CVE-2024-53176

Kernel crash via cached-dentry cleanup race

Published Dec 27, 2024 · Updated Aug 5, 2026

A race condition in the Linux kernel CIFS client allows local users to crash the kernel while unmounting an SMB share. The cifs_kill_sb() path calls close_all_cached_dirs() while cached-file cleanup can remove a cfid from the tracked list without dropping its dentry. A lease break, server reconnection, or cached-directory expiry can create the race; the resulting busy dentry triggers a kernel BUG and service interruption.

CVSS severity9.8
Critical
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in the Linux kernel CIFS client allows local users to crash the kernel while unmounting an SMB share. The cifs_kill_sb() path calls close_all_cached_dirs() while cached-file cleanup can remove a cfid from the tracked list without dropping its dentry. A lease break, server reconnection, or cached-directory expiry can create the race; the resulting busy dentry triggers a kernel BUG and service interruption.

The record

CVE
CVE-2024-53176
Published
Dec 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

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=6.1
  2. Affected versionversion=ebe98f1447bbccf8228335c62d86af02a0ed23f7 <3fa640d035e5ae526769615c35cb9ed4be6e3662
  3. Affected versionversion=ebe98f1447bbccf8228335c62d86af02a0ed23f7 <548812afd96982a76a93ba76c0582ea670c40d9e
  4. Affected versionversion=ebe98f1447bbccf8228335c62d86af02a0ed23f7 <73934e535cffbda1490fa97d82690a0f9aa73e94
  5. Affected versionversion=ebe98f1447bbccf8228335c62d86af02a0ed23f7 <ff4528bbc82d0d90073751f7b49e7b9e9c7e5638

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.1; version=ebe98f1447bbccf8228335c62d86af02a0ed23f7 <3fa640d035e5ae526769615c35cb9ed4be6e3662; version=ebe98f1447bbccf8228335c62d86af02a0ed23f7 <548812afd96982a76a93ba76c0582ea670c40d9e; version=ebe98f1447bbccf8228335c62d86af02a0ed23f7 <73934e535cffbda1490fa97d82690a0f9aa73e94; version=ebe98f1447bbccf8228335c62d86af02a0ed23f7 <ff4528bbc82d0d90073751f7b49e7b9e9c7e5638

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
9.8kernel.orgCVSS: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.

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

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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