CVE-2023-4389

Crash or kernel-memory disclosure via double free

Published Aug 16, 2023 · Updated Oct 15, 2024

Double free in the btrfs filesystem in the Linux Kernel allows local users to crash the system or disclose internal kernel information. When btrfs_insert_fs_root fails, btrfs_get_root_ref calls btrfs_put_root, potentially frees root, then reuses it in the non-EEXIST error path after goto fail. Low-privileged local access is required; the bounded consequence is a system crash or kernel-information disclosure.

CVSS severity7.1
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in the btrfs filesystem in the Linux Kernel allows local users to crash the system or disclose internal kernel information. When btrfs_insert_fs_root fails, btrfs_get_root_ref calls btrfs_put_root, potentially frees root, then reuses it in the non-EEXIST error path after goto fail. Low-privileged local access is required; the bounded consequence is a system crash or kernel-information disclosure.

The record

CVE
CVE-2023-4389
Published
Aug 16, 2023
Updated
Oct 15, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-415, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.0Red Hat, Inc.CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
5.8SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-415Double Free
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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