CVE-2026-43339
Description
A flaw was found in the Linux kernel's IPv6 networking subsystem. Specifically, a Use-after-Free (UaF) vulnerability exists within the addrconf_permanent_addr() function. This issue arises when the system attempts to access an IPv6 address after it has been freed, which could allow an attacker to cause a denial of service or potentially execute arbitrary code.
Statement
This vulnerability is rated as Moderate impact because exploitation requires local system access and relies on winning a race condition during network address lifecycle management. Under standard Red Hat Enterprise Linux installations, unprivileged users lack the administrative capabilities necessary to reconfigure network interfaces or trigger rapid address changes. Consequently, the practical risk is largely confined to a local denial of service through a kernel crash rather than arbitrary privilege escalation.
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 | N/A | 7.8 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | High | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/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
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