CVE-2026-43374
説明
A flaw was found in the Linux kernel's networking (net: nexthop) component. When a nexthop is removed from a group, the system prematurely frees per-CPU (percpu) statistics memory. This timing issue allows other parts of the kernel that are still referencing the old group to access and potentially corrupt the freed memory. This use-after-free vulnerability can lead to system instability or a denial of service.
詳細
Red Hat acknowledges the upstream Linux kernel correction for «net» as described in COMMENT_ZERO. Fixes are delivered through standard kernel errata for supported products. Operational exposure depends on whether this subsystem or driver is active in your configuration.
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).
以下の CSVV メトリクスおよびスコアは予備的で、再検討の対象となります。
CVSS v3 スコアの内訳
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| ベーススコア | 5.5 | N/A | 7.8 |
| 攻撃ベクトル | Local | N/A | Local |
| 攻撃の複雑さ | Low | N/A | Low |
| 必要な権限 | Low | N/A | Low |
| ユーザー関与レベル | None | N/A | None |
| 範囲 | Unchanged | N/A | Unchanged |
| 機密性 | None | N/A | High |
| 完全性への影響 | None | N/A | High |
| 可用性への影響 | High | N/A | High |
ベクトル
Red Hat: 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
脆弱性の原因 (CWE) の理解
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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