CVE-2026-42495
Received Received - Intake

Buffer Overflow in libfsimage ISO9660 Driver

Publication date: 2026-07-28

Last updated on: 2026-07-28

Assigner: Xen Project

Description
[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] The directory and Rock Ridge / SUSP walk in libfsimage's iso9660 driver derives several lengths directly from attacker-controlled on-disk fields without validating them: * The directory loop itself assumes a good record length. This is CVE-2026-42494. * The calculation of the System Use area may underflow. This is CVE-2026-42495. * The Rock Ridge extension loop assumes a good (inner) record length. This is CVE-2026-62423. * The Rock Ridge NM record processing assumes a good entry length. This is CVE-2026-62424. * The Rock Ridge CE record processing assumes a good size and offset. This is CVE-2026-62425.

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Meta Information

Published
2026-07-28
Last Modified
2026-07-28
Generated
2026-07-28
AI Q&A
2026-07-28
EPSS Evaluated
N/A
NVD
CVE-2026-42495
EUVD
EUVD-2026-49773

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
xen libfsimage *

Helpful Resources

Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

CVE-2026-42495 is a vulnerability in the libfsimage's iso9660 driver where the calculation of the System Use area may underflow due to attacker-controlled on-disk fields being used without validation.

Detection Guidance

This vulnerability involves underflow in the System Use area calculation in libfsimage's iso9660 driver. Detection requires examining ISO9660 filesystem images for malformed System Use area records. No direct network or system commands are provided in the context to detect this issue.

Impact Analysis

This vulnerability could allow an attacker to cause a system crash or potentially execute arbitrary code by manipulating the on-disk data processed by the iso9660 driver.

Compliance Impact

The vulnerability involves underflow in calculating the System Use area within the iso9660 driver, which could lead to memory corruption or undefined behavior. This does not directly impact compliance with GDPR or HIPAA, as those standards focus on data protection and privacy rather than low-level system vulnerabilities.

Mitigation Strategies

Apply patches or updates from Xen.org to address the vulnerability in libfsimage's iso9660 driver. Disable or restrict access to vulnerable systems until patched.

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