CVE-2026-90407Hinoki check available

Kernel disclosure and crash via unchecked firmware TLVs

Published Sep 17, 2026 · Updated Sep 18, 2026

Out-of-bounds reads in the Linux ath11k driver allow attackers controlling Wi-Fi firmware to disclose kernel memory or crash the host. ath11k_wmi_process_csa_switch_count_event() accepts an unchecked firmware num_vdevs value as the vdev_ids loop bound and lacks a minimum-length policy for the event TLV. Exploitation requires ath11k firmware able to send a malformed CSA switch-count event; the over-read cannot modify kernel memory.

CVSS severity7.7
High
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds reads in the Linux ath11k driver allow attackers controlling Wi-Fi firmware to disclose kernel memory or crash the host. ath11k_wmi_process_csa_switch_count_event() accepts an unchecked firmware num_vdevs value as the vdev_ids loop bound and lacks a minimum-length policy for the event TLV. Exploitation requires ath11k firmware able to send a malformed CSA switch-count event; the over-read cannot modify kernel memory.

The record

CVE
CVE-2026-90407
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
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=5.6
  2. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <0364926fb4bfb5b798e5fe2785b3023b4f767327
  3. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <208d7fdb85976a737a715b81d54efaff6703880c
  4. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <5de2b8c53714ad58f2fda118cd29ebbe31b38665
  5. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <d6625dc5f1fe42cd81b8c57a1f5317afb9b410ce
  6. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <f760b7d7e43584d2fa9bffcec1a04e502609f827

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.6; version=d5c65159f2895379e11ca13f62feabe93278985d <0364926fb4bfb5b798e5fe2785b3023b4f767327; version=d5c65159f2895379e11ca13f62feabe93278985d <208d7fdb85976a737a715b81d54efaff6703880c; version=d5c65159f2895379e11ca13f62feabe93278985d <5de2b8c53714ad58f2fda118cd29ebbe31b38665; version=d5c65159f2895379e11ca13f62feabe93278985d <d6625dc5f1fe42cd81b8c57a1f5317afb9b410ce; version=d5c65159f2895379e11ca13f62feabe93278985d <f760b7d7e43584d2fa9bffcec1a04e502609f827

Published CVSS scores

7.7Linux Kernel CVE teamCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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