netfilter: nf_tables: fix use-after-free in nf_tables_addchain() (Linux Linux)

CVE-2026-23231
HIGH 7.8

En bref

Source
NVD
EPSS
EPSS 1.04 % · centile 64 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix use-after-free in nf_tables_addchain() nf_tables_addchain() publishes the chain to table->chains via list_add_tail_rcu() (in nft_chain_add()) before registering hooks. If nf_tables_register_hook() then fails, the error path calls nft_chain_del() (list_del_rcu()) followed by nf_tables_chain_destroy() with no RCU grace period in between. This creates two use-after-free conditions: 1) Control-plane: nf_tables_dump_chains() traverses table->chains under rcu_read_lock(). A concurrent dump can still be walking the chain when the error path frees it. 2) Packet path: for NFPROTO_INET, nf_register_net_hook() briefly installs the IPv4 hook before IPv6 registration fails. Packets entering nft_do_chain() via the transient IPv4 hook can still be dereferencing chain->blob_gen_X when the error path frees the chain. Add synchronize_rcu() between nft_chain_del() and the chain destroy so that all RCU readers -- both dump threads and in-flight packet evaluation -- have finished before the chain is freed.

Faiblesses (CWE)

  • CWE-416 — Utilisation après libération

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · nvd@nist.gov (Primary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected 91c7b38dc9f0de4f7f444b796d14476bc12df7bc < 2a6586ecfa4ce1413daaafee250d2590e05f1a33 ; affected 91c7b38dc9f0de4f7f444b796d14476bc12df7bc < 7017745068a9068904e1e7a1b170a5785647cc81 ; affected 91c7b38dc9f0de4f7f444b796d14476bc12df7bc < f3fe58ce37926a10115ede527d59b91bcc05400a ; affected 91c7b38dc9f0de4f7f444b796d14476bc12df7bc < dbd0af8083dd201f07c49110b2ee93710abdff28 ; affected 91c7b38dc9f0de4f7f444b796d14476bc12df7bc < 2f9a4ffeb763aec822f8ff3d1e82202d27d46d4b ; affected 91c7b38dc9f0de4f7f444b796d14476bc12df7bc < 71e99ee20fc3f662555118cf1159443250647533
Linux · Linuxaffected 3.16 ; unaffected 0 < 3.16 ; unaffected 6.1.165 ≤ 6.1.* ; unaffected 6.6.128 ≤ 6.6.* ; unaffected 6.12.75 ≤ 6.12.* ; unaffected 6.18.14 ≤ 6.18.*

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