CVE-2024-46751

Kernel crash via zero-reference Btrfs extent

Published Sep 18, 2024 · Updated Aug 5, 2026

Denial of service in affected Linux kernels allows local users to crash the host by exercising a Btrfs extent with zero references. In fs/btrfs/extent-tree.c, btrfs_lookup_extent_info() passes a zero extent reference count to BUG_ON(), triggering a kernel panic instead of returning an error. Reaching the path requires local access to attach or loop-mount a crafted Btrfs image and drive it with file writes or subvolume deletion; the bounded consequence is a host outage.

CVSS severity7.8
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

Denial of service in affected Linux kernels allows local users to crash the host by exercising a Btrfs extent with zero references. In fs/btrfs/extent-tree.c, btrfs_lookup_extent_info() passes a zero extent reference count to BUG_ON(), triggering a kernel panic instead of returning an error. Reaching the path requires local access to attach or loop-mount a crafted Btrfs image and drive it with file writes or subvolume deletion; the bounded consequence is a host outage.

The record

CVE
CVE-2024-46751
Published
Sep 18, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=2.6.31
  2. Affected versionversion=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <18eb53a2734ff61b9a72c4fef5db7b38cb48ae16
  3. Affected versionversion=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <28cb13f29faf6290597b24b728dc3100c019356f
  4. Affected versionversion=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <3cfec712a439c5c5f5c718c5c669ee41a898f776
  5. Affected versionversion=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <9c309d2434abbe880712af7e60da9ead8b6703fe
  6. Affected versionversion=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <d64807ded1b6054f066e03d8add6d920f3db9e5d
  7. Affected versionversion=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <ef9a8b73c8b60b27d9db4787e624a3438ffe8428

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.31; version=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <18eb53a2734ff61b9a72c4fef5db7b38cb48ae16; version=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <28cb13f29faf6290597b24b728dc3100c019356f; version=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <3cfec712a439c5c5f5c718c5c669ee41a898f776; version=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <9c309d2434abbe880712af7e60da9ead8b6703fe; version=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <d64807ded1b6054f066e03d8add6d920f3db9e5d; version=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <ef9a8b73c8b60b27d9db4787e624a3438ffe8428

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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

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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