net/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync()

{
  "id": "cd1fa8b3362c7cbcf020d7930e2b5435f52f6b53db2941239d2e7da689fb3e1f",
  "url": "https://osv.dev/vulnerability/CVE-2025-39857",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync() BUG: kernel NULL pointer dereference, address: 00000000000002ec PGD 0 P4D 0 Oops: Oops: 0000 [#1] SMP PTI CPU: 28 UID: 0 PID: 343 Comm: kworker/28:1 Kdump: loaded Tainted: G OE 6.17.0-rc2+ #9 NONE Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014 Workqueue: smc_hs_wq smc_listen_work [smc] RIP: 0010:smc_ib_is_sg_need_sync+0x9e/0xd0 [smc] ... Call Trace: smcr_buf_map_link+0x211/0x2a0 [smc] __smc_buf_create+0x522/0x970 [smc] smc_buf_create+0x3a/0x110 [smc] smc_find_rdma_v2_device_serv+0x18f/0x240 [smc] ? smc_vlan_by_tcpsk+0x7e/0xe0 [smc] smc_listen_find_device+0x1dd/0x2b0 [smc] smc_listen_work+0x30f/0x580 [smc] process_one_work+0x18c/0x340 worker_thread+0x242/0x360 kthread+0xe7/0x220 ret_from_fork+0x13a/0x160 ret_from_fork_asm+0x1a/0x30 If the software RoCE device is used, ibdev->dma_device is a null pointer. As a result, the problem occurs. Null pointer detection is added to prevent problems.",
    "evidence": "osv:CVE-2025-39857",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.151",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.105",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.46",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.16.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-39857",
      "aliases": [
        "CVE-2025-39857"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0ef69e788411cba2af017db731a9fc62d255e9ac"
                },
                {
                  "fixed": "0cdf1fd8fc59d44a48c694324611136910301ef9"
                },
                {
                  "fixed": "f18d9b3abf9c6587372cc702f963a7592277ed56"
                },
                {
                  "fixed": "eb929910bd4b4165920fa06a87b22cc6cae92e0e"
                },
                {
                  "fixed": "34f17cbe027050b8d5316ea1b6f9bd7c378e92de"
                },
                {
                  "fixed": "ba1e9421cf1a8369d25c3832439702a015d6b5f9"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39857.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.0.0"
                },
                {
                  "fixed": "6.1.151"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.105"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.46"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.16.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39857.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.949554356Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-032379.html",
        "https://git.kernel.org/stable/c/0cdf1fd8fc59d44a48c694324611136910301ef9",
        "https://git.kernel.org/stable/c/34f17cbe027050b8d5316ea1b6f9bd7c378e92de",
        "https://git.kernel.org/stable/c/ba1e9421cf1a8369d25c3832439702a015d6b5f9",
        "https://git.kernel.org/stable/c/eb929910bd4b4165920fa06a87b22cc6cae92e0e",
        "https://git.kernel.org/stable/c/f18d9b3abf9c6587372cc702f963a7592277ed56",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39857.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-39857",
        "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/2025/39xxx/CVE-2025-39857.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-39857",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 510996,
  "published_at": "2025-09-19T15:26:28.225+00:00"
}