FKIE_CVE-2026-98317

Vulnerability from fkie_nvd - Published: 2026-10-06 09:18 - Updated: 2026-10-06 09:18
Severity
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: # 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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6d79b223ec44ada58ad37db42f539b60985a7722
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8550b50e49b01b572e653e572f24ddd73949aa74
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/982c7f66c04134b77126edbfd8a63ecd6928cfd9
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "Documentation/netlink/specs/rt-neigh.yaml",
            "Documentation/networking/ip-sysctl.rst",
            "net/core/neighbour.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "982c7f66c04134b77126edbfd8a63ecd6928cfd9",
              "status": "affected",
              "version": "211da42eaa45db7b0edfde187dd88a85fbd466b5",
              "versionType": "git"
            },
            {
              "lessThan": "8550b50e49b01b572e653e572f24ddd73949aa74",
              "status": "affected",
              "version": "211da42eaa45db7b0edfde187dd88a85fbd466b5",
              "versionType": "git"
            },
            {
              "lessThan": "6d79b223ec44ada58ad37db42f539b60985a7722",
              "status": "affected",
              "version": "211da42eaa45db7b0edfde187dd88a85fbd466b5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "Documentation/netlink/specs/rt-neigh.yaml",
            "Documentation/networking/ip-sysctl.rst",
            "net/core/neighbour.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
            },
            {
              "lessThan": "6.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nneighbour: Enforce min/max to NDTPA_INTERVAL_PROBE_TIME_MS.\n\nNDTPA_INTERVAL_PROBE_TIME_MS sets .type and .min but misses\n.validation_type, so no validation is applied:\n\n  # ynl --family rt-neigh --do setneightbl \\\n  --json \u0027{\"name\": \"arp_cache\", \"parms\": {\"interval-probe-time-ms\": 0}}\u0027\n\n  # ynl --family rt-neigh --dump getneightbl --output-json | \\\n  jq \u0027.[] | select(.name == \"arp_cache\" and has(\"config\"))\n          | .parms[\"interval-probe-time-ms\"]\u0027\n  0\n\nMoreover, nla_get_msecs() uses msecs_to_jiffies(), and u64 is\nsilently cast to u32, so a larger value can bypass the min check:\n\n  e.g. 4294967296 == 0x100000000\n\n  # ynl --family rt-neigh --do setneightbl \\\n  --json \u0027{\"name\": \"arp_cache\", \"parms\": {\"interval-probe-time-ms\": 4294967296}}\u0027\n\n  # ynl --family rt-neigh --dump getneightbl --output-json | \\\n  jq \u0027.[] | select(.name == \"arp_cache\" and has(\"config\"))\n          | .parms[\"interval-probe-time-ms\"]\u0027\n  0\n\nmsecs_to_jiffies() returns MAX_JIFFY_OFFSET if the value is\nlarger than INT_MAX.  Also, INT_MAX ms overflows int NEIGH_VAR()\nwhen HZ \u003e 1000 (Alpha, MIPS), and passing a negative integer to\nqueue_delayed_work(unsigned long delay) causes sign extension,\nwhich wraps around the expiry time to the past, resulting in it\nbeing handled as 0 delay in the timer wheel.\n\nLet\u0027s use NLA_POLICY_FULL_RANGE() and limit the max to 1 day.\n\nThe same max check is applied to sysctl as well.\n\nNote that this controls the probe interval for NTF_MANAGED\nentries, so the max of 1 day is unlikely to break any\ndeployments."
    }
  ],
  "id": "CVE-2026-98317",
  "lastModified": "2026-10-06T09:18:23.530",
  "metrics": {},
  "published": "2026-10-06T09:18:23.530",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6d79b223ec44ada58ad37db42f539b60985a7722"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8550b50e49b01b572e653e572f24ddd73949aa74"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/982c7f66c04134b77126edbfd8a63ecd6928cfd9"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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