net: bcmgenet: fix NULL dereference in set_coalesce before first open

{
  "id": "555a42dc4108f2afab6f66ab295e05fe2039661c1d031de4ecc7f049c54f81e8",
  "url": "https://osv.dev/vulnerability/CVE-2026-98798",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: bcmgenet: fix NULL dereference in set_coalesce before first open",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: bcmgenet: fix NULL dereference in set_coalesce before first open The Rx ring priv and index are only set in bcmgenet_init_rx_ring(), which runs at open. Setting the Rx coalescing parameters on an interface that was never opened, e.g. \"ethtool -C eth0 rx-usecs 50\", dereferences a NULL ring->priv. The oops happens with RTNL held, so networking stays stuck until a reboot: Unable to handle kernel paging request at virtual address 0000000000002788 pc : bcmgenet_set_rx_coalesce.isra.0+0x10/0x88 lr : bcmgenet_set_coalesce+0xe8/0x180 Call trace: bcmgenet_set_rx_coalesce.isra.0+0x10/0x88 (P) __ethnl_set_coalesce.isra.0+0x490/0x570 ethnl_set_coalesce+0x48/0xc0 ethnl_default_set_doit+0xf4/0x230 genl_family_rcv_msg_doit+0xe8/0x160 genl_rcv_msg+0x220/0x2a0 netlink_rcv_skb+0x68/0x140 genl_rcv+0x40/0x60 netlink_unicast+0x338/0x3c0 netlink_sendmsg+0x19c/0x3f8 __sock_sendmsg+0x64/0xc0 __sys_sendto+0x124/0x198 __arm64_sys_sendto+0x30/0x48 Set priv and index at probe. Writing the registers while the interface is down is harmless because open resets the MAC and bcmgenet_init_rx_coalesce() reapplies the stored values. It was observed on a Raspberry Pi CM4, but should apply to all other genet devices.",
    "evidence": "osv:CVE-2026-98798",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "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": "6.18.56",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98798",
      "aliases": [
        "CVE-2026-98798"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9f4ca05827a27ec73bf63a42732f1978b8a779af"
                },
                {
                  "fixed": "51e76b4113e5147329ed8dd232375bf11fd34044"
                },
                {
                  "fixed": "213ff02ab26a4543ef02b4db393bbdd5fa5679a7"
                },
                {
                  "fixed": "0d867b91598b6ed2f75998c34f4e2869631da31e"
                },
                {
                  "fixed": "2294b62eaec6fd3c76a261d287f66641eeafd5f0"
                },
                {
                  "fixed": "d870102b5425390cab42eebbf3d19ec6a43c6734"
                },
                {
                  "fixed": "19419faf58dfe5bcc8a9e60e622976c5f8e3ddc1"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98798.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.17.0"
                },
                {
                  "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": "6.18.56"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98798.json"
          }
        }
      ],
      "modified": "2026-11-01T02:31:08.049943678Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0d867b91598b6ed2f75998c34f4e2869631da31e",
        "https://git.kernel.org/stable/c/19419faf58dfe5bcc8a9e60e622976c5f8e3ddc1",
        "https://git.kernel.org/stable/c/213ff02ab26a4543ef02b4db393bbdd5fa5679a7",
        "https://git.kernel.org/stable/c/2294b62eaec6fd3c76a261d287f66641eeafd5f0",
        "https://git.kernel.org/stable/c/51e76b4113e5147329ed8dd232375bf11fd34044",
        "https://git.kernel.org/stable/c/d870102b5425390cab42eebbf3d19ec6a43c6734",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98798.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98798",
        "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/2026/98xxx/CVE-2026-98798.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98798",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 490697,
  "published_at": "2026-10-18T15:48:43.367+00:00"
}