejects a non-SINGLE data profile without a RAID stripe tree, it returns before freeing allocations. Repeatedly reaching this local error path consumes kernel memory; no data disclosure or modification is reported.

CVSS severity4.8
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leaks in the btrfs zoned block-group loader in affected Linux kernels allow local users to degrade system availability. When btrfs_load_block_group_zone_info() rejects a non-SINGLE data profile without a RAID stripe tree, it returns before freeing allocations. Repeatedly reaching this local error path consumes kernel memory; no data disclosure or modification is reported.

The record

CVE
CVE-2025-40101
Published
Oct 30, 2025
Updated
Oct 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 30, 2025Record 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=5906333cc4af7b3fdb8cfff1cb3e8e579bd13174 <187333e6d484c6630286bfdd07c79d6815a63887
  2. Affected versionversion=5906333cc4af7b3fdb8cfff1cb3e8e579bd13174 <602701d00439e113331ee9c1283e95afdcb8849d
  3. Affected versionversion=5906333cc4af7b3fdb8cfff1cb3e8e579bd13174 <fec9b9d3ced39f16be8d7afdf81f4dd2653da319
  4. Affected versionversion=6.8
  5. Affected versionversion=6ffeca99bf6e84800133d21afd41c79d2f002db7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5906333cc4af7b3fdb8cfff1cb3e8e579bd13174 <187333e6d484c6630286bfdd07c79d6815a63887; version=5906333cc4af7b3fdb8cfff1cb3e8e579bd13174 <602701d00439e113331ee9c1283e95afdcb8849d; version=5906333cc4af7b3fdb8cfff1cb3e8e579bd13174 <fec9b9d3ced39f16be8d7afdf81f4dd2653da319; version=6.8; version=6ffeca99bf6e84800133d21afd41c79d2f002db7

Published CVSS scores

3.3SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
4.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

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

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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