CVE-2024-35870Network attack vector

Kernel crash via SMB session use-after-free

Published May 19, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux SMB client allows remote attackers to crash the kernel during SMB session reconnection. smb2_reconnect_server() dereferences ses->ipc after concurrent __cifs_put_smb_ses() frees the IPC and session during teardown because another thread can change ses_status away from SES_EXITING. Triggering the fault requires a connected client with no session or a concurrent status reset during teardown, and the demonstrated consequence is a general protection fault that interrupts the system.

CVSS severity9.8
Critical
EPSS probability0.62%
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 SMB client allows remote attackers to crash the kernel during SMB session reconnection. smb2_reconnect_server() dereferences ses->ipc after concurrent __cifs_put_smb_ses() frees the IPC and session during teardown because another thread can change ses_status away from SES_EXITING. Triggering the fault requires a connected client with no session or a concurrent status reset during teardown, and the demonstrated consequence is a general protection fault that interrupts the system.

The record

CVE
CVE-2024-35870
Published
May 19, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 19, 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

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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=b327a717e506980399464e304e363f94f95eb7a1 <24a9799aa8efecd0eb55a75e35f9d8e6400063aa
  3. Affected versionversion=b327a717e506980399464e304e363f94f95eb7a1 <45f2beda1f1bc3d962ec07db1ccc3197c25499a5
  4. Affected versionversion=b327a717e506980399464e304e363f94f95eb7a1 <6202996a1c1887e83d0b3b0fcd86d0e5e6910ea0
  5. Affected versionversion=b327a717e506980399464e304e363f94f95eb7a1 <755fe68cd4b59e1d2a2dd3286177fd4404f57fed

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.16; version=b327a717e506980399464e304e363f94f95eb7a1 <24a9799aa8efecd0eb55a75e35f9d8e6400063aa; version=b327a717e506980399464e304e363f94f95eb7a1 <45f2beda1f1bc3d962ec07db1ccc3197c25499a5; version=b327a717e506980399464e304e363f94f95eb7a1 <6202996a1c1887e83d0b3b0fcd86d0e5e6910ea0; version=b327a717e506980399464e304e363f94f95eb7a1 <755fe68cd4b59e1d2a2dd3286177fd4404f57fed

Published CVSS scores

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-416Use After Free
T1499.004Application or System Exploitation

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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