CVE-2026-97515

CPU lockup via false SLVSTART interrupt loop

Published Sep 24, 2026 · Updated Sep 24, 2026

Denial of service in the Linux kernel before 6.18.53 allows attackers to lock a CPU through an I3C target holding SDA low on NPCM845. In svc_i3c_master_ibi_isr(), the Master Request path emits STOP without clearing quirk-induced SLVSTART, so each handler pass triggers another interrupt. Reachability requires NPCM845 hardware with the false-SLVSTART quirk and a target stuck holding SDA low; the resulting IRQ storm can leave the CPU unresponsive.

CVSS severityUnavailable
Unscored
EPSS probability0.14%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel before 6.18.53 allows attackers to lock a CPU through an I3C target holding SDA low on NPCM845. In svc_i3c_master_ibi_isr(), the Master Request path emits STOP without clearing quirk-induced SLVSTART, so each handler pass triggers another interrupt. Reachability requires NPCM845 hardware with the false-SLVSTART quirk and a target stuck holding SDA low; the resulting IRQ storm can leave the CPU unresponsive.

The record

CVE
CVE-2026-97515
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 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=0 <6.18.53
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1effa3adfe53cb2bb28bf5640a676b791d5ab405
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e9b139c4684ed8593a0b779ca02ea05f460b2eec

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=0 <6.18.53; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1effa3adfe53cb2bb28bf5640a676b791d5ab405; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e9b139c4684ed8593a0b779ca02ea05f460b2eec

Published CVSS scores

No CVSS assessment is available in this record.

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)
VectorUnavailable
PrivilegesUnavailable
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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