CVE-2026-72382Network attack vector

Authenticated denial of service via DACL underflow

Published Aug 15, 2026 · Updated Aug 15, 2026

Denial of service in Linux kernel ksmbd allows remote authenticated users to exhaust memory via an undersized DACL in SMB2_SET_INFO. parse_dacl() subtracts the unsigned ACL-header size from a smaller attacker-controlled 16-bit DACL size, underflows to a large size_t, and accepts an excessive ACE count. The path requires valid SMB credentials and an active ksmbd server; the bounded impact is excessive temporary allocation and service interruption.

CVSS severity8.8
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

Denial of service in Linux kernel ksmbd allows remote authenticated users to exhaust memory via an undersized DACL in SMB2_SET_INFO. parse_dacl() subtracts the unsigned ACL-header size from a smaller attacker-controlled 16-bit DACL size, underflows to a large size_t, and accepts an excessive ACE count. The path requires valid SMB credentials and an active ksmbd server; the bounded impact is excessive temporary allocation and service interruption.

The record

CVE
CVE-2026-72382
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-131, T1499.004
Attack vector
network
Privileges
authenticated

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

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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 <15a9e9b8f7f5d7f380ae54c6f5bcbc0bdcb0f3cd
  3. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <16fb65ec15fe7c90f50a2115854bfd9a032d4023
  4. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <282847c0cf22f2e961155ac8e42f6eeab7e16049
  5. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <60908f7ebcd9b6cde74ad5711fab0f49c7970949
  6. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <d020e7f27bf65eecd3805404702f716b2b6d9e73

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <15a9e9b8f7f5d7f380ae54c6f5bcbc0bdcb0f3cd; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <16fb65ec15fe7c90f50a2115854bfd9a032d4023; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <282847c0cf22f2e961155ac8e42f6eeab7e16049; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <60908f7ebcd9b6cde74ad5711fab0f49c7970949; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <d020e7f27bf65eecd3805404702f716b2b6d9e73

Published CVSS scores

4.3Amazon LinuxCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
8.8CVE.orgCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Red HatCVSS: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-131Incorrect Calculation of Buffer Size
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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