{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 7.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2024-50222",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T20:17:05.945317Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "description": "CWE-noinfo Not enough information",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-01T20:27:05.080Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "lib/iov_iter.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4f7ffa83fa79dd52efbaef366c850aaaae06a469",
              "status": "affected",
              "version": "908a1ad89466c1febf20bfe0037b84fc66f8a3f8",
              "versionType": "git"
            },
            {
              "lessThan": "3a303409f271dfe0987b8f79595138340497a32d",
              "status": "affected",
              "version": "908a1ad89466c1febf20bfe0037b84fc66f8a3f8",
              "versionType": "git"
            },
            {
              "lessThan": "c749d9b7ebbc5716af7a95f7768634b30d9446ec",
              "status": "affected",
              "version": "908a1ad89466c1febf20bfe0037b84fc66f8a3f8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "lib/iov_iter.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.60",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.11.*",
              "status": "unaffected",
              "version": "6.11.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.12",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.60",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.11.7",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niov_iter: fix copy_page_from_iter_atomic() if KMAP_LOCAL_FORCE_MAP\n\ngeneric/077 on x86_32 CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP=y with highmem,\non huge=always tmpfs, issues a warning and then hangs (interruptibly):\n\nWARNING: CPU: 5 PID: 3517 at mm/highmem.c:622 kunmap_local_indexed+0x62/0xc9\nCPU: 5 UID: 0 PID: 3517 Comm: cp Not tainted 6.12.0-rc4 #2\n...\ncopy_page_from_iter_atomic+0xa6/0x5ec\ngeneric_perform_write+0xf6/0x1b4\nshmem_file_write_iter+0x54/0x67\n\nFix copy_page_from_iter_atomic() by limiting it in that case\n(include/linux/skbuff.h skb_frag_must_loop() does similar).\n\nBut going forward, perhaps CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP is too\nsurprising, has outlived its usefulness, and should just be removed?"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code is reached through a local `write(2)` syscall on a regular file (`shmem_file_write_iter`/`generic_perform_write` \u2192 `copy_folio_from_iter_atomic`), not through any network-facing protocol handler. Exploitation requires the ability to issue write syscalls on the target system.\nAC:H - The defect exists only when the kernel is built with CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP=y \u2014 with that option off the pre-fix and post-fix code are identical \u2014 and it is a DEBUG_KERNEL-gated x86 debug option explicitly documented \"Disable this for production systems!\", absent from production and distro kernels. The build configuration of the target, plus the need for a large-folio-backed mapping, are conditions the attacker cannot influence.\nPR:L - Any unprivileged local user with write access to a file on a large-folio-capable filesystem (e.g. /dev/shm on huge tmpfs, XFS, bcachefs) can trigger it; no capabilities, namespaces, or mount privileges are required.\nUI:N - The attacker triggers the overrun entirely from its own write syscall with attacker-chosen file offset and length; no action by another user is needed.\nS:U - The out-of-bounds write and the resulting corruption are confined to kernel memory managed by the same kernel security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - Overrunning the single-page kmap slot corrupts adjacent live kmap_local mappings of arbitrary kernel pages, and the short-copy path leaves the folio marked uptodate over a range never written in place, exposing stale page-cache contents to a subsequent read \u2014 a memory-corruption primitive leveragable for kernel information disclosure.\nI:H - Attacker-controlled data is copied past the end of the one-page temporary mapping at an attacker-influenced offset (up to the full folio size), writing into other CPUs\u0027 and outer-nested kmap_local fixmap slots and thereby modifying unrelated kernel-mapped pages.\nA:H - The reported outcome is a WARN at mm/highmem.c:622 followed by an interruptible hang, as `generic_perform_write` retries indefinitely on the zero-length copy; unmapped neighbouring fixmap PTEs and the mismatched kunmap index leave stale mappings that can also oops the kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:42:36.871Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4f7ffa83fa79dd52efbaef366c850aaaae06a469"
        },
        {
          "url": "https://git.kernel.org/stable/c/3a303409f271dfe0987b8f79595138340497a32d"
        },
        {
          "url": "https://git.kernel.org/stable/c/c749d9b7ebbc5716af7a95f7768634b30d9446ec"
        }
      ],
      "title": "iov_iter: fix copy_page_from_iter_atomic() if KMAP_LOCAL_FORCE_MAP",
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        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-50222",
    "datePublished": "2024-11-09T10:14:33.266Z",
    "dateReserved": "2024-10-21T19:36:19.973Z",
    "dateUpdated": "2026-08-05T11:42:36.871Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}