CVE-2024-23850

Local system crash via Btrfs subvolume race

Published Jan 23, 2024 · Updated Nov 4, 2025

Reachable assertion in the Linux kernel through 6.7.1 allows local users to crash the system during Btrfs subvolume creation. In btrfs_get_root_ref, a back-reference walk can cache the new root and assign an anonymous device before btrfs_get_new_fs_root uses its preallocated device, violating the !anon_dev assertion. A low-privileged user must create a Btrfs subvolume and win this race; the documented consequence is a kernel crash, not data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in the Linux kernel through 6.7.1 allows local users to crash the system during Btrfs subvolume creation. In btrfs_get_root_ref, a back-reference walk can cache the new root and assign an anonymous device before btrfs_get_new_fs_root uses its preallocated device, violating the !anon_dev assertion. A low-privileged user must create a Btrfs subvolume and win this race; the documented consequence is a kernel crash, not data disclosure or modification.

The record

CVE
CVE-2024-23850
Published
Jan 23, 2024
Updated
Nov 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 23, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 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?

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

5.5NISTCVSS: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-617Reachable Assertion
T1499.004Endpoint Denial of Service: Application 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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