MIPS: pgalloc: fix memory leak caused by pgd_free()

{
  "id": "cc325b3ba521d27d12a5e2dd7f49d4d755ad397bcdfd8918cfc7c39e76dda588",
  "url": "https://osv.dev/vulnerability/CVE-2022-49210",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "MIPS: pgalloc: fix memory leak caused by pgd_free()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: MIPS: pgalloc: fix memory leak caused by pgd_free() pgd page is freed by generic implementation pgd_free() since commit f9cb654cb550 (\"asm-generic: pgalloc: provide generic pgd_free()\"), however, there are scenarios that the system uses more than one page as the pgd table, in such cases the generic implementation pgd_free() won't be applicable anymore. For example, when PAGE_SIZE_4KB is enabled and MIPS_VA_BITS_48 is not enabled in a 64bit system, the macro \"PGD_ORDER\" will be set as \"1\", which will cause allocating two pages as the pgd table. Well, at the same time, the generic implementation pgd_free() just free one pgd page, which will result in the memory leak. The memory leak can be easily detected by executing shell command: \"while true; do ls > /dev/null; grep MemFree /proc/meminfo; done\"",
    "evidence": "osv:CVE-2022-49210",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.110",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.33",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.16.19",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.17.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2022-49210",
      "aliases": [
        "CVE-2022-49210"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/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": "f9cb654cb550b7b87e8608b14fc3eca432429ffe"
                },
                {
                  "fixed": "fa3d44424579972cc7c4fac3d9cf227798ebdfa0"
                },
                {
                  "fixed": "d29cda15cab086d82d692de016f7249545d4b6b4"
                },
                {
                  "fixed": "5a8501d34b261906e4c76ec9da679f2cb4d309ed"
                },
                {
                  "fixed": "1bf0d78c8cc3cf615a6e7bf33ada70b73592f0a1"
                },
                {
                  "fixed": "2bc5bab9a763d520937e4f3fe8df51c6a1eceb97"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49210.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.9.0"
                },
                {
                  "fixed": "5.10.110"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.33"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "5.16.19"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.17.0"
                },
                {
                  "fixed": "5.17.2"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49210.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:44.929646581Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1bf0d78c8cc3cf615a6e7bf33ada70b73592f0a1",
        "https://git.kernel.org/stable/c/2bc5bab9a763d520937e4f3fe8df51c6a1eceb97",
        "https://git.kernel.org/stable/c/5a8501d34b261906e4c76ec9da679f2cb4d309ed",
        "https://git.kernel.org/stable/c/d29cda15cab086d82d692de016f7249545d4b6b4",
        "https://git.kernel.org/stable/c/fa3d44424579972cc7c4fac3d9cf227798ebdfa0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49210.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49210",
        "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/2022/49xxx/CVE-2022-49210.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-49210",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 512559,
  "published_at": "2025-02-26T01:55:47.679+00:00"
}