netfilter: xt_multiport: validate range encoding in checkentry (Linux Linux)

CVE-2026-31681
MEDIUM 5.5

En bref

Source
NVD
EPSS
EPSS 0.12 % · centile 2 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

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.

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1MEDIUM 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HNVD · nvd@nist.gov (Primary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < 8c5bf8f5b478f569191c4a7982de7cd5f5f73c1a ; affected a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < c9749f6232c845e31c21d4cc72200211df15d8a2 ; affected a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < b67d638cbee9975c765feb45c126e96ed11ec802 ; affected a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < 36bf0d98e180a7c384c8d8a59b0d2d4b80e5eb16 ; affected a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < aec14808271f2bf2b656de6ff12dfe73c5fd3b67 ; affected a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < 8368ce8eb01f0b91111d814703696e780d0ef12f
Linux · Linuxaffected 2.6.17 ; unaffected 0 < 2.6.17 ; unaffected 5.10.258 ≤ 5.10.* ; unaffected 5.15.209 ≤ 5.15.* ; unaffected 6.1.175 ≤ 6.1.* ; unaffected 6.6.136 ≤ 6.6.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD