VulnerabilityPublished 17 Sep 2026Updated 19 Oct 2026

CVE-2026-93097: Linux kernel · cxl/mbox: Break poison list loop on an empty payload

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in e77594e0cea67ab1c2317a27aa77a744e26ad6a6 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in e77594e0cea67ab1c2317a27aa77a744e26ad6a6, 86771c105293ca26bfcc320b4f60d32c137b54aa, 42eab80981f4d2ac820e253e80ecf92f8cd91f69 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ ed83f7ca398b3798b82c1d5d1113011c0e5a2198, < e77594e0cea67ab1c2317a27aa77a744e26ad6a6	Fixed in e77594e0cea67ab1c2317a27aa77a744e26ad6a6
LinuxLinux	Affected ≥ ed83f7ca398b3798b82c1d5d1113011c0e5a2198, < 86771c105293ca26bfcc320b4f60d32c137b54aa	Fixed in 86771c105293ca26bfcc320b4f60d32c137b54aa
LinuxLinux	Affected ≥ ed83f7ca398b3798b82c1d5d1113011c0e5a2198, < 42eab80981f4d2ac820e253e80ecf92f8cd91f69	Fixed in 42eab80981f4d2ac820e253e80ecf92f8cd91f69
LinuxLinux	Affected ≥ ed83f7ca398b3798b82c1d5d1113011c0e5a2198, < 8b301c4afbce4bc3f94528441d8d5ce1366504ad	Fixed in 8b301c4afbce4bc3f94528441d8d5ce1366504ad
LinuxLinux	Affected ≥ ed83f7ca398b3798b82c1d5d1113011c0e5a2198, < 6ad491cef1a812cf7b53aa769cd8869516c47362	Fixed in 6ad491cef1a812cf7b53aa769cd8869516c47362
LinuxLinux	Affected =6.4	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: cxl/mbox: Break poison list loop on an empty payload A device that returns count == 0 with CXL_POISON_FLAG_MORE set on every iteration never advances nr_records, so the max_errors guard never trips and the do/while loops forever while holding poison.mutex. That hangs the sysfs-triggered scan thread and blocks all subsequent poison operations on the device. The existing "Protect against an uncleared _FLAG_MORE" guard was intended to bound a misbehaving device but does not cover the count == 0 case. Stop the loop on an empty payload so a malfunctioning or malicious device cannot wedge the poison scan.

References

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