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Suse CVE-2026-62432

| EUVDEUVD-2026-49785 HIGH
Race Condition (CWE-362)
2026-07-28 security@xen.org GHSA-92f9-q54w-fxm8
Denial Of Service Race Condition Suse
7.3
CVSS 3.1 · Vendor: xen
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Vulnerability Assessment

Weakness
CWE
CWE-362
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V15 - Secure Coding and Architecture Concurrency control, locking
MITRE ATT&CK

1 technique across 1 tactic: Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 28, 2026

We are tasked to produce a comprehensive analysis JSON for CVE-2026-62432. We must synthesize all provided data: CVE description, CVSS, tags, SSVC, references, etc. The output must be plain-text strings per field, no arrays, no markdown.

First, parse the input:

  • CVE ID: CVE-2026-62432
  • Description: "The EVTCHNOP_expand_array hypercall checks for whether FIFO event channels are enabled, but without holding the correct lock. It can race with EVTCHNOP_reset, resulting in dereferencing a NULL pointer."
  • CVSS: 7.3, vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
  • CWE: CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'))
  • Reported by: security@xen.org
  • Tags: Denial Of Service, Race Condition
  • SSVC: Exploitation: none, Automatable: yes, Technical Impact: partial
  • ENISA EUVD ID: EUVD-2026-49785
  • References include xenbits advisory, NVD, oss-security. No listed KEV status, no POC mention, no explicit patch version. The patch data is missing (we need to check references? Not provided explicitly. We must infer from multiple sources. The description mentions xen and hypercall, so it's a Xen hypervisor vulnerability.

We need to fill out each field. Let's systematically analyze.

  • product_name: From description, "EVTCHNOP_expand_array hypercall" implies Xen hypervisor. The vulnerability is in Xen's event channel mechanism. So product is "Xen Hypervisor". Could also say "Xen", but "Xen Hypervisor" is 2 words. According to rule "1-3 words ONLY", "Xen Hypervisor" fits.
  • summary: Must be 2-3 sentence plain-language synthesis. Not copy description. Start with impact verb and product. Example: "Race condition in Xen Hypervisor can lead to denial of service via NULL pointer dereference." But also mention what attacker can do. The CVSS suggests partial impacts in C/I/A, so maybe more than DoS? But tags say Denial Of Service, Race Condition, and description says dereferencing NULL pointer, so likely denial of service (sys

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

Vendor (xen) PRIMARY 7.3 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
SUSE 8.5 HIGH
AV:L/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:H

Primary rating from Vendor (xen).

CVSS VectorVendor: xen

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

Lifecycle Timeline

2
CVE Published
Jul 28, 2026 - 13:19 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 28, 2026 - 13:19 cve.org
HIGH 7.3

DescriptionCVE.org

The EVTCHNOP_expand_array hypercall checks for whether FIFO event channels are enabled, but without holding the correct lock. It can race with EVTCHNOP_reset, resulting in dereferencing a NULL pointer.

Threat Intelligence Overview

EPSS Score
0.2%
Top 88% exploitable
Data Quality
4 sources
Confidence: Medium
EUVD NVD CVE.org EPSS Vulnrichment Vendor VulDB

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 HIGH
CISA KEV No
Public POC No
EPSS 0.2%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
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.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
Yes
Human Impact· derived
Medium
Technical Impact
Partial

Priority Score

36
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +36
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Race Condition MEDIUM

Race conditions occur when multiple concurrent requests exploit the brief time gap between checking a condition and acting upon it (TOCTOU - Time of Check, Time of Use).

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Same weakness CWE-362 – Race Condition

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CVE-2023-36884 HIGH POC
7.5
CVE-2016-5195 HIGH POC
7.0
CVE-2017-1000112 HIGH POC
7.0
CVE-2014-0196 MEDIUM POC
5.5
CVE-2014-0226 MEDIUM POC
6.8
CVE-2016-1757 HIGH POC
7.0
CVE-2016-8655 HIGH POC
7.8
CVE-2025-39964 MEDIUM POC
5.5

Same technique Denial Of Service

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CVE-2015-5119 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2012-0507 CRITICAL POC
9.8
CVE-2014-1761 HIGH POC
7.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2011-0609 HIGH POC
7.8

Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Fixed
SUSE Linux Enterprise Micro 5.3 Fixed

References

Advisories & patches
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-62432 ADVISORY https://seclists.org/oss-sec/2026/q3/309 ADVISORY https://vuldb.com/vuln/383871 ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:3409/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:3423/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:3451/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:3462/ REF http://www.openwall.com/lists/oss-security/2026/07/28/21 REF http://xenbits.xen.org/xsa/advisory-505.html REF https://xenbits.xenproject.org/xsa/advisory-505.html

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