CVE-2026-93093Hinoki check available

Kernel crash via premature SCMI receive callbacks

Published Sep 17, 2026 · Updated Sep 17, 2026

A setup race in Linux ARM SCMI allows local users to crash the kernel when an interrupt arrives before channel initialization finishes. mailbox_chan_setup() and smc_chan_setup() enable callbacks before publishing channel state, while scmi_chan_setup() leaves cinfo->handle unset until transport setup returns. Vendor assessments require high local privileges, and a pending or spurious callback must arrive during setup to trigger the NULL-pointer fault.

CVSS severity5.6
Medium
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

A setup race in Linux ARM SCMI allows local users to crash the kernel when an interrupt arrives before channel initialization finishes. mailbox_chan_setup() and smc_chan_setup() enable callbacks before publishing channel state, while scmi_chan_setup() leaves cinfo->handle unset until transport setup returns. Vendor assessments require high local privileges, and a pending or spurious callback must arrive during setup to trigger the NULL-pointer fault.

The record

CVE
CVE-2026-93093
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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

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=5.7
  2. Affected versionversion=5c8a47a5a91d4d6e185f758d61997613d9c5d6ac <0314900dcdde044af0208fed212035dbfaa55843
  3. Affected versionversion=5c8a47a5a91d4d6e185f758d61997613d9c5d6ac <1bea027f7ef6fb889628b16c568a5f7c07a51b30
  4. Affected versionversion=5c8a47a5a91d4d6e185f758d61997613d9c5d6ac <6f3f532531e4a27d28a2240719d1b05ac11766c6
  5. Affected versionversion=5c8a47a5a91d4d6e185f758d61997613d9c5d6ac <a1bc587568a4e373db76261dc9561dfc3653917f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=5.7; version=5c8a47a5a91d4d6e185f758d61997613d9c5d6ac <0314900dcdde044af0208fed212035dbfaa55843; version=5c8a47a5a91d4d6e185f758d61997613d9c5d6ac <1bea027f7ef6fb889628b16c568a5f7c07a51b30; version=5c8a47a5a91d4d6e185f758d61997613d9c5d6ac <6f3f532531e4a27d28a2240719d1b05ac11766c6; version=5c8a47a5a91d4d6e185f758d61997613d9c5d6ac <a1bc587568a4e373db76261dc9561dfc3653917f

Published CVSS scores

4.1Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
4.1SUSECVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
5.6SUSECVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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

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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