iov_iter: fix copy_page_from_iter_atomic() if KMAP_LOCAL_FORCE_MAP

{
  "id": "c89f3886361b7cbd4dbf3695fd03e948aa3115573b12a4aa7aa2adf2d100c60c",
  "url": "https://osv.dev/vulnerability/CVE-2024-50222",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "iov_iter: fix copy_page_from_iter_atomic() if KMAP_LOCAL_FORCE_MAP",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: iov_iter: fix copy_page_from_iter_atomic() if KMAP_LOCAL_FORCE_MAP generic/077 on x86_32 CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP=y with highmem, on huge=always tmpfs, issues a warning and then hangs (interruptibly): WARNING: CPU: 5 PID: 3517 at mm/highmem.c:622 kunmap_local_indexed+0x62/0xc9 CPU: 5 UID: 0 PID: 3517 Comm: cp Not tainted 6.12.0-rc4 #2 ... copy_page_from_iter_atomic+0xa6/0x5ec generic_perform_write+0xf6/0x1b4 shmem_file_write_iter+0x54/0x67 Fix copy_page_from_iter_atomic() by limiting it in that case (include/linux/skbuff.h skb_frag_must_loop() does similar). But going forward, perhaps CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP is too surprising, has outlived its usefulness, and should just be removed?",
    "evidence": "osv:CVE-2024-50222",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.60",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.11.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2024-50222",
      "aliases": [
        "CVE-2024-50222"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "908a1ad89466c1febf20bfe0037b84fc66f8a3f8"
                },
                {
                  "fixed": "4f7ffa83fa79dd52efbaef366c850aaaae06a469"
                },
                {
                  "fixed": "3a303409f271dfe0987b8f79595138340497a32d"
                },
                {
                  "fixed": "c749d9b7ebbc5716af7a95f7768634b30d9446ec"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-50222.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.6.0"
                },
                {
                  "fixed": "6.6.60"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.11.7"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-50222.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.458786089Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3a303409f271dfe0987b8f79595138340497a32d",
        "https://git.kernel.org/stable/c/4f7ffa83fa79dd52efbaef366c850aaaae06a469",
        "https://git.kernel.org/stable/c/c749d9b7ebbc5716af7a95f7768634b30d9446ec",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50222.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-50222",
        "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/2024/50xxx/CVE-2024-50222.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-50222",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492699,
  "published_at": "2024-11-09T10:14:33.266+00:00"
}