CVE-2026-72318Network attack vector

Memory disclosure or crash via unchecked DFS offsets

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds read in the Linux kernel CIFS client allows remote attackers to disclose kernel memory or crash systems via a malformed DFS referral. parse_dfs_referrals() derives DfsPath and NetworkAddress pointers from server-supplied offsets without confirming that they remain inside the response buffer, then passes a negative remaining length as an unsigned size to string duplication code. Exposure requires a CIFS client to process a crafted DFS referral from a malicious or compromised SMB server; the bounded outcomes are memory disclosure and a kernel crash.

CVSS severity8.2
High
EPSS probability0.59%
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 the Linux kernel CIFS client allows remote attackers to disclose kernel memory or crash systems via a malformed DFS referral. parse_dfs_referrals() derives DfsPath and NetworkAddress pointers from server-supplied offsets without confirming that they remain inside the response buffer, then passes a negative remaining length as an unsigned size to string duplication code. Exposure requires a CIFS client to process a crafted DFS referral from a malicious or compromised SMB server; the bounded outcomes are memory disclosure and a kernel crash.

The record

CVE
CVE-2026-72318
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE 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

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=4.11
  2. Affected versionversion=4ecce920e13ace16a5ba45efe8909946c28fb2ad <027a84ac6b50c12ef767c15abfc58aa865820e9e
  3. Affected versionversion=4ecce920e13ace16a5ba45efe8909946c28fb2ad <76c607b9353d377b1d1b11db50e743eee0ccf658
  4. Affected versionversion=4ecce920e13ace16a5ba45efe8909946c28fb2ad <929a85932d14190988f1eafd6ee8cc68d66ace0b
  5. Affected versionversion=4ecce920e13ace16a5ba45efe8909946c28fb2ad <b784cd1c24d89bf71be2efe1e948ff7c03371e57
  6. Affected versionversion=4ecce920e13ace16a5ba45efe8909946c28fb2ad <c37abc99bb3de3d3219ecef253d649f74117fd83
  7. Affected versionversion=4ecce920e13ace16a5ba45efe8909946c28fb2ad <d64b6be5740ce230aca184d8d224c75d9866045d

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.11; version=4ecce920e13ace16a5ba45efe8909946c28fb2ad <027a84ac6b50c12ef767c15abfc58aa865820e9e; version=4ecce920e13ace16a5ba45efe8909946c28fb2ad <76c607b9353d377b1d1b11db50e743eee0ccf658; version=4ecce920e13ace16a5ba45efe8909946c28fb2ad <929a85932d14190988f1eafd6ee8cc68d66ace0b; version=4ecce920e13ace16a5ba45efe8909946c28fb2ad <b784cd1c24d89bf71be2efe1e948ff7c03371e57; version=4ecce920e13ace16a5ba45efe8909946c28fb2ad <c37abc99bb3de3d3219ecef253d649f74117fd83; version=4ecce920e13ace16a5ba45efe8909946c28fb2ad <d64b6be5740ce230aca184d8d224c75d9866045d

Published CVSS scores

8.2Amazon LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
7.0Oracle LinuxCVSS:3.1/AV:L/AC:H/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.

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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-125Out-of-bounds Read
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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