CVE-2026-64322
Description
A flaw was found in the Linux kernel's Universal Disk Format (UDF) filesystem. The udf_load_sparable_map() function incorrectly validates the length of the sparing table, treating it as a byte count instead of an entry count. This allows a local attacker, by providing a specially crafted UDF image, to trigger an out-of-bounds read and write. This can lead to memory corruption, potentially resulting in a denial of service or arbitrary code execution.
Statement
This issue is triggered by a specially crafted disk image containing on-disk metadata inconsistencies. Exploitation requires that an attacker convince a user to download and use a malicious image from an untrusted source, a scenario with limited practical impact. Red Hat rates this as Low severity.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.7 | N/A | 7.8 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | High | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | Required | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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