CVE-2026-42495

[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.