CVE-2026-90104Network attack vectorHinoki check available

Kernel crash via uninitialized NFS callback pointer

Published Sep 17, 2026 · Updated Sep 18, 2026

Memory corruption in the Linux NFSv4.1 callback decoder allows attackers to crash a client via an empty referring-call list. decode_cb_sequence_args() leaves rcl_refcalls uninitialized when decode_rc_list() receives zero referring calls, and cleanup passes the stale slab value to kfree(). Reachability requires an affected kernel to process the crafted NFSv4.1 callback; the bounded consequences are kernel-memory corruption and a host crash.

CVSS severityUnavailable
Unscored
EPSS probability0.61%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Memory corruption in the Linux NFSv4.1 callback decoder allows attackers to crash a client via an empty referring-call list. decode_cb_sequence_args() leaves rcl_refcalls uninitialized when decode_rc_list() receives zero referring calls, and cleanup passes the stale slab value to kfree(). Reachability requires an affected kernel to process the crafted NFSv4.1 callback; the bounded consequences are kernel-memory corruption and a host crash.

The record

CVE
CVE-2026-90104
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
Unavailable

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

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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=2.6.31
  2. Affected versionversion=4aece6a19cf7f474f15eb861ba74db4479884ce3 <8fa4804fe62ca4155a2d8fc2789d630376cbf2fc
  3. Affected versionversion=4aece6a19cf7f474f15eb861ba74db4479884ce3 <f31f3c042e024aef437cda42f0424ae8d4594b6c

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.31; version=4aece6a19cf7f474f15eb861ba74db4479884ce3 <8fa4804fe62ca4155a2d8fc2789d630376cbf2fc; version=4aece6a19cf7f474f15eb861ba74db4479884ce3 <f31f3c042e024aef437cda42f0424ae8d4594b6c

Published CVSS scores

No CVSS assessment is available in this record.

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)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application 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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