CVE-2024-35956

Local resource exhaustion via qgroup reservation leak

Published May 20, 2024 · Updated May 23, 2026

Resource leak in the Btrfs qgroup subsystem in Linux allows local users to exhaust reservations through failed subvolume operations. Error cleanup converts PREALLOC reservations to PERTRANS before record_root_in_trans succeeds, leaving the transaction unable to release them. Exploitation requires enabled qgroups or simple quotas and repeated create, snapshot, or delete failures; debug builds report the leak at unmount.

CVSS severity5.5
Medium
EPSS probability0.23%
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 qgroup subsystem in Linux allows local users to exhaust reservations through failed subvolume operations. Error cleanup converts PREALLOC reservations to PERTRANS before record_root_in_trans succeeds, leaving the transaction unable to release them. Exploitation requires enabled qgroups or simple quotas and repeated create, snapshot, or delete failures; debug builds report the leak at unmount.

The record

CVE
CVE-2024-35956
Published
May 20, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 20, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=2978cb474745b2d93c263008d265e89985706094
  2. Affected versionversion=5.10
  3. Affected versionversion=5.9.5 <5.10
  4. Affected versionversion=e85fde5162bf1b242cbd6daf7dba0f9b457d592b <14431815a4ae4bcd7c7a68b6a64c66c7712d27c9
  5. Affected versionversion=e85fde5162bf1b242cbd6daf7dba0f9b457d592b <6c95336f5d8eb9ab79cd7306d71b6d0477363f8c
  6. Affected versionversion=e85fde5162bf1b242cbd6daf7dba0f9b457d592b <74e97958121aa1f5854da6effba70143f051b0cd
  7. Affected versionversion=e85fde5162bf1b242cbd6daf7dba0f9b457d592b <945559be6e282a812dc48f7bcd5adc60901ea4a0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2978cb474745b2d93c263008d265e89985706094; version=5.10; version=5.9.5 <5.10; version=e85fde5162bf1b242cbd6daf7dba0f9b457d592b <14431815a4ae4bcd7c7a68b6a64c66c7712d27c9; version=e85fde5162bf1b242cbd6daf7dba0f9b457d592b <6c95336f5d8eb9ab79cd7306d71b6d0477363f8c; version=e85fde5162bf1b242cbd6daf7dba0f9b457d592b <74e97958121aa1f5854da6effba70143f051b0cd; version=e85fde5162bf1b242cbd6daf7dba0f9b457d592b <945559be6e282a812dc48f7bcd5adc60901ea4a0

Published CVSS scores

5.5CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS: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-401Missing Release of Memory after Effective Lifetime

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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