CVE-2026-98214
Description
A flaw was found in the Linux kernel. A local user can bypass Security-Enhanced Linux (SELinux) access controls to execute restricted files on stacked filesystems. When modifying memory protections using the mprotect() system call, the kernel fails to recheck security permissions on intermediate layers of layered filesystems. This flaw allows an attacker to map a restricted file without execution permissions and subsequently mark it executable, bypassing established security policies to execute unauthorized code.
Statement
This flaw is rated with Moderate severity because exploitation requires existing local system access and depends on non-default environments utilizing nested stacked filesystem configurations alongside specialized SELinux policy rules. Standard Red Hat Enterprise Linux deployments do not typically utilize multi-tiered overlay mounts with granular execution denials assigned to intermediate backing layers. Consequently, the risk of an authenticated local attacker successfully circumventing security policy constraints to run unauthorized code is confined to these specialized configurations.
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 | 7 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | High | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | High | N/A | N/A |
| Integrity Impact | High | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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