Improper Validation of Specified Quantity in Input Affecting kernel6.18-debuginfo package, versions <1:6.18.54-121.166.amzn2023
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Test your applications- Snyk IDSNYK-AMZN2023-KERNEL618DEBUGINFO-21417775
- published22 Oct 2026
- disclosed6 Oct 2026
Introduced: 6 Oct 2026
NewCVE-2026-98317 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2023 kernel6.18-debuginfo to version 1:6.18.54-121.166.amzn2023 or higher.
This issue was patched in ALAS2023-2026-3192.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel6.18-debuginfo package and not the kernel6.18-debuginfo package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.
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.