CVE-2023-4130Network attack vector

Kernel memory disclosure and crash via EA parsing

Published Aug 16, 2025 · Updated Aug 15, 2026

Out-of-bounds read in Linux ksmbd allows remote authenticated users to disclose kernel memory or crash the host via crafted SMB EA data. smb2_set_ea() advances through FILE_FULL_EA_INFORMATION entries using attacker-controlled NextEntryOffset values, then validates the next entry against its start offset instead of the remaining buffer length. A writable SMB handle or share write access is required; the over-read can persist adjacent heap data in a retrievable extended attribute or trigger a kernel oops or panic.

CVSS severity8.1
High
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Linux ksmbd allows remote authenticated users to disclose kernel memory or crash the host via crafted SMB EA data. smb2_set_ea() advances through FILE_FULL_EA_INFORMATION entries using attacker-controlled NextEntryOffset values, then validates the next entry against its start offset instead of the remaining buffer length. A writable SMB handle or share write access is required; the over-read can persist adjacent heap data in a retrievable extended attribute or trigger a kernel oops or panic.

The record

CVE
CVE-2023-4130
Published
Aug 16, 2025
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=5.15
  2. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <4bf629262f9118ee91b1c3a518ebf2b3bcb22180
  3. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <79ed288cef201f1f212dfb934bcaac75572fb8f6
  4. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <aeb974907642be095e38ecb1a400ca583958b2b0
  5. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <f339d76a3a972601d0738b881b099d49ebbdc3a2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <4bf629262f9118ee91b1c3a518ebf2b3bcb22180; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <79ed288cef201f1f212dfb934bcaac75572fb8f6; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <aeb974907642be095e38ecb1a400ca583958b2b0; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <f339d76a3a972601d0738b881b099d49ebbdc3a2

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
8.1Linux kernel CVE teamCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1210Exploitation of Remote Services

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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