riscv: vdso: fix NULL deference in vdso_join_timens() when vfork

{
  "id": "2a07822a768ac10551039948e3cc259f2fe7a94053adc18eb868f46b3fef48f8",
  "url": "https://osv.dev/vulnerability/CVE-2022-50674",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "riscv: vdso: fix NULL deference in vdso_join_timens() when vfork",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: riscv: vdso: fix NULL deference in vdso_join_timens() when vfork Testing tools/testing/selftests/timens/vfork_exec.c got below kernel log: [ 6.838454] Unable to handle kernel access to user memory without uaccess routines at virtual address 0000000000000020 [ 6.842255] Oops [#1] [ 6.842871] Modules linked in: [ 6.844249] CPU: 1 PID: 64 Comm: vfork_exec Not tainted 6.0.0-rc3-rt15+ #8 [ 6.845861] Hardware name: riscv-virtio,qemu (DT) [ 6.848009] epc : vdso_join_timens+0xd2/0x110 [ 6.850097] ra : vdso_join_timens+0xd2/0x110 [ 6.851164] epc : ffffffff8000635c ra : ffffffff8000635c sp : ff6000000181fbf0 [ 6.852562] gp : ffffffff80cff648 tp : ff60000000fdb700 t0 : 3030303030303030 [ 6.853852] t1 : 0000000000000030 t2 : 3030303030303030 s0 : ff6000000181fc40 [ 6.854984] s1 : ff60000001e6c000 a0 : 0000000000000010 a1 : ffffffff8005654c [ 6.856221] a2 : 00000000ffffefff a3 : 0000000000000000 a4 : 0000000000000000 [ 6.858114] a5 : 0000000000000000 a6 : 0000000000000008 a7 : 0000000000000038 [ 6.859484] s2 : ff60000001e6c068 s3 : ff6000000108abb0 s4 : 0000000000000000 [ 6.860751] s5 : 0000000000001000 s6 : ffffffff8089dc40 s7 : ffffffff8089dc38 [ 6.862029] s8 : ffffffff8089dc30 s9 : ff60000000fdbe38 s10: 000000000000005e [ 6.863304] s11: ffffffff80cc3510 t3 : ffffffff80d1112f t4 : ffffffff80d1112f [ 6.864565] t5 : ffffffff80d11130 t6 : ff6000000181fa00 [ 6.865561] status: 0000000000000120 badaddr: 0000000000000020 cause",
    "evidence": "osv:CVE-2022-50674",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.19.17",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.0.3",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2022-50674",
      "aliases": [
        "CVE-2022-50674"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "3092eb45637573c5e435fbf5eaf9516316e5f9c6"
                },
                {
                  "fixed": "df30c4feba51beeb138f3518c2421abc8cbda3c1"
                },
                {
                  "fixed": "f2419a6fbb4caf8cf3fe0ac7e4cf2e28127d04b4"
                },
                {
                  "fixed": "a8616d2dc193b6becc36b5f3cfeaa9ac7a5762f9"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50674.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.19.0"
                },
                {
                  "fixed": "5.19.17"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.20.0"
                },
                {
                  "fixed": "6.0.3"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50674.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.145130047Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/a8616d2dc193b6becc36b5f3cfeaa9ac7a5762f9",
        "https://git.kernel.org/stable/c/df30c4feba51beeb138f3518c2421abc8cbda3c1",
        "https://git.kernel.org/stable/c/f2419a6fbb4caf8cf3fe0ac7e4cf2e28127d04b4",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50674.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-50674",
        "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/2022/50xxx/CVE-2022-50674.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-50674",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 513358,
  "published_at": "2025-12-09T01:29:26.6+00:00"
}