CVE-2024-35863Network attack vector

Kernel compromise via exiting SMB session traversal

Published May 19, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux SMB client allows remote attackers controlling an SMB peer to crash or compromise the kernel. is_valid_oplock_break() walks each session's tcon_list after that session enters SES_EXITING, allowing teardown to free objects still being traversed. Reachability requires an active SMB client connection to a hostile or impersonated server; exploitation can corrupt kernel memory, interrupt the host, or execute in kernel context.

CVSS severity9.8
Critical
EPSS probability0.66%
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 controlling an SMB peer to crash or compromise the kernel. is_valid_oplock_break() walks each session's tcon_list after that session enters SES_EXITING, allowing teardown to free objects still being traversed. Reachability requires an active SMB client connection to a hostile or impersonated server; exploitation can corrupt kernel memory, interrupt the host, or execute in kernel context.

The record

CVE
CVE-2024-35863
Published
May 19, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1203
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 <0a15ba88a32fa7a516aff7ffd27befed5334dff2
  4. Affected versionversion=7f48558e6489d032b1584b0cc9ac4bb11072c034 <16d58c6a7db5050b9638669084b63fc05f951825
  5. Affected versionversion=7f48558e6489d032b1584b0cc9ac4bb11072c034 <494c91e1e9413b407d12166a61b84200d4d54fac
  6. Affected versionversion=7f48558e6489d032b1584b0cc9ac4bb11072c034 <69ccf040acddf33a3a85ec0f6b45ef84b0f7ec29
  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 <0a15ba88a32fa7a516aff7ffd27befed5334dff2; version=7f48558e6489d032b1584b0cc9ac4bb11072c034 <16d58c6a7db5050b9638669084b63fc05f951825; version=7f48558e6489d032b1584b0cc9ac4bb11072c034 <494c91e1e9413b407d12166a61b84200d4d54fac; version=7f48558e6489d032b1584b0cc9ac4bb11072c034 <69ccf040acddf33a3a85ec0f6b45ef84b0f7ec29; version=a67172a013953664b1dad03c648200c70b90506c

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1203Exploitation for Client Execution

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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