CVE-2022-50043

MEDIUM

MEDIUM Priority: 0.01 BB Relevance: 36/100

Published: 2025-06-18 Modified: 2026-11-05 First seen: 2026-11-05 Status: active

Attack Surface

Low Complexity No Interaction

CVSS Vector Breakdown

AV: Local

AC: Low

PR: Low

UI: None

S: Unchanged

C: None

I: None

A: High

Description

In the Linux kernel, the following vulnerability has been resolved: net: fix potential refcount leak in ndisc_router_discovery() The issue happens on specific paths in the function. After both the object `rt` and `neigh` are grabbed successfully, when `lifetime` is nonzero but the metric needs change, the function just deletes the route and set `rt` to NULL. Then, it may try grabbing `rt` and `neigh` again if above conditions hold. The function simply overwrite `neigh` if succeeds or returns if fails, without decreasing the reference count of previous `neigh`. This may result in memory leaks. Fix it by decrementing the reference count of `neigh` in place.

Affected Software (6)

Vendor	Product	Version
Linux	Linux	6b2e04bc240fe9be9e690059f710e9f95346d34d < ffb15594433391fd7885eb88ce5a7f7bdeefbb15
Linux	Linux	6b2e04bc240fe9be9e690059f710e9f95346d34d < 7998043d31d000c3a93f46182e6569dd0eecda34
Linux	Linux	6b2e04bc240fe9be9e690059f710e9f95346d34d < 7396ba87f1edf549284869451665c7c4e74ecd4f
Linux	Linux	5.12
linux	linux_kernel	5.12 – 5.15.63
linux	linux_kernel	6.0