CVE-2024-53186Network attack vector

Kernel memory corruption via ksmbd teardown race

Published Dec 27, 2024 · Updated Aug 5, 2026

A use-after-free in Linux ksmbd allows remote attackers to corrupt kernel memory through unauthenticated SMB requests. The handle_ksmbd_work function decrements the request count, then accesses the connection wait queue after concurrent teardown has freed the connection object. Exposure requires the ksmbd server to be listening on TCP port 445; exploitation enables kernel memory reads or writes, while failed attempts can panic the host.

CVSS severity9.8
Critical
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A use-after-free in Linux ksmbd allows remote attackers to corrupt kernel memory through unauthenticated SMB requests. The handle_ksmbd_work function decrements the request count, then accesses the connection wait queue after concurrent teardown has freed the connection object. Exposure requires the ksmbd server to be listening on TCP port 445; exploitation enables kernel memory reads or writes, while failed attempts can panic the host.

The record

CVE
CVE-2024-53186
Published
Dec 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=18f06bacc197d4ac9b518ad1c69999bc3d83e7aa <a96f9eb7add30ba0fafcfe7b7aca090978196800
  2. Affected versionversion=6.10.14 <6.11
  3. Affected versionversion=6.11.3 <6.11.11
  4. Affected versionversion=6.12
  5. Affected versionversion=6.6.55 <6.6.64
  6. Affected versionversion=9fd3cde4628bcd3549ab95061f2bab74d2ed4f3b
  7. Affected versionversion=e9dac92f4482a382e8c0fe1bc243da5fc3526b0c <f20b77f7897e6aab9ce5527e6016ad2be5d70a33
  8. Affected versionversion=ee426bfb9d09b29987369b897fe9b6485ac2be27 <96261adb998a3b513468b6ce17dbec76be5507d4
  9. Affected versionversion=ee426bfb9d09b29987369b897fe9b6485ac2be27 <9a8c5d89d327ff58e9b2517f8a6afb4181d32c6e

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=18f06bacc197d4ac9b518ad1c69999bc3d83e7aa <a96f9eb7add30ba0fafcfe7b7aca090978196800; version=6.10.14 <6.11; version=6.11.3 <6.11.11; version=6.12; version=6.6.55 <6.6.64; version=9fd3cde4628bcd3549ab95061f2bab74d2ed4f3b; version=e9dac92f4482a382e8c0fe1bc243da5fc3526b0c <f20b77f7897e6aab9ce5527e6016ad2be5d70a33; version=ee426bfb9d09b29987369b897fe9b6485ac2be27 <96261adb998a3b513468b6ce17dbec76be5507d4; version=ee426bfb9d09b29987369b897fe9b6485ac2be27 <9a8c5d89d327ff58e9b2517f8a6afb4181d32c6e

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0CanonicalCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
9.8Linux kernel CNACVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1190Exploit Public-Facing Application

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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