CVE-2026-72492Network attack vector

Authenticated kernel memory corruption via lease-reference race

Published Aug 15, 2026 · Updated Aug 15, 2026

Use-after-free in Linux kernel ksmbd allows remote authenticated users to crash or corrupt the SMB server through concurrent lease operations. same_client_has_lease() returns an oplock_info pointer after releasing ci->m_lock without retaining a reference, and smb_grant_oplock() later dereferences it after a concurrent close can free it. A valid SMB2 session, tree connection, share permission, and SMB3 leasing are required; exploitation can panic the host or corrupt kernel memory.

CVSS severity8.8
High
EPSS probability0.48%
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 Linux kernel ksmbd allows remote authenticated users to crash or corrupt the SMB server through concurrent lease operations. same_client_has_lease() returns an oplock_info pointer after releasing ci->m_lock without retaining a reference, and smb_grant_oplock() later dereferences it after a concurrent close can free it. A valid SMB2 session, tree connection, share permission, and SMB3 leasing are required; exploitation can panic the host or corrupt kernel memory.

The record

CVE
CVE-2026-72492
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
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 <09634cd055d9bd8dd167995ea52bcd8028dd5dac
  3. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <0ff82a9cf9312678d8bc4edeef0b6e82659ac12a
  4. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <35d3d6ff2bc1e7aaecb15d5377ebbd6227acae0d
  5. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <65b655f65c3ca1ab5d598d3832bb0ff531725858
  6. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <79c7c59bb519db6f5a2a151965e825ec725614cc
  7. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <7c3264d273d524aa6adcce23c01087271f13586f
  8. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <aaa3bb2bbf2ccbfea9e4e0b9dabf3afc60b50cd0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <09634cd055d9bd8dd167995ea52bcd8028dd5dac; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <0ff82a9cf9312678d8bc4edeef0b6e82659ac12a; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <35d3d6ff2bc1e7aaecb15d5377ebbd6227acae0d; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <65b655f65c3ca1ab5d598d3832bb0ff531725858; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <79c7c59bb519db6f5a2a151965e825ec725614cc; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <7c3264d273d524aa6adcce23c01087271f13586f; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <aaa3bb2bbf2ccbfea9e4e0b9dabf3afc60b50cd0

Published CVSS scores

8.8Linux Kernel CNACVSS:3.1/AV:N/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

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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

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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