{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "3092eb45637573c5e435fbf5eaf9516316e5f9c6"
            },
            {
              "fixed": "df30c4feba51beeb138f3518c2421abc8cbda3c1"
            },
            {
              "fixed": "f2419a6fbb4caf8cf3fe0ac7e4cf2e28127d04b4"
            },
            {
              "fixed": "a8616d2dc193b6becc36b5f3cfeaa9ac7a5762f9"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.19.0"
            },
            {
              "fixed": "5.19.17"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.20.0"
            },
            {
              "fixed": "6.0.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50674.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: vdso: fix NULL deference in vdso_join_timens() when vfork\n\nTesting tools/testing/selftests/timens/vfork_exec.c got below\nkernel log:\n\n[    6.838454] Unable to handle kernel access to user memory without uaccess routines at virtual address 0000000000000020\n[    6.842255] Oops [#1]\n[    6.842871] Modules linked in:\n[    6.844249] CPU: 1 PID: 64 Comm: vfork_exec Not tainted 6.0.0-rc3-rt15+ #8\n[    6.845861] Hardware name: riscv-virtio,qemu (DT)\n[    6.848009] epc : vdso_join_timens+0xd2/0x110\n[    6.850097]  ra : vdso_join_timens+0xd2/0x110\n[    6.851164] epc : ffffffff8000635c ra : ffffffff8000635c sp : ff6000000181fbf0\n[    6.852562]  gp : ffffffff80cff648 tp : ff60000000fdb700 t0 : 3030303030303030\n[    6.853852]  t1 : 0000000000000030 t2 : 3030303030303030 s0 : ff6000000181fc40\n[    6.854984]  s1 : ff60000001e6c000 a0 : 0000000000000010 a1 : ffffffff8005654c\n[    6.856221]  a2 : 00000000ffffefff a3 : 0000000000000000 a4 : 0000000000000000\n[    6.858114]  a5 : 0000000000000000 a6 : 0000000000000008 a7 : 0000000000000038\n[    6.859484]  s2 : ff60000001e6c068 s3 : ff6000000108abb0 s4 : 0000000000000000\n[    6.860751]  s5 : 0000000000001000 s6 : ffffffff8089dc40 s7 : ffffffff8089dc38\n[    6.862029]  s8 : ffffffff8089dc30 s9 : ff60000000fdbe38 s10: 000000000000005e\n[    6.863304]  s11: ffffffff80cc3510 t3 : ffffffff80d1112f t4 : ffffffff80d1112f\n[    6.864565]  t5 : ffffffff80d11130 t6 : ff6000000181fa00\n[    6.865561] status: 0000000000000120 badaddr: 0000000000000020 cause: 000000000000000d\n[    6.868046] [\u003cffffffff8008dc94\u003e] timens_commit+0x38/0x11a\n[    6.869089] [\u003cffffffff8008dde8\u003e] timens_on_fork+0x72/0xb4\n[    6.870055] [\u003cffffffff80190096\u003e] begin_new_exec+0x3c6/0x9f0\n[    6.871231] [\u003cffffffff801d826c\u003e] load_elf_binary+0x628/0x1214\n[    6.872304] [\u003cffffffff8018ee7a\u003e] bprm_execve+0x1f2/0x4e4\n[    6.873243] [\u003cffffffff8018f90c\u003e] do_execveat_common+0x16e/0x1ee\n[    6.874258] [\u003cffffffff8018f9c8\u003e] sys_execve+0x3c/0x48\n[    6.875162] [\u003cffffffff80003556\u003e] ret_from_syscall+0x0/0x2\n[    6.877484] ---[ end trace 0000000000000000 ]---\n\nThis is because the mm-\u003econtext.vdso_info is NULL in vfork case. From\nanother side, mm-\u003econtext.vdso_info either points to vdso info\nfor RV64 or vdso info for compat, there's no need to bloat riscv's\nmm_context_t, we can handle the difference when setup the additional\npage for vdso.",
  "id": "CVE-2022-50674",
  "modified": "2026-04-01T23:10:25.943215094Z",
  "published": "2025-12-09T01:29:26.600Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a8616d2dc193b6becc36b5f3cfeaa9ac7a5762f9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/df30c4feba51beeb138f3518c2421abc8cbda3c1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f2419a6fbb4caf8cf3fe0ac7e4cf2e28127d04b4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50674.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50674"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.3",
  "summary": "riscv: vdso: fix NULL deference in vdso_join_timens() when vfork"
}