CVE-2026-74345Network attack vector

Kernel memory corruption via SIW endpoint use-after-free

Published Aug 15, 2026 · Updated Aug 15, 2026

Use-after-free in the Linux SIW RDMA driver allows remote attackers to corrupt kernel memory through a malformed MPA connection request. siw_socket_disassoc can release the endpoint's final reference before its caller clears the socket pointer, leaving siw_cm_work_handler to access the freed endpoint. An unauthenticated TCP connection to an administrator-started SIW listener is sufficient, exposing the host to a kernel panic or code execution.

CVSS severity9.8
Critical
EPSS probability0.44%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux SIW RDMA driver allows remote attackers to corrupt kernel memory through a malformed MPA connection request. siw_socket_disassoc can release the endpoint's final reference before its caller clears the socket pointer, leaving siw_cm_work_handler to access the freed endpoint. An unauthenticated TCP connection to an administrator-started SIW listener is sufficient, exposing the host to a kernel panic or code execution.

The record

CVE
CVE-2026-74345
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1190
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

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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=5.3
  2. Affected versionversion=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <b28d513393f81e2de00f82970487a9d001557e4e
  3. Affected versionversion=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <b6cf763eee0a932792bef64ceaca568d324192fc
  4. Affected versionversion=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <ea4f6f6c53577fb3f05dbd78b15e586772d49831
  5. Affected versionversion=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <f6183983ce1ff254d629a333739082b39d7c5eb6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.3; version=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <b28d513393f81e2de00f82970487a9d001557e4e; version=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <b6cf763eee0a932792bef64ceaca568d324192fc; version=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <ea4f6f6c53577fb3f05dbd78b15e586772d49831; version=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <f6183983ce1ff254d629a333739082b39d7c5eb6

Published CVSS scores

9.8LinuxCVSS:3.1/AV:N/AC:L/PR:N/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 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

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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