CVE-2026-90393Hinoki check available

Invalid memory access via BPF link-update race

Published Sep 17, 2026 · Updated Sep 17, 2026

Use-after-free in Linux BPF allows local users to trigger invalid kernel memory access via concurrent network-namespace link updates. The bpf_netns_link_update_prog function checks link->prog before taking netns_bpf_mutex, allowing another thread to replace and free the program before its type is read. Reaching the race requires access to update the same BPF link from two threads; the upstream disclosure does not establish a reliable privilege-escalation outcome.

CVSS severity7.3
High
EPSS probability0.23%
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 BPF allows local users to trigger invalid kernel memory access via concurrent network-namespace link updates. The bpf_netns_link_update_prog function checks link->prog before taking netns_bpf_mutex, allowing another thread to replace and free the program before its type is read. Reaching the race requires access to update the same BPF link from two threads; the upstream disclosure does not establish a reliable privilege-escalation outcome.

The record

CVE
CVE-2026-90393
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.8
  2. Affected versionversion=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <277168cb9d153ce8e9c3f9275670e32ae61b41d6
  3. Affected versionversion=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <5c5997836381010fc5907b36bc17d3b19407e933
  4. Affected versionversion=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <79a66fd997d4eecf17302d613194879eb32e0986
  5. Affected versionversion=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7
  6. Affected versionversion=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <bda86e9f31b9a296b6e64a51c91dc776fc9f613e
  7. Affected versionversion=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <bdddf3e1493ee973619c154a57071ce67f78598b
  8. Affected versionversion=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <d462b5481d77ce7df8a5ff89a699386f00c9214d
  9. Affected versionversion=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <f4ce6803df4095777191d800bebc50219b615ca0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.8; version=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <277168cb9d153ce8e9c3f9275670e32ae61b41d6; version=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <5c5997836381010fc5907b36bc17d3b19407e933; version=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <79a66fd997d4eecf17302d613194879eb32e0986; version=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7; version=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <bda86e9f31b9a296b6e64a51c91dc776fc9f613e; version=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <bdddf3e1493ee973619c154a57071ce67f78598b; version=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <d462b5481d77ce7df8a5ff89a699386f00c9214d; version=7f045a49fee04b5662cbdeaf0838f9322ae8c63a <f4ce6803df4095777191d800bebc50219b615ca0

Published CVSS scores

6.9TenableAV:L/AC:M/Au:N/C:C/I:C/A:C
7.0SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
5.8Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
7.3SUSECVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.0TenableCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
6.4TenableCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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