neighbour: Enforce min/max to NDTPA_INTERVAL_PROBE_TIME_MS.

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98317
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 09:18:23 UTC
Updated2026-10-19 10:18:33 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001840000 probability, percentile 0.072570000 (date 2026-10-06)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 211da42eaa45db7b0edfde187dd88a85fbd466b5 982c7f66c04134b77126edbfd8a63ecd6928cfd9 git Not specified
CNA Linux Linux affected 211da42eaa45db7b0edfde187dd88a85fbd466b5 8550b50e49b01b572e653e572f24ddd73949aa74 git Not specified
CNA Linux Linux affected 211da42eaa45db7b0edfde187dd88a85fbd466b5 6d79b223ec44ada58ad37db42f539b60985a7722 git Not specified
CNA Linux Linux affected 6.0 Not specified
CNA Linux Linux unaffected 6.0 semver Not specified
CNA Linux Linux unaffected 6.18.54 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.8 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8550b50e49b01b572e653e572f24ddd73949aa74 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6d79b223ec44ada58ad37db42f539b60985a7722 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/982c7f66c04134b77126edbfd8a63ecd6928cfd9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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