CVE-2026-93285Hinoki check available

Kernel crash via F2FS GC thread use-after-free

Published Sep 24, 2026 · Updated Sep 24, 2026

Use-after-free in Linux F2FS GC-thread teardown allows local users to crash the kernel by racing remount or shutdown operations. The __sbi_store path reads sbi->gc_thread while f2fs_stop_gc_thread frees or clears the same dynamically allocated object, leaving its f2fs_gc_task dereference invalid. Triggering the race requires a mounted F2FS filesystem and privileged filesystem-control access; the bounded consequence is a kernel crash.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free in Linux F2FS GC-thread teardown allows local users to crash the kernel by racing remount or shutdown operations. The __sbi_store path reads sbi->gc_thread while f2fs_stop_gc_thread frees or clears the same dynamically allocated object, leaving its f2fs_gc_task dereference invalid. Triggering the race requires a mounted F2FS filesystem and privileged filesystem-control access; the bounded consequence is a kernel crash.

The record

CVE
CVE-2026-93285
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 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 <23eee01c732ec8c62b05416a05f0f88129df2960
  3. Affected versionversion=7950e9ac638e84518fbdd5c930939ad46a1068c5 <3d7bca9d583793bb7d0bac0d95a24ddd2e129eed
  4. Affected versionversion=7950e9ac638e84518fbdd5c930939ad46a1068c5 <99d14d61aa8beb6cb9a984b9fcddd45e35b24494

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=4.16; version=7950e9ac638e84518fbdd5c930939ad46a1068c5 <23eee01c732ec8c62b05416a05f0f88129df2960; version=7950e9ac638e84518fbdd5c930939ad46a1068c5 <3d7bca9d583793bb7d0bac0d95a24ddd2e129eed; version=7950e9ac638e84518fbdd5c930939ad46a1068c5 <99d14d61aa8beb6cb9a984b9fcddd45e35b24494

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
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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