CVE-2024-46733

Local service interruption via qgroup reservation leak

Published Sep 18, 2024 · Updated May 11, 2026

Resource leak in Btrfs in Linux kernel 5.9 and later allows local users to trigger unmount failures through failed buffered writes. In cow_file_range, error paths reached before ordered_extent creation clear delalloc but omit btrfs_free_qgroup_data, leaving the dirty page's reservation unreleased. Low-privileged local access and active Btrfs qgroup accounting are required; repeated failures consume reserved space and produce I/O errors and warnings during unmount.

CVSS severity5.5
Medium
EPSS probability0.17%
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 Btrfs in Linux kernel 5.9 and later allows local users to trigger unmount failures through failed buffered writes. In cow_file_range, error paths reached before ordered_extent creation clear delalloc but omit btrfs_free_qgroup_data, leaving the dirty page's reservation unreleased. Low-privileged local access and active Btrfs qgroup accounting are required; repeated failures consume reserved space and produce I/O errors and warnings during unmount.

The record

CVE
CVE-2024-46733
Published
Sep 18, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=5.9
  2. Affected versionversion=7dbeaad0af7d0a1a2a8e41d04e90964368ddfcc5 <159f0f61b283ea71e827dd0c18c5dce197de1fa2
  3. Affected versionversion=7dbeaad0af7d0a1a2a8e41d04e90964368ddfcc5 <30479f31d44d47ed00ae0c7453d9b253537005b2
  4. Affected versionversion=7dbeaad0af7d0a1a2a8e41d04e90964368ddfcc5 <84464db2ec2a55b9313d5f264da196a37ec80994
  5. Affected versionversion=7dbeaad0af7d0a1a2a8e41d04e90964368ddfcc5 <e42ef22bc10f0309c0c65d8d6ca8b4127a674b7f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.9; version=7dbeaad0af7d0a1a2a8e41d04e90964368ddfcc5 <159f0f61b283ea71e827dd0c18c5dce197de1fa2; version=7dbeaad0af7d0a1a2a8e41d04e90964368ddfcc5 <30479f31d44d47ed00ae0c7453d9b253537005b2; version=7dbeaad0af7d0a1a2a8e41d04e90964368ddfcc5 <84464db2ec2a55b9313d5f264da196a37ec80994; version=7dbeaad0af7d0a1a2a8e41d04e90964368ddfcc5 <e42ef22bc10f0309c0c65d8d6ca8b4127a674b7f

Published CVSS scores

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
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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