{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-42233",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T16:14:13.816205Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-11T17:34:32.513Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/filemap.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6a6c2aec1a89506595801b4cf7e8eef035f33748",
              "status": "affected",
              "version": "58f327f2ce80f9c7b4a70e9cf017ae8810d44a20",
              "versionType": "git"
            },
            {
              "lessThan": "24be02a42181f0707be0498045c4c4b13273b16d",
              "status": "affected",
              "version": "58f327f2ce80f9c7b4a70e9cf017ae8810d44a20",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "mm/filemap.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.9"
            },
            {
              "lessThan": "6.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.9.*",
              "status": "unaffected",
              "version": "6.9.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.10",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.9.10",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.10",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfilemap: replace pte_offset_map() with pte_offset_map_nolock()\n\nThe vmf-\u003eptl in filemap_fault_recheck_pte_none() is still set from\nhandle_pte_fault().  But at the same time, we did a pte_unmap(vmf-\u003epte). \nAfter a pte_unmap(vmf-\u003epte) unmap and rcu_read_unlock(), the page table\nmay be racily changed and vmf-\u003eptl maybe fails to protect the actual page\ntable.  Fix this by replacing pte_offset_map() with\npte_offset_map_nolock().\n\nAs David said, the PTL pointer might be stale so if we continue to use\nit infilemap_fault_recheck_pte_none(), it might trigger UAF.  Also, if\nthe PTL fails, the issue fixed by commit 58f327f2ce80 (\"filemap: avoid\nunnecessary major faults in filemap_fault()\") might reappear."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerability is triggered by a normal page fault on a locally mmap\u0027ed file, reached through mmap/mlock2/madvise syscalls by a process on the machine. There is no network-facing path to `filemap_fault()`.\nAC:L - Although a race is involved, the attacker owns both sides of it: one thread faults on its own mlocked, page-cache-cold file mapping while another unprivileged thread issues `MADV_COLLAPSE`, and both only need `mmap_lock` read so they run concurrently. All preconditions (VM_LOCKED, pte_none, page-cache miss, page-table collapse) are set up deterministically by the attacker and the attempt can be retried in a tight loop.\nPR:L - Only an ordinary unprivileged local user account is required \u2014 `can_do_mlock()` passes on the default nonzero RLIMIT_MEMLOCK with no capability, and `MADV_COLLAPSE` requires no privilege. No root, no CAP_* and no namespace tricks are needed.\nUI:N - The attacker\u0027s own threads perform every step \u2014 mapping and locking a file, faulting on it, and collapsing the page table. No victim action or interaction is involved.\nS:U - The use-after-free corrupts kernel memory within the same kernel security authority; there is no crossing of a VM, IOMMU, or other security-authority boundary.\nC:H - This is a use-after-free on the split page-table lock: `spin_lock()`/`spin_unlock()` read a freed object that the attacker can have reallocated with sprayed content, and the resulting slab/`struct page` metadata corruption (overlapping allocations) is a well-known route to arbitrary kernel memory disclosure.\nI:H - Taking the stale lock writes into freed memory \u2014 either a reallocated `kmem_cache` object (ALLOC_SPLIT_PTLOCKS) or word 5 of a reused `struct page`, which aliases `struct slab::counters` (inuse/objects/frozen) and `page-\u003eprivate`. Corrupting slab metadata yields overlapping object allocations and a path to arbitrary write and control-flow hijack.\nA:H - A use-after-free on a spinlock reliably produces oopses, slab corruption panics, and deadlocks/hangs when the freed lock word is reused and never released. Any unprivileged user can trigger it repeatedly to crash the system."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:35:58.248Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6a6c2aec1a89506595801b4cf7e8eef035f33748"
        },
        {
          "url": "https://git.kernel.org/stable/c/24be02a42181f0707be0498045c4c4b13273b16d"
        }
      ],
      "title": "filemap: replace pte_offset_map() with pte_offset_map_nolock()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-42233",
    "datePublished": "2024-08-07T15:14:23.858Z",
    "dateReserved": "2024-07-30T07:40:12.251Z",
    "dateUpdated": "2026-08-05T11:35:58.248Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}