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Back to active CVEs
Critical · CVSS 9.8CVE-2026-90104

NFSv4.1: zero referring call lists before decodingCVE-2026-90104

Answer in brief

CVE-2026-90104 records a Critical severity (CVSS 9.8) vulnerability in NFSv4.1: zero referring call lists before decoding. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Oct 30, 2026Source checked Nov 1, 2026First seen by HOL Sep 17, 2026Material review Oct 30, 2026
Upstream Advisory

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Nov 1, 2026
References
6 linked sources
Open source record

Key facts

Risk
Critical · CVSS 9.8
Exploitation
Not marked as known exploited
Affected software
5 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=4aece6a19cf7f474f15eb861ba74db4479884ce3 <f31f3c042e024aef437cda42f0424ae8d4594b6c || >=4aece6a19cf7f474f15eb861ba74db4479884ce3 <8fa4804fe62ca4155a2d8fc2789d630376cbf2fcf31f3c042e024aef437cda42f0424ae8d4594b6c, 8fa4804fe62ca4155a2d8fc2789d630376cbf2fc
Linux/Linuxgeneric2.6.31Not reported
Linux/Linuxgeneric>=4aece6a19cf7f474f15eb861ba74db4479884ce3 <f4d23937e1c41995c2f54af26c89b5e48a41c299 || >=4aece6a19cf7f474f15eb861ba74db4479884ce3 <f31f3c042e024aef437cda42f0424ae8d4594b6c || >=4aece6a19cf7f474f15eb861ba74db4479884ce3 <8fa4804fe62ca4155a2d8fc2789d630376cbf2fcf4d23937e1c41995c2f54af26c89b5e48a41c299, f31f3c042e024aef437cda42f0424ae8d4594b6c, 8fa4804fe62ca4155a2d8fc2789d630376cbf2fc
Linux/Linuxgeneric>=4aece6a19cf7f474f15eb861ba74db4479884ce3 <ed54460caf5b5aa65ec03c9a6032d831f39f19f5 || >=4aece6a19cf7f474f15eb861ba74db4479884ce3 <7510a5b9edec9d9536a4e69f10edfb2592e6cf7f || >=4aece6a19cf7f474f15eb861ba74db4479884ce3 <f4d23937e1c41995c2f54af26c89b5e48a41c299 || >=4aece6a19cf7f474f15eb861ba74db4479884ce3 <f31f3c042e024aef437cda42f0424ae8d4594b6c || >=4aece6a19cf7f474f15eb861ba74db4479884ce3 <8fa4804fe62ca4155a2d8fc2789d630376cbf2fced54460caf5b5aa65ec03c9a6032d831f39f19f5, 7510a5b9edec9d9536a4e69f10edfb2592e6cf7f, f4d23937e1c41995c2f54af26c89b5e48a41c299, f31f3c042e024aef437cda42f0424ae8d4594b6c, 8fa4804fe62ca4155a2d8fc2789d630376cbf2fc
Linux/Linuxgeneric>=4aece6a19cf7f474f15eb861ba74db4479884ce3 <810f6b3a29ac96fdc16909132b31627dae6824c2 || >=4aece6a19cf7f474f15eb861ba74db4479884ce3 <ed54460caf5b5aa65ec03c9a6032d831f39f19f5 || >=4aece6a19cf7f474f15eb861ba74db4479884ce3 <7510a5b9edec9d9536a4e69f10edfb2592e6cf7f || >=4aece6a19cf7f474f15eb861ba74db4479884ce3 <f4d23937e1c41995c2f54af26c89b5e48a41c299 || >=4aece6a19cf7f474f15eb861ba74db4479884ce3 <f31f3c042e024aef437cda42f0424ae8d4594b6c || >=4aece6a19cf7f474f15eb861ba74db4479884ce3 <8fa4804fe62ca4155a2d8fc2789d630376cbf2fc810f6b3a29ac96fdc16909132b31627dae6824c2, ed54460caf5b5aa65ec03c9a6032d831f39f19f5, 7510a5b9edec9d9536a4e69f10edfb2592e6cf7f, f4d23937e1c41995c2f54af26c89b5e48a41c299, f31f3c042e024aef437cda42f0424ae8d4594b6c, 8fa4804fe62ca4155a2d8fc2789d630376cbf2fc

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to f31f3c042e024aef437cda42f0424ae8d4594b6c; Linux/Linux to f4d23937e1c41995c2f54af26c89b5e48a41c299; Linux/Linux to ed54460caf5b5aa65ec03c9a6032d831f39f19f5; Linux/Linux to 810f6b3a29ac96fdc16909132b31627dae6824c2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 17, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 30, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 17, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: NFSv4.1: zero referring call lists before decoding decode_cb_sequence_args() allocates csa_rclists with kmalloc_objs(), so each referring_call_list starts uninitialized. decode_rc_list() assigns rcl_refcalls only when rcl_nrefcalls is nonzero. A valid list with zero referring calls therefore leaves the pointer uninitialized, and nfs4_callback_sequence() later passes stale slab contents to kfree(). Allocate csa_rclists with kzalloc_objs() so every rcl_refcalls member is NULL from the beginning, including valid empty referring call lists.

Quoted source text, attributed separately from HOL analysis.