CVE-2026-46301VulnerabilityPublished 2 Jun 2026Updated 23 Jun 2026

Microsoft · spi: topcliff-pch: fix use-after-free on unbind

Affects MicrosoftSource GCVE Database

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Not known to be exploited.

Data as of 30 Oct 2026, 06:59 UTC

Severity

Medium

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.1% chance of exploitation in 30 days – higher than 1% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
CVE published 2 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 29 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), 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.

microsoft-security-response-ce

What to do

Affected software

Product	Affected	Fixed in
Microsoft Security Response Center Microsoft	Affected =3.0	Fixed in–

Description

CVE-2026-46301 is a use-after-free vulnerability in the spi: topcliff-pch component affecting certain Microsoft and Azure Linux kernel versions. The vulnerability involves improper memory handling during unbind operations, which could potentially lead to instability or other unintended behavior. No CVSS score or detailed impact information is provided. There is no indication of known exploitation in the wild or an available patch at this time.

Impact

The vulnerability could cause system instability or crashes due to use-after-free memory access in the affected kernel component. There is no evidence of active exploitation in the wild. The exact impact on confidentiality, integrity, or availability is not detailed in the provided information.

Summary

This vulnerability, identified as CVE-2026-46301, concerns a use-after-free flaw in the spi: topcliff-pch driver component. The issue occurs during the unbind process, where memory is freed but subsequently accessed, leading to potential memory corruption or system instability. The affected products include Microsoft and Azure Linux kernel versions, specifically noted as Azure Linux 3.0 and azl3 kernel 0:6.6.139.1-1.azl3.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 25 Oct 2026, 20:15 UTC

Technical details

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