CVE-2025-38024
Description
A flaw was found in the Linux kernel's Remote Direct Memory Access (RDMA) subsystem, specifically within the rxe component. This use-after-free vulnerability occurs in the rxe_create_cq function. When the rxe_cq_from_init function fails, the subsequent call to rxe_cleanup attempts to free memory resources that have already been released, leading to memory corruption. A local attacker with high privileges could exploit this flaw to cause a denial of service or potentially achieve arbitrary code execution.
Statement
Moderate: A use-after-free leading to a kernel information leak issue was seen in the Linux kernel's RDMA rxe component, which allows a local attacker with special group privilege to cause a denial of service. This flaw affects Red Hat Enterprise Linux 7, 8, and 9.
Mitigation
To mitigate this issue, prevent the `rxe` kernel module from loading. This can be achieved by creating a blacklist rule.
1. Create a file `/etc/modprobe.d/blacklist-rxe.conf` with the following content:
blacklist rxe2. Rebuild the initial ramdisk:
install rxe /bin/true
bash3. Reboot the system for the changes to take effect.
dracut -f -v
Warning: Blacklisting the `rxe` module may impact functionality that relies on Soft RoCE.
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 | 7.3 | 7.8 | 7.8 |
| Attack Vector | Local | Local | Local |
| Attack Complexity | Low | Low | Low |
| Privileges Required | Low | Low | Low |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | High | High | High |
| Integrity Impact | Low | High | High |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
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)
Confidentiality
Technical Impact: Read Memory
If the expired pointer is used in a read operation, an attacker might be able to control data read in by the application.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
If the expired pointer references a memory location that is not accessible to the product, or points to a location that is "malformed" (such as NULL) or larger than expected by a read or write operation, then a crash may occur.
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
If the expired pointer is used in a function call, or points to unexpected data in a write operation, then code execution may be possible.
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