af_unix: Get user_ns from in_skb in unix_diag_get_exact().

{
  "id": "82f17921dd05e343207c16b278f3b11f5b0736a957137ac093058418e675ea72",
  "url": "https://osv.dev/vulnerability/CVE-2022-48970",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "af_unix: Get user_ns from in_skb in unix_diag_get_exact().",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: af_unix: Get user_ns from in_skb in unix_diag_get_exact(). Wei Chen reported a NULL deref in sk_user_ns() [0][1], and Paolo diagnosed the root cause: in unix_diag_get_exact(), the newly allocated skb does not have sk. [2] We must get the user_ns from the NETLINK_CB(in_skb).sk and pass it to sk_diag_fill(). [0]: BUG: kernel NULL pointer dereference, address: 0000000000000270 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 12bbce067 P4D 12bbce067 PUD 12bc40067 PMD 0 Oops: 0000 [#1] PREEMPT SMP CPU: 0 PID: 27942 Comm: syz-executor.0 Not tainted 6.1.0-rc5-next-20221118 #2 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-48-gd9c812dda519-prebuilt.qemu.org 04/01/2014 RIP: 0010:sk_user_ns include/net/sock.h:920 [inline] RIP: 0010:sk_diag_dump_uid net/unix/diag.c:119 [inline] RIP: 0010:sk_diag_fill+0x77d/0x890 net/unix/diag.c:170 Code: 89 ef e8 66 d4 2d fd c7 44 24 40 00 00 00 00 49 8d 7c 24 18 e8 54 d7 2d fd 49 8b 5c 24 18 48 8d bb 70 02 00 00 e8 43 d7 2d fd <48> 8b 9b 70 02 00 00 48 8d 7b 10 e8 33 d7 2d fd 48 8b 5b 10 48 8d RSP: 0018:ffffc90000d67968 EFLAGS: 00010246 RAX: ffff88812badaa48 RBX: 0000000000000000 RCX: ffffffff840d481d RDX: 0000000000000465 RSI: 0000000000000000 RDI: 0000000000000270 RBP: ffffc90000d679a8 R08: 0000000000000277 R09: 0000000000000000 R10: 0001ffffffffffff R11: 0001c90000d679a8 R12: ffff88812ac03800 R13: ffff88812c87c400 R14:",
    "evidence": "osv:CVE-2022-48970",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.4.227",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.159",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.83",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.0.13",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2022-48970",
      "aliases": [
        "CVE-2022-48970"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "cae9910e73446cac68a54e3a7b02aaa12b689026"
                },
                {
                  "fixed": "c66d78aee55dab72c92020ebfbebc464d4f5dd2a"
                },
                {
                  "fixed": "575a6266f63dbb3b8eb1da03671451f0d81b8034"
                },
                {
                  "fixed": "5c014eb0ed6c8c57f483e94cc6e90f34ce426d91"
                },
                {
                  "fixed": "9c1d6f79a2c7b8221dcec27defc6dc461052ead4"
                },
                {
                  "fixed": "b3abe42e94900bdd045c472f9c9be620ba5ce553"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-48970.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.3.0"
                },
                {
                  "fixed": "5.4.227"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.5.0"
                },
                {
                  "fixed": "5.10.159"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.83"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.0.13"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-48970.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.336948571Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/575a6266f63dbb3b8eb1da03671451f0d81b8034",
        "https://git.kernel.org/stable/c/5c014eb0ed6c8c57f483e94cc6e90f34ce426d91",
        "https://git.kernel.org/stable/c/9c1d6f79a2c7b8221dcec27defc6dc461052ead4",
        "https://git.kernel.org/stable/c/b3abe42e94900bdd045c472f9c9be620ba5ce553",
        "https://git.kernel.org/stable/c/c66d78aee55dab72c92020ebfbebc464d4f5dd2a",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48970.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-48970",
        "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/2022/48xxx/CVE-2022-48970.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-48970",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 497880,
  "published_at": "2024-10-21T20:05:51.703+00:00"
}