CVE-2026-90098

Kernel warnings via atomic-context mutex acquisition

Published Sep 17, 2026 · Updated Sep 17, 2026

Atomic-context sleeping in the Linux Sparx5 driver allows local users to trigger kernel warnings via receive-mode updates. sparx5_set_rx_mode() synchronizes multicast addresses while holding netif_addr_lock_bh, then invokes MAC-table operations that acquire a blocking mutex and perform sleeping register polls. The path requires a Sparx5 interface; the published debug trace demonstrates an invalid-context warning, not a confirmed hang or crash.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Atomic-context sleeping in the Linux Sparx5 driver allows local users to trigger kernel warnings via receive-mode updates. sparx5_set_rx_mode() synchronizes multicast addresses while holding netif_addr_lock_bh, then invokes MAC-table operations that acquire a blocking mutex and perform sleeping register polls. The path requires a Sparx5 interface; the published debug trace demonstrates an invalid-context warning, not a confirmed hang or crash.

The record

CVE
CVE-2026-90098
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

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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=5.14
  2. Affected versionversion=d6fce5141929697a27f029c633433d487f6f62cb <648d196ccc03ae3b04402ae71ffa44959a85e88f
  3. Affected versionversion=d6fce5141929697a27f029c633433d487f6f62cb <b62793a7baeea9cf20209c9fd2e333311aaf3b8d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.14; version=d6fce5141929697a27f029c633433d487f6f62cb <648d196ccc03ae3b04402ae71ffa44959a85e88f; version=d6fce5141929697a27f029c633433d487f6f62cb <b62793a7baeea9cf20209c9fd2e333311aaf3b8d

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/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
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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Your stack

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