---
id: CVE-2026-98317
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  neighbour: Enforce min/max to NDTPA_INTERVAL_PROBE_TIME_MS.

  NDTPA_INTERVAL_PROBE_TIME_MS sets .type and .min but misses
  .validation_type, so no validation is applied:
  …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  neighbour: Enforce min/max to NDTPA_INTERVAL_PROBE_TIME_MS.

  NDTPA_INTERVAL_PROBE_TIME_MS sets .type and .min but misses
  .validation_type, so no validation is applied:
  …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 211da42eaa45db7b0edfde187dd88a85fbd466b5 <
    982c7f66c04134b77126edbfd8a63ecd6928cfd9
  - >-
    Linux >= 211da42eaa45db7b0edfde187dd88a85fbd466b5 <
    8550b50e49b01b572e653e572f24ddd73949aa74
  - >-
    Linux >= 211da42eaa45db7b0edfde187dd88a85fbd466b5 <
    6d79b223ec44ada58ad37db42f539b60985a7722
  - Linux 6.0
published: '2026-10-06'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T09:18:23.530'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98317'
references:
  - url: 'https://git.kernel.org/stable/c/6d79b223ec44ada58ad37db42f539b60985a7722'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8550b50e49b01b572e653e572f24ddd73949aa74'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/982c7f66c04134b77126edbfd8a63ecd6928cfd9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-06T08:50:17.409Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

neighbour: Enforce min/max to NDTPA_INTERVAL_PROBE_TIME_MS.

NDTPA_INTERVAL_PROBE_TIME_MS sets .type and .min but misses
.validation_type, so no validation is applied:

  # ynl --family rt-neigh --do setneightbl \
  --json '{"name": "arp_cache", "parms": {"interval-probe-time-ms": 0}}'

  # ynl --family rt-neigh --dump getneightbl --output-json | \
  jq '.[] | select(.name == "arp_cache" and has("config"))
          | .parms["interval-probe-time-ms"]'
  0

Moreover, nla_get_msecs() uses msecs_to_jiffies(), and u64 is
silently cast to u32, so a larger value can bypass the min check:

  e.g. 4294967296 == 0x100000000

  # ynl --family rt-neigh --do setneightbl \
  --json '{"name": "arp_cache", "parms": {"interval-probe-time-ms": 4294967296}}'

  # ynl --family rt-neigh --dump getneightbl --output-json | \
  jq '.[] | select(.name == "arp_cache" and has("config"))
          | .parms["interval-probe-time-ms"]'
  0

msecs_to_jiffies() returns MAX_JIFFY_OFFSET if the value is
larger than INT_MAX.  Also, INT_MAX ms overflows int NEIGH_VAR()
when HZ > 1000 (Alpha, MIPS), and passing a negative integer to
queue_delayed_work(unsigned long delay) causes sign extension,
which wraps around the expiry time to the past, resulting in it
being handled as 0 delay in the timer wheel.

Let's use NLA_POLICY_FULL_RANGE() and limit the max to 1 day.

The same max check is applied to sysctl as well.

Note that this controls the probe interval for NTF_MANAGED
entries, so the max of 1 day is unlikely to break any
deployments.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.