netfilter: socket: Lookup orig tuple for IPv6 SNAT (Linux Linux)

CVE-2025-22021
CRITICAL 10.0

En bref

Source
NVD
EPSS
EPSS 0.47 % · centile 41 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: socket: Lookup orig tuple for IPv6 SNAT nf_sk_lookup_slow_v4 does the conntrack lookup for IPv4 packets to restore the original 5-tuple in case of SNAT, to be able to find the right socket (if any). Then socket_match() can correctly check whether the socket was transparent. However, the IPv6 counterpart (nf_sk_lookup_slow_v6) lacks this conntrack lookup, making xt_socket fail to match on the socket when the packet was SNATed. Add the same logic to nf_sk_lookup_slow_v6. IPv6 SNAT is used in Kubernetes clusters for pod-to-world packets, as pods' addresses are in the fd00::/8 ULA subnet and need to be replaced with the node's external address. Cilium leverages Envoy to enforce L7 policies, and Envoy uses transparent sockets. Cilium inserts an iptables prerouting rule that matches on `-m socket --transparent` and redirects the packets to localhost, but it fails to match SNATed IPv6 packets due to that missing conntrack lookup.

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1CRITICAL 10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HLinux
CVSS 3.1CRITICAL 10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)
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 eb31628e37a0a4e01fffd79dcc7f815d2357f53a < 6488b96a79a26e19100ad872622f04e93b638d7f ; affected eb31628e37a0a4e01fffd79dcc7f815d2357f53a < 58ab63d3ded2ca6141357a2b24eee8453d0f871d ; affected eb31628e37a0a4e01fffd79dcc7f815d2357f53a < 1ca2169cc19dca893c7aae6af122852097435d16 ; affected eb31628e37a0a4e01fffd79dcc7f815d2357f53a < 1ec43100f7123010730b7ddfc3d5c2eac19e70e7 ; affected eb31628e37a0a4e01fffd79dcc7f815d2357f53a < 5251041573850e5020cd447374e23010be698898 ; affected eb31628e37a0a4e01fffd79dcc7f815d2357f53a < 2bb139e483f8cbe488d19d8c1135ac3615e2668c
Linux · Linuxaffected 3.13 ; unaffected 0 < 3.13 ; unaffected 5.4.292 ≤ 5.4.* ; unaffected 5.10.236 ≤ 5.10.* ; unaffected 5.15.180 ≤ 5.15.* ; unaffected 6.1.133 ≤ 6.1.*

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