Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV L L L N U N N H 5.5 .0017 5.8 —
AFFECTED Product Versions Fixed Linux a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 – — Linux 2.6.17 – 5.10.258
TIMELINE Mar 9 Reserved by Linux Apr 25 Published (CNA: Linux) Sep 8 ENRICHED — CVE-2026-31681 (Linux). Received CVSS 5.5 and CPE data from NVD.
In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_multiport: validate range encoding in checkentry ports_match_v1() treats any non-zero pflags entry as the start of a port range and unconditionally consumes the next ports[] element as the range end. The checkentry path currently validates protocol, flags and count, but it does not validate the range encoding itself. As a result, malformed rules can mark the last slot as a range start or place two range starts back to back, leaving ports_match_v1() to step past the last valid ports[] element while interpreting the rule. Reject malformed multiport v1 rules in checkentry by validating that each range start has a following element and that the following element is not itself marked as another range start.
| Date | Event | Detail |
|---|---|---|
| March 9, 2026 | Reserved | Reserved by Linux |
| April 25, 2026 | Published | Published (CNA: Linux) |
| September 8, 2026 | ENRICHED | ENRICHED — CVE-2026-31681 (Linux). Received CVSS 5.5 and CPE data from NVD. |
Authoritative record: CVE-2026-31681 at cve.org
Vendors: linux
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-31681 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
