CVE-2026-90071

Kernel crash via stale TEQL device pointer

Published Sep 17, 2026 · Updated Sep 18, 2026

Use-after-free in Linux kernel sch_teql allows local users with network-administration privileges to crash the kernel via TEQL traffic. teql_master_xmit() leaves skb->dev pointing to a failed slave, and teql_resolve() can queue that packet without holding a device reference. Exploitation requires privileged TEQL setup, a failed transmission, an unresolved neighbor, and deletion of the referenced slave before queued-packet processing dereferences freed memory.

CVSS severity4.1
Medium
EPSS probability0.16%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel sch_teql allows local users with network-administration privileges to crash the kernel via TEQL traffic. teql_master_xmit() leaves skb->dev pointing to a failed slave, and teql_resolve() can queue that packet without holding a device reference. Exploitation requires privileged TEQL setup, a failed transmission, an unresolved neighbor, and deletion of the referenced slave before queued-packet processing dereferences freed memory.

The record

CVE
CVE-2026-90071
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
admin

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

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=0bad9c86edd22dec4df83c2b29872d66fd8a2ff4 <96bc345a3f17543d0d92ada609e02198d6380e26
  2. Affected versionversion=0cc0c2e661af418bbf7074179ea5cfffc0a5c466 <0cd75037948567193f7f5767176538822ce23873
  3. Affected versionversion=0cc0c2e661af418bbf7074179ea5cfffc0a5c466 <dc4b95b8fee95113587e93ca116356032d271371
  4. Affected versionversion=21ea283c2750c8307aa35ee832b0951cc993c27d
  5. Affected versionversion=383493b9940e3d1b5517424081b3e072e20ec43c <1360bc93f5be1be3cf937ebea667b3418dd30a79
  6. Affected versionversion=5.10.253 <5.10.270
  7. Affected versionversion=5.15.203 <5.15.221
  8. Affected versionversion=57c153249143333bbf4ecf927bdf8aa2696ee397 <012559cf3c67ce8825a31d4f66b040b6fbaf775e
  9. Affected versionversion=59b06d8b9bdb6b64b3c534c18da68bce5ccd31be <aa39a790d56b40bfcf3861653ceb46a3a113adb6
  10. Affected versionversion=6.1.167 <6.1.188
  11. Affected versionversion=6.12.78 <6.12.110
  12. Affected versionversion=6.18.19 <6.18.52
  13. Affected versionversion=6.19.9 <6.20
  14. Affected versionversion=6.6.130 <6.6.157
  15. Affected versionversion=6b1f563d670162e188a0f2aec39c24b67b106e17 <d453bf439ef230b5743afc25e194adacca8c6e43
  16. Affected versionversion=7.0
  17. Affected versionversion=81a43e8005366f16e629d8c95dfe05beaa8d36a7 <00d8a387b23b7831ad9919256a6b9caaa10f19c3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=0bad9c86edd22dec4df83c2b29872d66fd8a2ff4 <96bc345a3f17543d0d92ada609e02198d6380e26; version=0cc0c2e661af418bbf7074179ea5cfffc0a5c466 <0cd75037948567193f7f5767176538822ce23873; version=0cc0c2e661af418bbf7074179ea5cfffc0a5c466 <dc4b95b8fee95113587e93ca116356032d271371; version=21ea283c2750c8307aa35ee832b0951cc993c27d; version=383493b9940e3d1b5517424081b3e072e20ec43c <1360bc93f5be1be3cf937ebea667b3418dd30a79; version=5.10.253 <5.10.270; version=5.15.203 <5.15.221; version=57c153249143333bbf4ecf927bdf8aa2696ee397 <012559cf3c67ce8825a31d4f66b040b6fbaf775e; version=59b06d8b9bdb6b64b3c534c18da68bce5ccd31be <aa39a790d56b40bfcf3861653ceb46a3a113adb6; version=6.1.167 <6.1.188; version=6.12.78 <6.12.110; version=6.18.19 <6.18.52; version=6.19.9 <6.20; version=6.6.130 <6.6.157; version=6b1f563d670162e188a0f2aec39c24b67b106e17 <d453bf439ef230b5743afc25e194adacca8c6e43; version=7.0; version=81a43e8005366f16e629d8c95dfe05beaa8d36a7 <00d8a387b23b7831ad9919256a6b9caaa10f19c3

Published CVSS scores

4.1Amazon LinuxCVSS:3.1/AV:L/AC:H/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

T1499.004Application 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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