CVE-2026-90102Network attack vector

Remote crash via cross-version pNFS cache aliasing

Published Sep 17, 2026 · Updated Sep 18, 2026

A NULL-pointer dereference in the Linux pNFS flexfiles client allows remote attackers to crash affected systems via a crafted server. nfs4_pnfs_ds_add() caches data-server clients only by address, so NFSv3 and NFSv4 device IDs can alias and select incompatible RPC operations. Exploitation requires two device IDs for one data-server address with different NFS major versions; mismatched sequence-slot handling then interrupts the client system.

CVSS severity5.9
Medium
EPSS probability0.70%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A NULL-pointer dereference in the Linux pNFS flexfiles client allows remote attackers to crash affected systems via a crafted server. nfs4_pnfs_ds_add() caches data-server clients only by address, so NFSv3 and NFSv4 device IDs can alias and select incompatible RPC operations. Exploitation requires two device IDs for one data-server address with different NFS major versions; mismatched sequence-slot handling then interrupts the client system.

The record

CVE
CVE-2026-90102
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

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=4.0
  2. Affected versionversion=d67ae825a59d639e4d8b82413af84d854617a87e <02e160922bc83cd25e346a028ed43cbdb0b57e1a
  3. Affected versionversion=d67ae825a59d639e4d8b82413af84d854617a87e <13c23c5cb977f66390795437fd3837887ce1fd75
  4. Affected versionversion=d67ae825a59d639e4d8b82413af84d854617a87e <27f640cd92eebf5c2f64336be7ca24f4636390cb
  5. Affected versionversion=d67ae825a59d639e4d8b82413af84d854617a87e <bbc975cfb07a146843fde1126c43441e76177539
  6. Affected versionversion=d67ae825a59d639e4d8b82413af84d854617a87e <bc7aa9d8aff826031ffe25eba7f2f3acafcbf7a1
  7. Affected versionversion=d67ae825a59d639e4d8b82413af84d854617a87e <dd5bd091daa48c6ed8f9235ddf448aa288a0881f
  8. Affected versionversion=d67ae825a59d639e4d8b82413af84d854617a87e <f2994ba1263d9e88d3d9ae1d097c5cf811d4bfa5
  9. Affected versionversion=d67ae825a59d639e4d8b82413af84d854617a87e <ffb100b0da0e217d5d63ce6fe092f9c29e59f7dd

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.0; version=d67ae825a59d639e4d8b82413af84d854617a87e <02e160922bc83cd25e346a028ed43cbdb0b57e1a; version=d67ae825a59d639e4d8b82413af84d854617a87e <13c23c5cb977f66390795437fd3837887ce1fd75; version=d67ae825a59d639e4d8b82413af84d854617a87e <27f640cd92eebf5c2f64336be7ca24f4636390cb; version=d67ae825a59d639e4d8b82413af84d854617a87e <bbc975cfb07a146843fde1126c43441e76177539; version=d67ae825a59d639e4d8b82413af84d854617a87e <bc7aa9d8aff826031ffe25eba7f2f3acafcbf7a1; version=d67ae825a59d639e4d8b82413af84d854617a87e <dd5bd091daa48c6ed8f9235ddf448aa288a0881f; version=d67ae825a59d639e4d8b82413af84d854617a87e <f2994ba1263d9e88d3d9ae1d097c5cf811d4bfa5; version=d67ae825a59d639e4d8b82413af84d854617a87e <ffb100b0da0e217d5d63ce6fe092f9c29e59f7dd

Published CVSS scores

5.9Amazon LinuxCVSS:3.1/AV:N/AC:H/PR:N/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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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