CVE-2026-90292

Local kernel compromise via siw_accept use-after-free

Published Sep 17, 2026 · Updated Sep 18, 2026

Use-after-free in the Linux kernel's Soft-iWARP accept path allows local users to corrupt kernel memory through an RDMA accept request. When a userspace-supplied queue pair is already in RTS, siw_accept() enters cleanup before linking the incoming endpoint, then drops the wrong reference and writes through the freed endpoint. An unprivileged local user with access to the RDMA character devices can cause kernel-memory disclosure or corruption, control-flow hijacking, or a kernel panic.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel's Soft-iWARP accept path allows local users to corrupt kernel memory through an RDMA accept request. When a userspace-supplied queue pair is already in RTS, siw_accept() enters cleanup before linking the incoming endpoint, then drops the wrong reference and writes through the freed endpoint. An unprivileged local user with access to the RDMA character devices can cause kernel-memory disclosure or corruption, control-flow hijacking, or a kernel panic.

The record

CVE
CVE-2026-90292
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=5.3
  2. Affected versionversion=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <561651d6a15588cee2040755f253faca2463415c
  3. Affected versionversion=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <59de5502f32895ffe9c45530327ed997b90fdf06
  4. Affected versionversion=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <8f286a8094ee32c415f9ecd2c20765beb8a18c79
  5. Affected versionversion=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <a89d120615e711ce8fce551fd291c2f387666735
  6. Affected versionversion=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <a9394971825933074032794a5feee5211509c774
  7. Affected versionversion=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <b9e7d3d9fdb2bfcfb25d93529fdf766536b37c78
  8. Affected versionversion=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <d57db36e74cca4763e1c2c0c6eb9f84d19813879
  9. Affected versionversion=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <de603f01d9ccf823e575b013ffd86ebedca9a8c5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.3; version=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <561651d6a15588cee2040755f253faca2463415c; version=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <59de5502f32895ffe9c45530327ed997b90fdf06; version=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <8f286a8094ee32c415f9ecd2c20765beb8a18c79; version=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <a89d120615e711ce8fce551fd291c2f387666735; version=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <a9394971825933074032794a5feee5211509c774; version=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <b9e7d3d9fdb2bfcfb25d93529fdf766536b37c78; version=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <d57db36e74cca4763e1c2c0c6eb9f84d19813879; version=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <de603f01d9ccf823e575b013ffd86ebedca9a8c5

Published CVSS scores

7.8Linux CNACVSS:3.1/AV:L/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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

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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