CVE-2026-72049 (GCVE-0-2026-72049)
Vulnerability from cvelistv5
Published
2026-08-15 05:52
Modified
2026-10-19 21:19
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
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).
References
Impacted products
Vendor Product Version
Linux Linux Version: 3e9c156e2c210ab67b12b1b692983a6b97c19d3f
Version: 3e9c156e2c210ab67b12b1b692983a6b97c19d3f
Version: 3e9c156e2c210ab67b12b1b692983a6b97c19d3f
Version: 3e9c156e2c210ab67b12b1b692983a6b97c19d3f
Version: 3e9c156e2c210ab67b12b1b692983a6b97c19d3f
Version: 3e9c156e2c210ab67b12b1b692983a6b97c19d3f
Version: 3e9c156e2c210ab67b12b1b692983a6b97c19d3f
Version: 3e9c156e2c210ab67b12b1b692983a6b97c19d3f
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nieee802154: admin-gate legacy LLSEC dump operations\n\nIn net/ieee802154/netlink.c, the legacy IEEE802154_NL family ops table\nbuilds the LLSEC dump entries (LLSEC_LIST_KEY, LLSEC_LIST_DEV,\nLLSEC_LIST_DEVKEY, LLSEC_LIST_SECLEVEL) with IEEE802154_DUMP() which\nsets no .flags, so generic netlink runs them ungated. The modern\nnl802154 family admin-gates the equivalent reads via\nNL802154_CMD_GET_SEC_KEY and friends with .flags = GENL_ADMIN_PERM.\n\nAny local uid that can open AF_NETLINK / NETLINK_GENERIC can resolve\nthe \"802.15.4 MAC\" family and dump LLSEC_LIST_KEY on any wpan netdev\nthat has an LLSEC key installed; the dump handler writes the raw\n16-byte AES-128 key bytes (IEEE802154_ATTR_LLSEC_KEY_BYTES, copied\nverbatim from struct ieee802154_llsec_key.key) into the reply.\nRecovering the AES key compromises 802.15.4 LLSEC link confidentiality\nand authenticity, since LLSEC uses CCM* and the same key authenticates\nand encrypts frames.\n\nImpact: any local uid with no capabilities can read the raw 16-byte\nAES-128 LLSEC key from the kernel keytable on any wpan netdev that has\nan administrator-installed LLSEC key, by issuing an LLSEC_LIST_KEY\ndump on the legacy IEEE802154_NL generic-netlink family.\n\nIntroduce IEEE802154_DUMP_PRIV() mirroring IEEE802154_DUMP() but\nsetting .flags = GENL_ADMIN_PERM, and use it for the four LLSEC dump\nentries. LIST_PHY and LIST_IFACE retain IEEE802154_DUMP() because the\nmodern nl802154 family exposes their equivalents to unprivileged\nreaders by design (NL802154_CMD_GET_WPAN_PHY and\nNL802154_CMD_GET_INTERFACE carry \"can be retrieved by unprivileged\nusers\" annotations)."
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              "value": "AV:L - Exploitation requires a local syscall path: open AF_NETLINK/NETLINK_GENERIC, resolve the \"802.15.4 MAC\" genl family, and send an NLM_F_DUMP for IEEE802154_LLSEC_LIST_KEY; the bug is in kernel netlink configuration code, not in remote 802.15.4 frame handling.\nAC:L - Once IEEE802154/LLSEC is enabled and keys are installed on a wpan netdev (typical on Zigbee/6LoWPAN gateways and industrial IoT coordinators), an attacker can deterministically trigger the dump and receive key material without races or special memory layout.\nPR:L - The vulnerable dump ops lack GENL_ADMIN_PERM, so netlink_capable(CAP_NET_ADMIN) is never enforced; any basic local UID with permission to create generic-netlink sockets (no capabilities) can read administrator-installed LLSEC keys.\nUI:N - No victim interaction is required beyond the attacker already having local execution access; exploitation is a direct netlink dump request with no user clicks, mounts, or device pairing steps.\nS:U - Impact stays within the host kernel/network stack security boundary (disclosure of kernel-held LLSEC credentials); it does not cross VM, container, or IOMMU isolation boundaries.\nC:H - The dump handler returns full raw 16-byte AES-128 LLSEC key bytes (IEEE802154_ATTR_LLSEC_KEY_BYTES) for every installed key, enabling decryption of all CCM*-protected 802.15.4 traffic protected by those keys.\nI:H - Disclosed AES-128 LLSEC keys are used for both encryption and authentication (CCM*); possession enables forging cryptographically valid LLSEC frames and impersonating trusted WPAN devices on Zigbee/6LoWPAN/industrial sensor networks.\nA:N - The bug is a read-only information disclosure via netlink attribute copying; it does not corrupt memory, panic the kernel, or cause hangs or denial of service."
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    "cveId": "CVE-2026-72049",
    "datePublished": "2026-08-15T05:52:06.989Z",
    "dateReserved": "2026-08-09T03:40:39.902Z",
    "dateUpdated": "2026-10-19T21:19:24.612Z",
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[{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-862\", \"description\": \"CWE-862 Missing Authorization\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T15:50:41.890Z\"}, \"title\": \"CISA ADP Vulnrichment\"}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-72049\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"Linux\", \"dateReserved\": \"2026-08-09T03:40:39.902Z\", \"datePublished\": \"2026-08-15T05:52:06.989Z\", \"dateUpdated\": \"2026-10-19T21:19:24.612Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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