CVE-2026-72049

Status: UPDATED  |  Advisory ID: CVE-2026-72049

Key Details

Affected Products, Subsystems & Sectors

What to Know

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). (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References