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Ubuntu Linux CVE-2025-1218

| EUVDEUVD-2025-211005 LOW
Heap-based Buffer Overflow (CWE-122)
2026-09-24 vendor:ubuntu
3.4
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 model attack chain
  2. Exploit
    Identify affected Ubuntu package from USN
  3. Impact
    Determine attack vector and impact

Vulnerability Assessment

Weakness
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Heap buffer bounds checking
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 from available data. The description is missing, so no product feature, protocol, configuration setting, deployment mode, authentication level, or user-interaction requirement can be identified. Retrieve the Ubuntu Security Notice and NVD entry for CVE-2025-1218 to establish the concrete prerequisites and limiting factors.

Impact

Risk cannot be meaningfully assessed from the provided data. The only available signal is that CVE-2025-1218 was tracked/reported by the Ubuntu security team (vendor:ubuntu), which implies it affects a package shipped in the Ubuntu ecosystem, but no description, CWE, CVSS base score, or CVSS vector was supplied. No EPSS score, no CISA KEV listing, and no POC indicator are present in the input. Because attack vector, complexity, privilege requirement, and technical impact are all unknown, it is impossible to judge whether this is a genuine priority or a low-real-world-risk issue. This should be treated as UNSCORED/UNTRIAGED: the absence of KEV and EPSS is not evidence of low risk, and the absence of CVSS is not evidence of high risk - the record is simply incomplete. Recommend pulling the authoritative Ubuntu Security Notice (USN) and the NVD/MITRE record before making any remediation decision.

Exploit ScenarioDerived

No exploit scenario can be constructed because the vulnerability class, affected component, and attack vector are all unknown in the provided data. No public exploit is indicated in the input. Analysts must retrieve the Ubuntu Security tracker entry for CVE-2025-1218 to determine the affected package and mechanism before modeling any attack.

Monitor Track and reassess. Why: LOW severity (CVSS 0.1-3.9).
Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 25, 2026

CVE-2025-1218 is attributed solely to Ubuntu in the available intelligence, with no published description, CVSS vector, CWE classification, CPE data, or reference links, so the concrete security impact cannot be established from the supplied data. Because no affected package, version range, or vulnerable component is identified, neither the attack surface nor the prerequisites (authentication level, network exposure, user interaction) can be scoped for any Ubuntu release. No public exploit code was identified and there is no evidence of active exploitation (no CISA KEV entry) at time of analysis, but the identifier should be treated as unscored rather than low risk until the Ubuntu Security Notice and NVD entry are retrieved.

RemediationAI

Patch availability is unconfirmed: no fix version, USN number, or advisory URL was included in the provided intelligence, so no exact upgrade target can be cited. The primary action is to resolve the intelligence gap by pulling the Ubuntu CVE tracker page and NVD entry for CVE-2025-1218, identifying the affected source package, and then applying the fixed version via the normal Ubuntu update path - on modern releases run 'apt update && apt upgrade' (or install the specific package version named in the USN), and on interim or unsupported series verify whether Ubuntu Pro/ESM coverage applies before relying on the standard archive. As a standing compensating control while scope is unknown, enable unattended-upgrades with the security pocket on all Ubuntu hosts so the eventual fix installs without manual intervention, and subscribe to the Ubuntu Security Notices feed or consume the Ubuntu OVAL/machine-readable data into your vulnerability scanner to get automatic detection when the USN lands. If the package is later found to be network-facing, temporarily restricting inbound access to the affected service's port via firewall or security group is a reversible containment step, but it will break legitimate clients of that service and should be lifted as soon as the patched version is available. There is no basis in the available data for disabling any specific feature, since the vulnerable component has not been identified.

Affected VersionsENISA

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

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

Ubuntu is a Debian-derived Linux distribution whose vulnerabilities are triaged and published through Ubuntu Security Notices (USNs) and the Ubuntu CVE tracker, which map upstream CVE identifiers to specific source packages across each supported release series (LTS and interim). Because this record carries no CWE, no CPE string, and no description, the root-cause class cannot be determined: it is unknown whether the issue is a memory-safety defect in a native library, an injection or access-control flaw in a packaged web application, a privilege-escalation issue in a system daemon, or a dependency-level vulnerability inherited from Debian upstream. The absence of a CPE also means the affected package - and therefore whether the vulnerable code runs in the kernel, in a userland service listening on the network, or in a client-side utility - is entirely unconfirmed. Practically, CVE-2025-1218 must be treated as an unresolved pointer into the Ubuntu security ecosystem until the corresponding USN supplies the package name, fixed version, and Ubuntu release matrix; only then can the exposure model (local vs. remote, authenticated vs. unauthenticated, default vs. non-default configuration) be reconstructed.

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Severity by source

Vendor (vendor:ubuntu) PRIMARY 3.4 LOW
AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N

Primary rating from Vendor (vendor:ubuntu) · only source for this CVE.

CVSS VectorVendor: vendor:ubuntu

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

Lifecycle Timeline

2
Patch available
Sep 25, 2026 - 22:04 EUVD
CVSS changed
Sep 25, 2026 - 21:22 NVD
3.4 (LOW)

DescriptionCVE.org

[Unknown description]

Threat Intelligence Overview

EPSS Score
0.2%
Top 93% 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 LOW
CISA KEV No
Public POC No
EPSS 0.2%
Patch available Yes
Active threat No
Deciding rule
LOW severity (CVSS 0.1-3.9)
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
Controlled
Automatable· derived
No
Human Impact· derived
Low

Priority Score

17
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +17
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

A heap overflow occurs when a program writes data beyond the bounds of a buffer allocated in the heap memory region.

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