CVE-2024-46752

Kernel crash via invalid Btrfs relocation backref

Published Sep 18, 2024 · Updated May 11, 2026

Kernel panic in Btrfs in Linux 2.6.31 through 6.10.9 allows local users to crash the system through an inconsistent relocation-tree backref. The update_ref_for_cow function calls BUG_ON when a relocation-tree extent buffer lacks the full-backref flag, converting an unexpected metadata invariant into a fatal kernel assertion. Reachability requires local low-privilege access and the specific Btrfs relocation state; the documented consequence is availability loss only.

CVSS severity5.5
Medium
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

Kernel panic in Btrfs in Linux 2.6.31 through 6.10.9 allows local users to crash the system through an inconsistent relocation-tree backref. The update_ref_for_cow function calls BUG_ON when a relocation-tree extent buffer lacks the full-backref flag, converting an unexpected metadata invariant into a fatal kernel assertion. Reachability requires local low-privilege access and the specific Btrfs relocation state; the documented consequence is availability loss only.

The record

CVE
CVE-2024-46752
Published
Sep 18, 2024
Updated
May 11, 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. 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=2.6.31
  2. Affected versionversion=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <0fbac73a97286a7ec72229cb9b42d760a2c717ac
  3. Affected versionversion=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <41a0f85e268d72fe04f731b8ceea4748c2d65491
  4. Affected versionversion=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <b50857b96429a09fd3beed9f7f21b7bb7c433688
  5. Affected versionversion=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <b56329a782314fde5b61058e2a25097af7ccb675
  6. Affected versionversion=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <f895db00c65e5d77c437cce946da9ec29dcdf563

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.31; version=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <0fbac73a97286a7ec72229cb9b42d760a2c717ac; version=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <41a0f85e268d72fe04f731b8ceea4748c2d65491; version=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <b50857b96429a09fd3beed9f7f21b7bb7c433688; version=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <b56329a782314fde5b61058e2a25097af7ccb675; version=5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0 <f895db00c65e5d77c437cce946da9ec29dcdf563

Published CVSS scores

5.5CanonicalCVSS: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

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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