CVE-2026-74522Network attack vector

Authenticated host crash via stale file-table pointer

Published Aug 15, 2026 · Updated Aug 15, 2026

Use-after-free in Linux ksmbd allows remote authenticated users to crash the host through concurrent SMB file handling. ksmbd_close_fd() drops the idr-owned reference but leaves the ksmbd_file pointer published in its owner session table, so a foreign final put frees the object without removing that entry. A second session must hold the temporary reference through final release; later owner-session teardown dereferences the stale pointer and can crash the system.

CVSS severity8.8
High
EPSS probability0.43%
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 ksmbd allows remote authenticated users to crash the host through concurrent SMB file handling. ksmbd_close_fd() drops the idr-owned reference but leaves the ksmbd_file pointer published in its owner session table, so a foreign final put frees the object without removing that entry. A second session must hold the temporary reference through final release; later owner-session teardown dereferences the stale pointer and can crash the system.

The record

CVE
CVE-2026-74522
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-825, T1499
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

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=5.15.38 <5.16
  2. Affected versionversion=5.17.6 <5.18
  3. Affected versionversion=5.18
  4. Affected versionversion=8510a043d334ecdf83d4604782f288db6bf21d60 <0c3918c2cee62ec6c9de8d5c73ebfe6f833961ac
  5. Affected versionversion=8510a043d334ecdf83d4604782f288db6bf21d60 <67aaec2a1fdce3e1dde46c45b5d1ef8cf22f65cd
  6. Affected versionversion=8510a043d334ecdf83d4604782f288db6bf21d60 <9be4a66f019ea90bd9deca70511f4f9ffebf5c6f
  7. Affected versionversion=8510a043d334ecdf83d4604782f288db6bf21d60 <cffbdc86393b0235383a20c8c59bc32f16036459
  8. Affected versionversion=8510a043d334ecdf83d4604782f288db6bf21d60 <e7188199eff46a636f3436356f0aae039be6dd66
  9. Affected versionversion=aaf1d5ebb358f546414965b39da90107a7ca7ce5
  10. Affected versionversion=df30cbfd3d8a70e61ce59f63ce5ed2261799ac10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15.38 <5.16; version=5.17.6 <5.18; version=5.18; version=8510a043d334ecdf83d4604782f288db6bf21d60 <0c3918c2cee62ec6c9de8d5c73ebfe6f833961ac; version=8510a043d334ecdf83d4604782f288db6bf21d60 <67aaec2a1fdce3e1dde46c45b5d1ef8cf22f65cd; version=8510a043d334ecdf83d4604782f288db6bf21d60 <9be4a66f019ea90bd9deca70511f4f9ffebf5c6f; version=8510a043d334ecdf83d4604782f288db6bf21d60 <cffbdc86393b0235383a20c8c59bc32f16036459; version=8510a043d334ecdf83d4604782f288db6bf21d60 <e7188199eff46a636f3436356f0aae039be6dd66; version=aaf1d5ebb358f546414965b39da90107a7ca7ce5; version=df30cbfd3d8a70e61ce59f63ce5ed2261799ac10

Published CVSS scores

8.8LinuxCVSS: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

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-825Expired Pointer Dereference
T1499Endpoint Denial of Service

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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