Is there a patch available for CVE-2026-99155?

Yes, a patch is available for CVE-2026-99155. Update the affected software to the latest version immediately.

Linux CVE-2026-99155

EUVD-2026-111907

2026-10-28 Linux

GHSA-p98p-xmcg-j23c

Denial Of Service Linux

View

Awaiting Data No severity or threat signals available yet. Label will update when CVSS score is published or threat intelligence arrives.

Patch available

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisCVE.org

In the Linux kernel, the following vulnerability has been resolved:

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

scsifront_do_response() validates the rqid in a backend response against VSCSIIF_MAX_REQS before using it to index info->shadow[], but then dereferences the entry to test ->inflight without checking that the slot is populated. Shadow slots are NULL before a command is submitted (the host private area is zeroed at allocation) and are reset to NULL in _scsifront_put_rqid() once a request completes, so an in-range rqid that does not correspond to an outstanding request makes the frontend dereference a NULL pointer.

A malicious or buggy backend can thus crash the guest by returning a response whose rqid is in range but not in flight -- for example a spurious response before any command has been issued, or a duplicate of one already completed. The ring has only VSCSIIF_MAX_REQS (16) slots, so before the first command every in-range rqid selects a NULL slot.

Reject a response whose shadow slot is not populated.

Affected VersionsENISA

Linux patch: 6.18.59

Linux 6d1c2f48f3fcf5f42967938c8ba6b42ac6b44b43 <1d91ec793d6c80eca963d426e0da832d40a062df

Linux patch: 0

Linux 5.19

Linux 6d1c2f48f3fcf5f42967938c8ba6b42ac6b44b43 <8c8222c255772713eb36cde695777a1fce224917

Linux patch: 7.2.13

Linux patch: 7.3

Linux 6d1c2f48f3fcf5f42967938c8ba6b42ac6b44b43 <15791e57f57f7050014d08cfe239d4aa1e6b94b0

Affected Packages

euvd linux no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Know when the next one hits your stack

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Lifecycle Timeline

Patch available

Oct 28, 2026 - 11:02 EUVD

CVE Published

Oct 28, 2026 - 10:35 cve.org

UNKNOWN (no severity yet)

Threat Intelligence Overview

Data Quality

2 sources

Confidence: Low

EUVD

CVE.org

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity Not scored yet

CISA KEV No

Public POC No

EPSS N/A

Patch available Yes

Active threat No

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

Awaiting Data No severity or threat signals available yet. Label will update when CVSS score is published or threat intelligence arrives.