5.5

CVE-2026-42495

buffer overruns in libfsimage iso9660 handling

[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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerXen
≫
Produkt Xen
Default Statusunknown
Version consult Xen advisory XSA-497
Status unknown
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.21% 0.107
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
CISA-ADP 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CWE-191 Integer Underflow (Wrap or Wraparound)

The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.

https://xenbits.xenproject.org/xsa/advisory-497.html