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CVE-2026-99155VulnerabilityPublished

Microsoft · scsi: xen/scsifront: Check for a NULL shadow entry on a backend response

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-99155· Medium

Not known to be exploited · fixed in 15791e57f57f7050014d08cfe239d4aa1e6b94b0 : update Microsoft when convenient.

Data as of 29 Oct 2026, 11:47 UTC

Severity
Medium

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in 15791e57f57f7050014d08cfe239d4aa1e6b94b0, 8c8222c255772713eb36cde695777a1fce224917, 1d91ec793d6c80eca963d426e0da832d40a062df

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 28 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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.

What to do

Upgrade Linux to 15791e57f57f7050014d08cfe239d4aa1e6b94b0, 8c8222c255772713eb36cde695777a1fce224917 or 1d91ec793d6c80eca963d426e0da832d40a062df.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 6d1c2f48f3fcf5f42967938c8ba6b42ac6b44b43, < 15791e57f57f7050014d08cfe239d4aa1e6b94b0
Fixed in
  • 15791e57f57f7050014d08cfe239d4aa1e6b94b0
LinuxLinuxAffected
  • ≥ 6d1c2f48f3fcf5f42967938c8ba6b42ac6b44b43, < 8c8222c255772713eb36cde695777a1fce224917
Fixed in
  • 8c8222c255772713eb36cde695777a1fce224917
LinuxLinuxAffected
  • ≥ 6d1c2f48f3fcf5f42967938c8ba6b42ac6b44b43, < 1d91ec793d6c80eca963d426e0da832d40a062df
Fixed in
  • 1d91ec793d6c80eca963d426e0da832d40a062df
LinuxLinuxAffected
  • =5.19
Fixed in–
Debiandebian/linuxpkg:deb/debian/linuxOther threatsAffected
  • =5.19
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

This vulnerability involves the SCSI subsystem in Microsoft software, specifically related to the xen/scsifront component, where a NULL shadow entry check on a backend response is missing or inadequate. The advisory does not provide detailed technical information or impact specifics.

References

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