CVE-2025-68340
Description
A flaw was found in the Linux kernel's network team driver. A local user with network administration privileges can trigger this flaw by attempting to add an already active network device to a team interface. Because the driver modifies internal configuration settings before completing validation checks, the failed addition leaves the interface in an inconsistent state. Subsequent network traffic sent through the interface can cause the kernel to crash or hang, resulting in a Denial of Service (DoS).
Statement
This vulnerability is rated as Moderate severity because triggering the flaw requires local administrative privileges (specifically CAP_NET_ADMIN) or access to unprivileged user namespaces to manipulate network interface configurations. In standard Red Hat Enterprise Linux environments, an administrator must attempt to add an already active network device to a team interface, leaving the interface in an inconsistent header state. The resulting impact is confined to a local denial of service caused by a kernel crash or hang, without exposing confidential data or permitting arbitrary code execution.
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 | 4.7 | 5.5 | 7.8 |
| Attack Vector | Local | Local | Local |
| Attack Complexity | High | Low | Low |
| Privileges Required | High | Low | Low |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | None | None | High |
| Integrity Impact | Low | None | High |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
NVD: 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: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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