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CVE-2026-72049

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.1 · Élevée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, <3465035ba18b1ed50f8d201897d14135d20532b0, 0, <dffe745760f38fac0b8288e0dc4759b23d9888ff, <=7.1.*, <6383248058956f2a52d720b1e9f8921099cdae04, <e84708ef7521f3bffc85a449954042018abbd60e, <9c1e0b6d49471a712511d23fc9d06901561135e8, 6.1.178, <=5.10.*, <=6.6.*, 6.12.97, <1905ebabe638c946aced00c4bb664da26cac56d5, <=6.18.*, 5.15.212, <09fd25cd8cd80a6b3edef04e53a7324d06ac2180, <5abe94a205539d27945cda3ba43fdcfe295cf2c8, 5.10.261, 6.6.145, <=*, <=5.15.*, 3e9c156e2c210ab67b12b1b692983a6b97c19d3f, 3.16, <3.16, 7.2

Description

In the Linux kernel, the following vulnerability has been resolved: ieee802154: admin-gate legacy LLSEC dump operations In net/ieee802154/netlink.c, the legacy IEEE802154_NL family ops table builds the LLSEC dump entries (LLSEC_LIST_KEY, LLSEC_LIST_DEV, LLSEC_LIST_DEVKEY, LLSEC_LIST_SECLEVEL) with IEEE802154_DUMP() which sets no .flags, so generic netlink runs them ungated. The modern nl802154 family admin-gates the equivalent reads via NL802154_CMD_GET_SEC_KEY and friends with .flags = GENL_ADMIN_PERM. Any local uid that can open AF_NETLINK / NETLINK_GENERIC can resolve the "802.15.4 MAC" family and dump LLSEC_LIST_KEY on any wpan netdev that has an LLSEC key installed; the dump handler writes the raw 16-byte AES-128 key bytes (IEEE802154_ATTR_LLSEC_KEY_BYTES, copied verbatim from struct ieee802154_llsec_key.key) into the reply. Recovering the AES key compromises 802.15.4 LLSEC link confidentiality and authenticity, since LLSEC uses CCM* and the same key authenticates and encrypts frames. Impact: any local uid with no capabilities can read the raw 16-byte AES-128 LLSEC key from the kernel keytable on any wpan netdev that has an administrator-installed LLSEC key, by issuing an LLSEC_LIST_KEY dump on the legacy IEEE802154_NL generic-netlink family. Introduce IEEE802154_DUMP_PRIV() mirroring IEEE802154_DUMP() but setting .flags = GENL_ADMIN_PERM, and use it for the four LLSEC dump entries. LIST_PHY and LIST_IFACE retain IEEE802154_DUMP() because the modern nl802154 family exposes their equivalents to unprivileged readers by design (NL802154_CMD_GET_WPAN_PHY and NL802154_CMD_GET_INTERFACE carry "can be retrieved by unprivileged users" annotations).

Gravité et risque d'exploitation

CVE-2026-72049 obtient un score CVSS de 7.1/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.16 %, ce qui la place devant 4.8 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, <3465035ba18b1ed50f8d201897d14135d20532b0, 0, <dffe745760f38fac0b8288e0dc4759b23d9888ff, <=7.1.*, <6383248058956f2a52d720b1e9f8921099cdae04, <e84708ef7521f3bffc85a449954042018abbd60e, <9c1e0b6d49471a712511d23fc9d06901561135e8, 6.1.178, <=5.10.*, <=6.6.*, 6.12.97, <1905ebabe638c946aced00c4bb664da26cac56d5, <=6.18.*, 5.15.212, <09fd25cd8cd80a6b3edef04e53a7324d06ac2180, <5abe94a205539d27945cda3ba43fdcfe295cf2c8, 5.10.261, 6.6.145, <=*, <=5.15.*, 3e9c156e2c210ab67b12b1b692983a6b97c19d3f, 3.16, <3.16, 7.2) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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