CVE-2026-90171Hinoki check available

Kernel crash via premature child socket destruction

Published Sep 17, 2026 · Updated Sep 17, 2026

Use-after-free in Linux 7.1 SMB Direct allows local users to crash the kernel via privileged listener shutdown with pending sockets. In fs/smb/smbdirect/socket.c, smbdirect_socket_destroy() frees child connection IDs before destroying the listener, leaving _cma_cancel_listens() to access freed memory. Reachability requires an active RDMA listener with pending or ready children and administrative shutdown access; the reported nested-lock warning is not a real deadlock.

CVSS severity4.1
Medium
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free in Linux 7.1 SMB Direct allows local users to crash the kernel via privileged listener shutdown with pending sockets. In fs/smb/smbdirect/socket.c, smbdirect_socket_destroy() frees child connection IDs before destroying the listener, leaving _cma_cancel_listens() to access freed memory. Reachability requires an active RDMA listener with pending or ready children and administrative shutdown access; the reported nested-lock warning is not a real deadlock.

The record

CVE
CVE-2026-90171
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=7.1
  2. Affected versionversion=dc691b91ad1677def14582a279e56fd943b52f94 <8ea83ef0c40ec4463695e22bc9ae43e29bcfede7
  3. Affected versionversion=dc691b91ad1677def14582a279e56fd943b52f94 <db82fbe4bb68e68e4aef00ef5b79f92991d8ef8e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=7.1; version=dc691b91ad1677def14582a279e56fd943b52f94 <8ea83ef0c40ec4463695e22bc9ae43e29bcfede7; version=dc691b91ad1677def14582a279e56fd943b52f94 <db82fbe4bb68e68e4aef00ef5b79f92991d8ef8e

Published CVSS scores

4.1Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/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.

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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
Privilegesadmin
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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