🛡️ CVE-2026-42494

🟡 CVSS 6.1 — Medium ✅ No Known Exploit CWE-125 NVD
6.1
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability high.

Weakness class

CVE-2026-42494 is classified as CWE-125: Out-of-bounds Read. The code reads past the limits of a buffer, exposing adjacent memory contents or crashing the process.

Affected software

CVE-2026-42494 is recorded against 1 package.

  • unknown

Timeline and source

Published on 28 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

xenbits.xenproject.org

Details

Severity MEDIUM
CVSS Score 6.1
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
CWE CWE-125
Public Exploit ✅ No
Source NVD
Published 2026-07-28
Updated 2026-08-11
Modified 2026-07-28
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —

Similar Threats

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