CVE-2026-72049

Summary

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).

Affected Software

VendorProductVersion RangeStatus
LinuxLinux3e9c156e2c210ab67b12b1b692983a6b97c19d3f < 3465035ba18b1ed50f8d201897d14135d20532b0affected
LinuxLinux3e9c156e2c210ab67b12b1b692983a6b97c19d3f < dffe745760f38fac0b8288e0dc4759b23d9888ffaffected
LinuxLinux3e9c156e2c210ab67b12b1b692983a6b97c19d3f < e84708ef7521f3bffc85a449954042018abbd60eaffected
LinuxLinux3e9c156e2c210ab67b12b1b692983a6b97c19d3f < 5abe94a205539d27945cda3ba43fdcfe295cf2c8affected
LinuxLinux3e9c156e2c210ab67b12b1b692983a6b97c19d3f < 09fd25cd8cd80a6b3edef04e53a7324d06ac2180affected
LinuxLinux3e9c156e2c210ab67b12b1b692983a6b97c19d3f < 1905ebabe638c946aced00c4bb664da26cac56d5affected
LinuxLinux3e9c156e2c210ab67b12b1b692983a6b97c19d3f < 6383248058956f2a52d720b1e9f8921099cdae04affected
LinuxLinux3e9c156e2c210ab67b12b1b692983a6b97c19d3f < 9c1e0b6d49471a712511d23fc9d06901561135e8affected
LinuxLinux3.16affected
LinuxLinux0 < 3.16unaffected
LinuxLinux5.10.261 <= 5.10.*unaffected
LinuxLinux5.15.212 <= 5.15.*unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References