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Ubuntu EUVDEUVD-2026-87322

| CVE-2026-6103 MEDIUM
Integer Overflow or Wraparound (CWE-190)
2026-09-24 vendor:ubuntu
4.3
CVSS 3.1 · Vendor: vendor:ubuntu
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Insufficient data to determine attack chain
  2. Exploit
    Enrich CVE from Ubuntu Security Tracker and NVD
  3. Impact
    Re-assess once product and CVSS vector are known

Vulnerability Assessment

Weakness
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Integer overflow checks
MITRE ATT&CK

1 technique across 1 tactic: Execution

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

Exploitation Conditions

Cannot be determined - the input contains no description, no CVSS vector, and no CWE, so no specific product feature, protocol, configuration setting, deployment mode, authentication level, or user-interaction requirement can be identified. Authentication requirements are not confirmed from available data (no CVSS vector present). Obtain the vulnerability details from the Ubuntu Security Tracker entry for CVE-2026-6103 and the corresponding NVD record to establish concrete prerequisites and limiting factors.

Impact

Risk cannot be meaningfully assessed from the available data. The only intelligence signal is that the CVE was reported/tracked by the Ubuntu security team (vendor:ubuntu), which suggests it affects a software package shipped in the Ubuntu/Debian ecosystem - but the specific product, description, CWE, and CVSS vector are all absent. With no CVSS vector there is no way to reason about attack vector, complexity, or privilege requirements; with no EPSS score there is no exploitation-probability signal; there is no CISA KEV listing and no POC indicator in the input. Exploitation status is therefore 'no public exploit identified at time of analysis'. This means the item cannot currently be triaged as either a genuine priority or a high-CVSS-but-low-real-risk issue - it is simply under-characterized. CRITICAL GAP: description, CVSS, and CWE are all missing; the CVE must be enriched from the Ubuntu Security Tracker (ubuntu.com/security/CVE-2026-6103) and NVD before any risk decision is made. Do NOT treat the absence of KEV/EPSS/POC as evidence of low risk - it is absence of data, not absence of threat.

Exploit ScenarioDerived

No exploit scenario can be constructed because the affected product, vulnerability class, and attack vector are all unknown in the provided data. No public exploit code is indicated in the input. Enrichment from the Ubuntu Security Tracker and NVD is required before a realistic scenario can be described.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 25, 2026

CVE-2026-6103 is an as-yet uncharacterized security issue in software distributed and maintained through Ubuntu, reported to this pipeline solely by the Ubuntu vendor feed with no accompanying description, CVSS vector, or CWE classification. Because the report carries no affected package name, no version range, and no attack-vector metadata, it is not possible to state who is affected beyond Ubuntu users of whatever component the Ubuntu Security Tracker assigns to this CVE, or what an attacker could achieve. No public exploit identified at time of analysis, no CISA KEV entry is present, and no EPSS score was supplied; risk cannot be meaningfully assessed from the available data until the Ubuntu Security Tracker entry (and the corresponding NVD record) is retrieved.

RemediationAI

No vendor-released patch identified at time of analysis, and no fix version can be cited because the input contains no patch reference, no affected package name, and no upstream commit. The immediately actionable step is to retrieve the authoritative record - the Ubuntu Security Tracker entry for CVE-2026-6103 and the associated Ubuntu Security Notice - to learn which source package and which Ubuntu releases are affected, then apply the fixed package versions once Canonical publishes them. Until that information exists, operators of Ubuntu systems should keep the standard security pocket enabled, run apt update followed by apt list --upgradable to surface a pending USN-driven upgrade, and consider enabling unattended-upgrades for security pockets; the trade-off is that automatic upgrades can restart services and alter package versions without a maintenance window. If the eventual advisory identifies a network-facing daemon, a reasonable interim compensating control is to restrict that service to trusted network segments or localhost via UFW/nftables or systemd socket binding, accepting the loss of legitimate remote access that this entails; if the advisory instead turns out to describe a local privilege-escalation or desktop issue, firewall restrictions will not help and the only meaningful mitigation will be rapid patching plus audit of untrusted local users. Do not treat this analysis as a basis for emergency action beyond monitoring and verification of the vendor record.

Affected VersionsENISA

PHP 8.2.* <8.2.34
PHP 8.4.* <8.4.26
PHP 8.5.* <8.5.11
PHP 8.3.* <8.3.35

Affected Packages

euvd php_8_2 fix: 8.2.34
euvd php_8_3 fix: 8.3.35
euvd php_8_4 fix: 8.4.26
euvd php_8_5 fix: 8.5.11

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 4 packages in euvd

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

Technical ContextAI · show details

The only intelligence available is the attribution 'vendor:ubuntu', which indicates this CVE is tracked by Canonical's Ubuntu security team and will be published, if applicable, as an Ubuntu Security Notice (USN) covering one or more source packages in the Ubuntu archive. No CPE strings were provided, so no upstream project, library, protocol, or component can be identified, and no CWE was supplied, so the root-cause class (for example injection, memory corruption, improper access control, or race condition) is unknown. Because there is no CVSS vector, authentication requirements are not confirmed from available data, and no network reachability, user-interaction, or configuration prerequisite can be inferred. Analysts should treat this record as a placeholder: its technical meaning is only obtainable by looking up CVE-2026-6103 directly in the Ubuntu CVE tracker and NVD, where the affected package, affected Ubuntu releases, and upstream fix commit would normally be enumerated.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (vendor:ubuntu) PRIMARY 4.3 MEDIUM
AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
SUSE 4.0 MEDIUM
AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Red Hat 4.3 MEDIUM

Primary rating from Vendor (vendor:ubuntu).

CVSS VectorVendor: vendor:ubuntu

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None

Lifecycle Timeline

1
Patch available
Sep 25, 2026 - 21:18 EUVD

DescriptionCVE.org

[Unknown description]

Threat Intelligence Overview

EPSS Score
0.2%
Top 95% exploitable
Data Quality
6 sources
Confidence: High

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 MEDIUM
CISA KEV No
Public POC No
EPSS 0.2%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
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
Defer
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

22
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +22
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Integer overflow occurs when an arithmetic operation produces a result that exceeds the maximum value a given integer type can store.

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP6-LTSS Affected

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