tipc: hold a reference to nodes found by link name

{
  "id": "d3b62978a114d246dcb91e04beb3064a7108b3e02630797a7bdcb58e9b51d165",
  "url": "https://osv.dev/vulnerability/CVE-2026-99053",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "tipc: hold a reference to nodes found by link name",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: tipc: hold a reference to nodes found by link name tipc_node_find_by_name() returns a node after dropping its RCU read lock without taking a reference. The LINK_SET, LINK_GET and LINK_RESET_STATS handlers then lock and access the node, racing with timer-driven cleanup of a down peer. Generic netlink serialization does not exclude the node timer. The following interleaving can leave a handler using a freed node: CPU 0: find the node under RCU and release the node read lock CPU 1: tipc_node_timeout() clears the links and unlinks the down node CPU 1: drop the list and timer references, queuing tipc_node_free() CPU 0: leave the RCU read-side critical section CPU 1: complete the grace period and free the node CPU 0: acquire the node lock through the stale pointer LINK_SET also uses the node's media address after releasing the node lock, when passing queued packets to tipc_bearer_xmit(). KASAN on v7.3-rc5 reported: BUG: KASAN: slab-use-after-free in _raw_read_lock_bh Write of size 4 at addr ffff88807e06f008 by task poc/92 Call Trace: _raw_read_lock_bh kernel/locking/spinlock.c:287 tipc_nl_node_set_link net/tipc/node.c:2475 genl_family_rcv_msg_doit net/netlink/genetlink.c:1114 genl_rcv_msg net/netlink/genetlink.c:1209 netlink_rcv_skb net/netlink/af_netlink.c:2575 Allocated by task 0: tipc_node_create net/tipc/node.c:539 tipc_node_check_dest net/tipc/node.c:1196 tipc_disc_rcv net/tipc/discover.c:252 Freed by task 92:",
    "evidence": "osv:CVE-2026-99053",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.273",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.224",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.191",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.160",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.113",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.57",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.11",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-99053",
      "aliases": [
        "CVE-2026-99053"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6a939f365bdb03a74b4617bdb4402fc08da088b9"
                },
                {
                  "fixed": "384edc67201f8561b7de952647b923f0524b1f36"
                },
                {
                  "fixed": "5b7e58e8be90f4e8530e7a60372d003dfa7fd666"
                },
                {
                  "fixed": "92f3b3368722631e933a4db0cf8bd578ed08cd9c"
                },
                {
                  "fixed": "b60259d4047fbb735476c729dcf9306a038b6110"
                },
                {
                  "fixed": "f17e70206a1e763fcca2578a8db3c4eed0f843a9"
                },
                {
                  "fixed": "1428c5f1d346a2e1ac9156713975a72246957009"
                },
                {
                  "fixed": "3c3b308ee6e25729a6cf09b69cdd0e093220d40b"
                },
                {
                  "fixed": "17e73bae400f6a434dc006e3bee92c94cf781954"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-99053.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.19.0"
                },
                {
                  "fixed": "5.10.273"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.224"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.191"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.160"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.113"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.57"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.11"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-99053.json"
          }
        }
      ],
      "modified": "2026-11-01T02:31:07.212128709Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1428c5f1d346a2e1ac9156713975a72246957009",
        "https://git.kernel.org/stable/c/17e73bae400f6a434dc006e3bee92c94cf781954",
        "https://git.kernel.org/stable/c/384edc67201f8561b7de952647b923f0524b1f36",
        "https://git.kernel.org/stable/c/3c3b308ee6e25729a6cf09b69cdd0e093220d40b",
        "https://git.kernel.org/stable/c/5b7e58e8be90f4e8530e7a60372d003dfa7fd666",
        "https://git.kernel.org/stable/c/92f3b3368722631e933a4db0cf8bd578ed08cd9c",
        "https://git.kernel.org/stable/c/b60259d4047fbb735476c729dcf9306a038b6110",
        "https://git.kernel.org/stable/c/f17e70206a1e763fcca2578a8db3c4eed0f843a9",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99053.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-99053",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99053.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-99053",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 487316,
  "published_at": "2026-10-23T12:22:35.462+00:00"
}