CVE-2026-89778

kernel: isofs: fix out-of-bounds page array access on empty zisofs block

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Severity

Low

Red Hat Product Security

6.1

CVSS 3.1

Review impact separately from score.

Published · September 16, 2026

Updated · October 17, 2026

Description

A flaw was found in the Linux kernel's isofs (ISO 9660 file system) component, specifically within the zisofs decompression logic. A local attacker could exploit this vulnerability by mounting a specially crafted ISO9660 image. When a compressed file on such an image contains a malformed 'ZF' Rock Ridge record, it can lead to an out-of-bounds read during block decompression. This issue could result in a system crash, causing a Denial of Service (DoS).

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 6.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H

CWE-125 · Out-of-bounds Read