CVE-2024-47691

Host crash via F2FS shutdown race

Published Oct 21, 2024 · Updated May 11, 2026

Use-after-free in Linux kernel F2FS allows local users with CAP_SYS_ADMIN to crash the host through concurrent remount and shutdown operations. f2fs_stop_gc_thread frees sbi->gc_thread during remount while f2fs_ioc_shutdown can concurrently pass its stale task pointer to kthread_stop. The race requires an F2FS mount and CAP_SYS_ADMIN; the resulting kernel memory-safety failure can interrupt the host.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel F2FS allows local users with CAP_SYS_ADMIN to crash the host through concurrent remount and shutdown operations. f2fs_stop_gc_thread frees sbi->gc_thread during remount while f2fs_ioc_shutdown can concurrently pass its stale task pointer to kthread_stop. The race requires an F2FS mount and CAP_SYS_ADMIN; the resulting kernel memory-safety failure can interrupt the host.

The record

CVE
CVE-2024-47691
Published
Oct 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1529
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Oct 21, 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=4.16
  2. Affected versionversion=7950e9ac638e84518fbdd5c930939ad46a1068c5 <7c339dee7eb0f8e4cadc317c595f898ef04dae30
  3. Affected versionversion=7950e9ac638e84518fbdd5c930939ad46a1068c5 <c7f114d864ac91515bb07ac271e9824a20f5ed95
  4. Affected versionversion=7950e9ac638e84518fbdd5c930939ad46a1068c5 <d79343cd66343709e409d96b2abb139a0a55ce34
  5. Affected versionversion=7950e9ac638e84518fbdd5c930939ad46a1068c5 <fc18e655b62ac6bc9f12f5de0d749b4a3fe1e812

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=4.16; version=7950e9ac638e84518fbdd5c930939ad46a1068c5 <7c339dee7eb0f8e4cadc317c595f898ef04dae30; version=7950e9ac638e84518fbdd5c930939ad46a1068c5 <c7f114d864ac91515bb07ac271e9824a20f5ed95; version=7950e9ac638e84518fbdd5c930939ad46a1068c5 <d79343cd66343709e409d96b2abb139a0a55ce34; version=7950e9ac638e84518fbdd5c930939ad46a1068c5 <fc18e655b62ac6bc9f12f5de0d749b4a3fe1e812

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1529System Shutdown/Reboot

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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