arm64: fix oops in concurrently setting insn_emulation sysctls

{
  "id": "a6490ba1df761b243a6c0b7bc9d36d8890343cb294e0a58e82147d3c2c68f0e1",
  "url": "https://osv.dev/vulnerability/CVE-2022-50206",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "arm64: fix oops in concurrently setting insn_emulation sysctls",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: arm64: fix oops in concurrently setting insn_emulation sysctls emulation_proc_handler() changes table->data for proc_dointvec_minmax and can generate the following Oops if called concurrently with itself: | Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010 | Internal error: Oops: 96000006 [#1] SMP | Call trace: | update_insn_emulation_mode+0xc0/0x148 | emulation_proc_handler+0x64/0xb8 | proc_sys_call_handler+0x9c/0xf8 | proc_sys_write+0x18/0x20 | __vfs_write+0x20/0x48 | vfs_write+0xe4/0x1d0 | ksys_write+0x70/0xf8 | __arm64_sys_write+0x20/0x28 | el0_svc_common.constprop.0+0x7c/0x1c0 | el0_svc_handler+0x2c/0xa0 | el0_svc+0x8/0x200 To fix this issue, keep the table->data as &insn->current_mode and use container_of() to retrieve the insn pointer. Another mutex is used to protect against the current_mode update but not for retrieving insn_emulation as table->data is no longer changing.",
    "evidence": "osv:CVE-2022-50206",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.14.291",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "4.19.256",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.4.211",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.137",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.61",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.18.18",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.19.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2022-50206",
      "aliases": [
        "CVE-2022-50206"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "587064b610c703f259317d00dc37bf6d40f4fc74"
                },
                {
                  "fixed": "9d5fec6ba2e4117d196a8259ab54615ffe562460"
                },
                {
                  "fixed": "b51881b1da57fe9877125dfdd0aac5172958fcfd"
                },
                {
                  "fixed": "04549063d5701976034d8c2bfda3d3a8cbf0409f"
                },
                {
                  "fixed": "353b4673d01c512303c45cf2346f630cda73b5c9"
                },
                {
                  "fixed": "cc69ef95988b9ef2fc730ec452a7441efb90ef5e"
                },
                {
                  "fixed": "6a2fd114678d7fc1b5a0f8865ae98f1c17787455"
                },
                {
                  "fixed": "07022e07017ee5540f5559b0aeb916e8383c1e1a"
                },
                {
                  "fixed": "af483947d472eccb79e42059276c4deed76f99a6"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50206.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "3.19.0"
                },
                {
                  "fixed": "4.14.291"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.15.0"
                },
                {
                  "fixed": "4.19.256"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.20.0"
                },
                {
                  "fixed": "5.4.211"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.5.0"
                },
                {
                  "fixed": "5.10.137"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.61"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "5.18.18"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.19.0"
                },
                {
                  "fixed": "5.19.2"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50206.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.731274265Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/04549063d5701976034d8c2bfda3d3a8cbf0409f",
        "https://git.kernel.org/stable/c/07022e07017ee5540f5559b0aeb916e8383c1e1a",
        "https://git.kernel.org/stable/c/353b4673d01c512303c45cf2346f630cda73b5c9",
        "https://git.kernel.org/stable/c/6a2fd114678d7fc1b5a0f8865ae98f1c17787455",
        "https://git.kernel.org/stable/c/9d5fec6ba2e4117d196a8259ab54615ffe562460",
        "https://git.kernel.org/stable/c/af483947d472eccb79e42059276c4deed76f99a6",
        "https://git.kernel.org/stable/c/b51881b1da57fe9877125dfdd0aac5172958fcfd",
        "https://git.kernel.org/stable/c/cc69ef95988b9ef2fc730ec452a7441efb90ef5e",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50206.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-50206",
        "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-2022-50206.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-50206",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 517763,
  "published_at": "2025-06-18T11:03:46.505+00:00"
}