net: sched: act_csum: validate nested VLAN headers (Linux Linux)

CVE-2026-31684
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: net: sched: act_csum: validate nested VLAN headers tcf_csum_act() walks nested VLAN headers directly from skb->data when an skb still carries in-payload VLAN tags. The current code reads vlan->h_vlan_encapsulated_proto and then pulls VLAN_HLEN bytes without first ensuring that the full VLAN header is present in the linear area. If only part of an inner VLAN header is linearized, accessing h_vlan_encapsulated_proto reads past the linear area, and the following skb_pull(VLAN_HLEN) may violate skb invariants. Fix this by requiring pskb_may_pull(skb, VLAN_HLEN) before accessing and pulling each nested VLAN header. If the header still is not fully available, drop the packet through the existing error path.

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 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 < 0410c619e86551677fb79887a38eccad3f5a0725 ; affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 < 886469b6455611a511aa6013e957e15e50577513 ; affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 < 46c07ad50fa2f4ba7663ee1b72b75ad7ad45cf09 ; affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 < eb3765b90eb8f2a3d6310a80c14a9e57ec4267a2 ; affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 < a69738efea0996d05a3c7d2178551b891744df1b ; affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 < ec4930979b3f7bbeb7af5744599fc6603a4dba62
Linux · Linuxaffected 5.1 ; unaffected 0 < 5.1 ; 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