CVE-2026-93097Hinoki check available

Poison-scan hang via empty mailbox response loop

Published Sep 17, 2026 · Updated Sep 17, 2026

An infinite loop in Linux CXL mailbox handling allows attackers to hang poison scans through crafted device responses. In drivers/cxl/core/mbox.c, zero records with CXL_POISON_FLAG_MORE keep the record counter unchanged while poison.mutex stays locked. A malicious CXL device and a sysfs-triggered scan are required; subsequent poison operations on that device remain blocked.

CVSS severity2.3
Low
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

An infinite loop in Linux CXL mailbox handling allows attackers to hang poison scans through crafted device responses. In drivers/cxl/core/mbox.c, zero records with CXL_POISON_FLAG_MORE keep the record counter unchanged while poison.mutex stays locked. A malicious CXL device and a sysfs-triggered scan are required; subsequent poison operations on that device remain blocked.

The record

CVE
CVE-2026-93097
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
Unavailable
Privileges
Unavailable

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=6.4
  2. Affected versionversion=ed83f7ca398b3798b82c1d5d1113011c0e5a2198 <42eab80981f4d2ac820e253e80ecf92f8cd91f69
  3. Affected versionversion=ed83f7ca398b3798b82c1d5d1113011c0e5a2198 <6ad491cef1a812cf7b53aa769cd8869516c47362
  4. Affected versionversion=ed83f7ca398b3798b82c1d5d1113011c0e5a2198 <86771c105293ca26bfcc320b4f60d32c137b54aa
  5. Affected versionversion=ed83f7ca398b3798b82c1d5d1113011c0e5a2198 <8b301c4afbce4bc3f94528441d8d5ce1366504ad
  6. Affected versionversion=ed83f7ca398b3798b82c1d5d1113011c0e5a2198 <e77594e0cea67ab1c2317a27aa77a744e26ad6a6

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=6.4; version=ed83f7ca398b3798b82c1d5d1113011c0e5a2198 <42eab80981f4d2ac820e253e80ecf92f8cd91f69; version=ed83f7ca398b3798b82c1d5d1113011c0e5a2198 <6ad491cef1a812cf7b53aa769cd8869516c47362; version=ed83f7ca398b3798b82c1d5d1113011c0e5a2198 <86771c105293ca26bfcc320b4f60d32c137b54aa; version=ed83f7ca398b3798b82c1d5d1113011c0e5a2198 <8b301c4afbce4bc3f94528441d8d5ce1366504ad; version=ed83f7ca398b3798b82c1d5d1113011c0e5a2198 <e77594e0cea67ab1c2317a27aa77a744e26ad6a6

Published CVSS scores

2.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L

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

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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Your stack

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