CVE-2024-56758

System crash via unchecked Btrfs folio mapping

Published Jan 6, 2025 · Updated May 23, 2026

A race in Btrfs relocation in affected Linux kernel versions allows local users to crash the system during a transaction abort. After btrfs_read_folio() unlocks a folio, concurrent invalidation can clear its mapping before relocate_one_folio() relocks it; set_extent_mapping() then dereferences the unchecked null mapping. Triggering the crash requires local access and the narrow overlap of Btrfs relocation with transaction cleanup that invalidates the same folio.

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

A race in Btrfs relocation in affected Linux kernel versions allows local users to crash the system during a transaction abort. After btrfs_read_folio() unlocks a folio, concurrent invalidation can clear its mapping before relocate_one_folio() relocks it; set_extent_mapping() then dereferences the unchecked null mapping. Triggering the crash requires local access and the narrow overlap of Btrfs relocation with transaction cleanup that invalidates the same folio.

The record

CVE
CVE-2024-56758
Published
Jan 6, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 6, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=08daa38ca212d87f77beae839bc9be71079c7abf <36679fab54fa7bcffafd469e2c474c1fc4beaee0
  2. Affected versionversion=6.1.54 <6.1.141
  3. Affected versionversion=6.5.4 <6.6
  4. Affected versionversion=6.6
  5. Affected versionversion=9d1e020ed9649cf140fcfafd052cfdcce9e9d67d
  6. Affected versionversion=e7f1326cc24e22b38afc3acd328480a1183f9e79 <3e74859ee35edc33a022c3f3971df066ea0ca6b9
  7. Affected versionversion=e7f1326cc24e22b38afc3acd328480a1183f9e79 <c7b1bd52a031ad0144d42eef0ba8471ce75122dd
  8. Affected versionversion=e7f1326cc24e22b38afc3acd328480a1183f9e79 <d508e56270389b3a16f5b3cf247f4eb1bbad1578

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=08daa38ca212d87f77beae839bc9be71079c7abf <36679fab54fa7bcffafd469e2c474c1fc4beaee0; version=6.1.54 <6.1.141; version=6.5.4 <6.6; version=6.6; version=9d1e020ed9649cf140fcfafd052cfdcce9e9d67d; version=e7f1326cc24e22b38afc3acd328480a1183f9e79 <3e74859ee35edc33a022c3f3971df066ea0ca6b9; version=e7f1326cc24e22b38afc3acd328480a1183f9e79 <c7b1bd52a031ad0144d42eef0ba8471ce75122dd; version=e7f1326cc24e22b38afc3acd328480a1183f9e79 <d508e56270389b3a16f5b3cf247f4eb1bbad1578

Published CVSS scores

4.7SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
5.7SUSECVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.5NVDCVSS: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-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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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