CVE-2024-56744

System hang via reversed F2FS lock order

Published Dec 29, 2024 · Updated May 23, 2026

Improper locking in the Linux kernel F2FS implementation allows local users to hang the system through filesystem activity. The f2fs_record_stop_reason() path takes sbi->sb_lock while inode eviction holds sb_internal, but committing the superblock can enter filesystem reclaim and recreate the opposite lock order. Exploitation requires local low-privileged access and a mounted F2FS filesystem; the resulting circular dependency can deadlock kernel work and interrupt service.

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

What happened

Improper locking in the Linux kernel F2FS implementation allows local users to hang the system through filesystem activity. The f2fs_record_stop_reason() path takes sbi->sb_lock while inode eviction holds sb_internal, but committing the superblock can enter filesystem reclaim and recreate the opposite lock order. Exploitation requires local low-privileged access and a mounted F2FS filesystem; the resulting circular dependency can deadlock kernel work and interrupt service.

The record

CVE
CVE-2024-56744
Published
Dec 29, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 29, 2024CVE 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=6.4.4 <6.5
  2. Affected versionversion=6.5
  3. Affected versionversion=b62e71be2110d8b52bf5faf3c3ed7ca1a0c113a5 <1539a088b108996bcdaddb7775070b5163b14233
  4. Affected versionversion=b62e71be2110d8b52bf5faf3c3ed7ca1a0c113a5 <801092a2c9c251ef6a8678fcb8fcc1220474a697
  5. Affected versionversion=b62e71be2110d8b52bf5faf3c3ed7ca1a0c113a5 <ecf4e6782b01fd578b565b3dd2be7bb0ac91082e
  6. Affected versionversion=b62e71be2110d8b52bf5faf3c3ed7ca1a0c113a5 <f10a890308a7cd8794e21f646f09827c6cb4bf5d
  7. Affected versionversion=ed1d478bf838820201f3fb67a1748fdf15954ea4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.4.4 <6.5; version=6.5; version=b62e71be2110d8b52bf5faf3c3ed7ca1a0c113a5 <1539a088b108996bcdaddb7775070b5163b14233; version=b62e71be2110d8b52bf5faf3c3ed7ca1a0c113a5 <801092a2c9c251ef6a8678fcb8fcc1220474a697; version=b62e71be2110d8b52bf5faf3c3ed7ca1a0c113a5 <ecf4e6782b01fd578b565b3dd2be7bb0ac91082e; version=b62e71be2110d8b52bf5faf3c3ed7ca1a0c113a5 <f10a890308a7cd8794e21f646f09827c6cb4bf5d; version=ed1d478bf838820201f3fb67a1748fdf15954ea4

Published CVSS scores

5.5OracleCVSS: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.

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-667Improper Locking
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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