CVE-2026-90085

Kernel oops via unchecked debugfs SQ-context dereference

Published Sep 17, 2026 · Updated Sep 17, 2026

NULL dereference in Linux's octeontx2-af debugfs interface allows local users to trigger a kernel oops by reading tm_tree. The rvu_dbg_nix_tm_tree_display() function accesses pfvf->sq_ctx without checking allocation when the selected NIX logical function has no transmit queues set up. Exploitation requires the affected driver and access to /sys/kernel/debug/octeontx2/nix/tm_tree, normally restricted to root; the documented consequence is a kernel oops, not code execution.

CVSS severity4.4
Medium
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL dereference in Linux's octeontx2-af debugfs interface allows local users to trigger a kernel oops by reading tm_tree. The rvu_dbg_nix_tm_tree_display() function accesses pfvf->sq_ctx without checking allocation when the selected NIX logical function has no transmit queues set up. Exploitation requires the affected driver and access to /sys/kernel/debug/octeontx2/nix/tm_tree, normally restricted to root; the documented consequence is a kernel oops, not code execution.

The record

CVE
CVE-2026-90085
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
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=6.11
  2. Affected versionversion=b907194a5d5bcd3b01d28d095f6a4d9fcd9c5354 <537e11a1700f64dc6754108f0e1333ad63d4f548
  3. Affected versionversion=b907194a5d5bcd3b01d28d095f6a4d9fcd9c5354 <ec65631bd5ec251cdf67a4919fac7a3149a6e235
  4. Affected versionversion=b907194a5d5bcd3b01d28d095f6a4d9fcd9c5354 <fb736d733b0a60377cf53010571c261886446fd5
  5. Affected versionversion=b907194a5d5bcd3b01d28d095f6a4d9fcd9c5354 <fdf7358e2688f12eff41290bc45030b7aff0845e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=6.11; version=b907194a5d5bcd3b01d28d095f6a4d9fcd9c5354 <537e11a1700f64dc6754108f0e1333ad63d4f548; version=b907194a5d5bcd3b01d28d095f6a4d9fcd9c5354 <ec65631bd5ec251cdf67a4919fac7a3149a6e235; version=b907194a5d5bcd3b01d28d095f6a4d9fcd9c5354 <fb736d733b0a60377cf53010571c261886446fd5; version=b907194a5d5bcd3b01d28d095f6a4d9fcd9c5354 <fdf7358e2688f12eff41290bc45030b7aff0845e

Published CVSS scores

4.4SUSECVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/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.

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
Privilegesadmin
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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