CVE-2022-49657
説明
CVE.org より
In the Linux kernel, the following vulnerability has been resolved: usbnet: fix memory leak in error case usbnet_write_cmd_async() mixed up which buffers need to be freed in which error case. v2: add Fixes tag v3: fix uninitialized buf pointer
詳細
The bug could happen on error path for some specific cases of network links over USB being used. It leads to memory leak only, so the security impact is limited.
軽減策
To mitigate this issue, prevent module usbnet from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
CVSS (Common Vulnerability Scoring System) のスコアの詳細
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 スコアの内訳
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| ベーススコア | 4.7 | 5.5 | 5.5 |
| 攻撃ベクトル | Local | Local | Local |
| 攻撃の複雑さ | High | Low | Low |
| 必要な権限 | Low | Low | Low |
| ユーザー関与レベル | None | None | None |
| 範囲 | Unchanged | Unchanged | Unchanged |
| 機密性 | None | None | None |
| 完全性への影響 | None | None | None |
| 可用性への影響 | High | High | High |
ベクトル
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/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:N/I:N/A:H
脆弱性の原因 (CWE) の理解
Availability
Technical Impact: DoS: Crash, Exit, or Restart; DoS: Instability; DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory)
Most memory leaks result in general product reliability problems, but if an attacker can intentionally trigger a memory leak, the attacker might be able to launch a denial of service attack (by crashing or hanging the program) or take advantage of other unexpected program behavior resulting from a low memory condition.
Other
Technical Impact: Reduce Performance
よくある質問
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