CVE-2026-68098
Description
A flaw was found in ksmbd, a Linux kernel module. The set_ntacl_dacl() function, which processes Discretionary Access Control Lists (DACLs), can stop copying Access Control Entries (ACEs) prematurely due to a size accounting overflow. This can cause a subsequent deduplication process to read beyond the intended memory buffer, potentially leading to an out-of-bounds read. This issue could result in a denial of service or information disclosure.
Statement
This issue affects ksmbd (in-kernel SMB server). DACL dedup walks past copied ACEs when size accounting truncates the output DACL, causing OOB read of buffer tail. Requires ksmbd with NT ACL handling.
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 | 5.5 | N/A | 8.8 |
| Attack Vector | Local | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | High |
| Integrity Impact | None | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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