{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-63831",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-63831"
  ],
  "published": "2026-07-19T12:02:32Z",
  "summary": "mac802154: llsec: add skb_cow_data() before in-place crypto",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmac802154: llsec: add skb_cow_data() before in-place crypto\n\nllsec_do_encrypt_unauth(), llsec_do_encrypt_auth(),\nllsec_do_decrypt_unauth(), and llsec_do_decrypt_auth() all perform\nin-place cryptographic transformations on skb data.  They build a\nscatterlist with sg_init_one() pointing into the skb's linear data area\nand then pass the same scatterlist as both src and dst to the crypto API\n(e.g. crypto_skcipher_encrypt/decrypt, crypto_aead_encrypt/decrypt).\n\nOn the RX path, __ieee802154_rx_handle_packet() clones the received skb\nbefore handing it to each subscriber via ieee802154_subif_frame().  The\ncloned skb shares the same underlying data buffer via reference\ncounting.  When llsec_do_decrypt() subsequently modifies this shared\nbuffer in place, it corrupts data that other clones -- potentially\nbelonging to other sockets or subsystems -- still reference.\n\nOn the TX path, similar data sharing can occur when an skb's head has\nbeen cloned (skb_cloned() returns true).\n\nThe fix is to call skb_cow_data() before performing any in-place crypto\noperation.  skb_cow_data() ensures that the skb's data area is not\nshared: if the skb head is cloned or the data spans multiple fragments,\nit copies the data into a private buffer that can be safely modified in\nplace.  This is the same pattern used by:\n\n  - ESP (net/ipv4/esp4.c, net/ipv6/esp6.c)\n  - MACsec (drivers/net/macsec.c)\n  - WireGuard (drivers/net/wireguard/receive.c)\n  - TIPC (net/tipc/crypto.c)\n\nWithout this guard, in-place crypto on shared skb data leads to:\n  - Silent data corruption of other skb clones\n  - Use-after-free when the crypto API scatterwalk writes through a\n    page that has already been freed by another clone's kfree_skb()\n  - Kernel crashes under concurrent 802.15.4 traffic with security\n    enabled (KASAN/KMSAN reports slab-use-after-free)\n\nFound by 0sec (https://0sec.ai) using automated source analysis.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7a831bcd0486788283ef35e396d4282ee01bb0d5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ff976ef7c39199ebff33c18034636595016db9f0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e28e7fd34c449028325322a3f5127b92594b7396"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/993fd674fe85d114e6a8d3963033d4fbbc2170a8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bd968bdd568beacfdf98ec537a87527e85f1d0cf"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/86d531337ea1ba02d9f2bc830d07c683d9bfaade"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/84a04eb5b210643bd67aab81ff805d32f62aa865"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - The bug is reached when the kernel processes incoming IEEE 802.15.4 frames from a radio driver (ieee802154_rx \u2192 llsec_do_decrypt), which requires an attacker within WPAN radio range, analogous to Bluetooth/WiFi adjacent-segment attacks.\nAC:L - An attacker can reliably trigger the flaw by transmitting valid LLSEC-protected 802.15.4 frames (including broadcast frames fanning out to multiple virtual interfaces) and controlling traffic timing; the skb_clone sharing is deterministic on the RX path.\nPR:N - Exploitation requires no local privileges on the victim\u2014only the ability to send 802.15.4 radio frames as a PAN participant with valid LLSEC credentials, which is a network-position requirement rather than elevated kernel access.\nUI:N - No end-user action is needed at exploitation time; triggering the bug only requires the target to already be running mac802154 with LLSEC enabled and receiving attacker-crafted wireless frames.\nS:U - Impact is confined to kernel memory/subsystems on the affected host (UAF, data corruption, crash); it does not inherently cross a VM, container, or IOMMU security boundary.\nC:H - The commit and fix description confirm slab use-after-free from in-place crypto scatterwalk writes through skb data pages freed by sibling clones, enabling arbitrary kernel memory reads.\nI:H - Writing through freed/shared skb pages during in-place decrypt/encrypt corrupts kernel heap contents and provides a standard exploitable memory-corruption primitive for arbitrary modification or code execution.\nA:H - Concurrent LLSEC-enabled 802.15.4 traffic can cause kernel oops/panic, and KASAN/KMSAN reports confirm slab-use-after-free crashes under the vulnerable code path."
    }
  }
}