CVE-2024-47745
Description
A flaw was found in the remap_file_pages function in mm/mmap.c in the Linux kernel, where it does not properly restrict execute access. This vulnerability allows local users to bypass intended SELinux W^X policy restrictions.
Statement
This issue affects the Linux kernel shipping with Red Hat Enterprise Linux 8 and 9.
This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and before.
This flaw breach confidentiality due to bypassing incorrect SELinux policy.
Red Hat has assessed the severity as moderate for the following reasons.
1.First, while the vulnerability allows a bypass of security enforcement (W^X via SELinux), it must be triggered under a narrow sequence: the process must use READ_IMPLIES_EXEC personality and then call remap_file_pages() on RW pages. That is not necessarily common in many workloads.
- Even if a bypass is possible, it does not necessarily guarantee full root escalation or total system compromise; the benefit depends on what code or memory segments can be manipulated, if at all.
Mitigation
The issue exists if SELinux W^X policy restrictions are being used.
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).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 4.7 | 7.8 | 7.8 |
| Attack Vector | Local | Local | Local |
| Attack Complexity | High | Low | Low |
| Privileges Required | Low | Low | Low |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | High | High | High |
| Integrity Impact | None | High | High |
| Availability Impact | None | High | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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
Understanding the Weakness (CWE)
Other
Technical Impact: Other; Alter Execution Logic
Frequently Asked Questions
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