vlan: enforce underlying device type (Linux Linux)

CVE-2025-21920
HIGH 7.1

En bref

Source
NVD
EPSS
EPSS 0.24 % · centile 14 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: vlan: enforce underlying device type Currently, VLAN devices can be created on top of non-ethernet devices. Besides the fact that it doesn't make much sense, this also causes a bug which leaks the address of a kernel function to usermode. When creating a VLAN device, we initialize GARP (garp_init_applicant) and MRP (mrp_init_applicant) for the underlying device. As part of the initialization process, we add the multicast address of each applicant to the underlying device, by calling dev_mc_add. __dev_mc_add uses dev->addr_len to determine the length of the new multicast address. This causes an out-of-bounds read if dev->addr_len is greater than 6, since the multicast addresses provided by GARP and MRP are only 6 bytes long. This behaviour can be reproduced using the following commands: ip tunnel add gretest mode ip6gre local ::1 remote ::2 dev lo ip l set up dev gretest ip link add link gretest name vlantest type vlan id 100 Then, the following command will display the address of garp_pdu_rcv: ip maddr show | grep 01:80:c2:00:00:21 Fix the bug by enforcing the type of the underlying device during VLAN device initialization.

Faiblesses (CWE)

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1HIGH 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:HCISA-ADP
CVSS 3.1HIGH 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:HNVD · nvd@nist.gov (Primary)
CVSS 3.1HIGH 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:HNVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected 22bedad3ce112d5ca1eaf043d4990fa2ed698c87 < 7f1564b2b2072b7aa1ac75350e9560a07c7a44fd ; affected 22bedad3ce112d5ca1eaf043d4990fa2ed698c87 < fa40ebef69234e39ec2d26930d045f2fb9a8cb2b ; affected 22bedad3ce112d5ca1eaf043d4990fa2ed698c87 < 0fb7aa04c19eac4417f360a9f7611a60637bdacc ; affected 22bedad3ce112d5ca1eaf043d4990fa2ed698c87 < 5a515d13e15536e82c5c7c83eb6cf5bc4827fee5 ; affected 22bedad3ce112d5ca1eaf043d4990fa2ed698c87 < 3561442599804905c3defca241787cd4546e99a7 ; affected 22bedad3ce112d5ca1eaf043d4990fa2ed698c87 < 30e8aee77899173a82ae5ed89f536c096f20aaeb
Linux · Linuxaffected 2.6.35 ; unaffected 0 < 2.6.35 ; unaffected 5.4.291 ≤ 5.4.* ; unaffected 5.10.235 ≤ 5.10.* ; unaffected 5.15.179 ≤ 5.15.* ; unaffected 6.1.131 ≤ 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