CVE-2024-35864Network attack vector

System crash via torn-down SMB session access

Published May 19, 2024 · Updated Aug 5, 2026

Use-after-free in the SMB client of Linux 3.12.48 through 6.9-rc2 allows remote attackers to crash the system via a lease break. smb2_is_valid_lease_break() traverses sessions being torn down and dereferences session-owned state after its lifetime has ended. The path requires an SMB client connection whose session enters SES_EXITING while a lease-break message is processed, and the bounded reported outcome is a kernel crash.

CVSS severity9.8
Critical
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Use-after-free in the SMB client of Linux 3.12.48 through 6.9-rc2 allows remote attackers to crash the system via a lease break. smb2_is_valid_lease_break() traverses sessions being torn down and dereferences session-owned state after its lifetime has ended. The path requires an SMB client connection whose session enters SES_EXITING while a lease-break message is processed, and the bounded reported outcome is a kernel crash.

The record

CVE
CVE-2024-35864
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

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=3.12.48 <3.13
  2. Affected versionversion=3.13
  3. Affected versionversion=7f48558e6489d032b1584b0cc9ac4bb11072c034 <705c76fbf726c7a2f6ff9143d4013b18daaaebf1
  4. Affected versionversion=7f48558e6489d032b1584b0cc9ac4bb11072c034 <a8344e2b69bde63f713b0aa796d70dbeadffddfb
  5. Affected versionversion=7f48558e6489d032b1584b0cc9ac4bb11072c034 <c868cabdf6fdd61bea54532271f4708254e57fc5
  6. Affected versionversion=7f48558e6489d032b1584b0cc9ac4bb11072c034 <f92739fdd4522c4291277136399353d7c341fae4
  7. Affected versionversion=a67172a013953664b1dad03c648200c70b90506c

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.12.48 <3.13; version=3.13; version=7f48558e6489d032b1584b0cc9ac4bb11072c034 <705c76fbf726c7a2f6ff9143d4013b18daaaebf1; version=7f48558e6489d032b1584b0cc9ac4bb11072c034 <a8344e2b69bde63f713b0aa796d70dbeadffddfb; version=7f48558e6489d032b1584b0cc9ac4bb11072c034 <c868cabdf6fdd61bea54532271f4708254e57fc5; version=7f48558e6489d032b1584b0cc9ac4bb11072c034 <f92739fdd4522c4291277136399353d7c341fae4; version=a67172a013953664b1dad03c648200c70b90506c

Published CVSS scores

9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS: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.

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)
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo