CVE-2024-46786

Kernel crash via uncleared fscache timer

Published Sep 18, 2024 · Updated Sep 8, 2026

Use-after-free in the Linux kernel fscache component allows local users to crash an affected system during module removal. The fscache_cookie_lru_timer remains queued on a CPU timer list when the fscache module exits, so a later softIRQ dereferences freed module state. Triggering requires privileged module removal after timer_reduce(), though filesystem unmount or shutdown can also reach the crash.

CVSS severity6.7
Medium
EPSS probability0.22%
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 the Linux kernel fscache component allows local users to crash an affected system during module removal. The fscache_cookie_lru_timer remains queued on a CPU timer list when the fscache module exits, so a later softIRQ dereferences freed module state. Triggering requires privileged module removal after timer_reduce(), though filesystem unmount or shutdown can also reach the crash.

The record

CVE
CVE-2024-46786
Published
Sep 18, 2024
Updated
Sep 8, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-416, T1529
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 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=V3.1.6 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.6 <*
The Linux Kernel Organization · Linuxversion=12bb21a29c19aae50cfad4e2bb5c943108f34a7d <0a11262549ac2ac6fb98c7cd40a67136817e5a52; version=12bb21a29c19aae50cfad4e2bb5c943108f34a7d <72a6e22c604c95ddb3b10b5d3bb85b6ff4dbc34f; version=12bb21a29c19aae50cfad4e2bb5c943108f34a7d <c1fc36d5470335546c45799d94d7bb2cbc09e8b7; version=12bb21a29c19aae50cfad4e2bb5c943108f34a7d <e0d724932ad12e3528f4ce97fc0f6078d0cce4bc; version=5.17
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.6 <*
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.6 <*

Published CVSS scores

6.7Red HatCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
7.8Siemens ProductCERTCVSS: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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