CVE-2021-47201
Description
A flaw was found in the Linux kernel's Intel Adaptive Virtual Function (iavf) driver. A local user with administrative privileges can trigger a Denial of Service (DoS) resulting from a kernel crash when disabling and subsequently restoring a virtual network interface. This issue is caused by the driver releasing queue resources in an incorrect order during interface deactivation, which leaves the driver in an inconsistent state when re-enabling the interface.
Statement
This vulnerability is rated as Low severity because triggering the issue requires local administrative privileges, specifically CAP_NET_ADMIN capabilities, and is confined to systems equipped with Intel SR-IOV virtual network hardware. An attacker with privileged access could cause a kernel panic and host denial of service during interface state changes, but this does not lead to confidentiality or integrity breaches. Because privileged users already possess significant system control, the security risk to standard Red Hat deployments remains low.
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 | 4.4 | 5.5 | 7.8 |
| Attack Vector | Local | Local | Local |
| Attack Complexity | Low | Low | Low |
| Privileges Required | High | Low | Low |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | None | None | High |
| Integrity Impact | None | None | High |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/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
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