{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-42234",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T16:14:10.736603Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-11T17:34:32.409Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/memcontrol.c",
            "mm/migrate.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "fc7facce686b64201dbf0b9614cc1d0bfad70010",
              "status": "affected",
              "version": "9bcef5973e31020e5aa8571eb994d67b77318356",
              "versionType": "git"
            },
            {
              "lessThan": "be9581ea8c058d81154251cb0695987098996cad",
              "status": "affected",
              "version": "9bcef5973e31020e5aa8571eb994d67b77318356",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "mm/memcontrol.c",
            "mm/migrate.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.7"
            },
            {
              "lessThan": "6.7",
              "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": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.10",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: fix crashes from deferred split racing folio migration\n\nEven on 6.10-rc6, I\u0027ve been seeing elusive \"Bad page state\"s (often on\nflags when freeing, yet the flags shown are not bad: PG_locked had been\nset and cleared??), and VM_BUG_ON_PAGE(page_ref_count(page) == 0)s from\ndeferred_split_scan()\u0027s folio_put(), and a variety of other BUG and WARN\nsymptoms implying double free by deferred split and large folio migration.\n\n6.7 commit 9bcef5973e31 (\"mm: memcg: fix split queue list crash when large\nfolio migration\") was right to fix the memcg-dependent locking broken in\n85ce2c517ade (\"memcontrol: only transfer the memcg data for migration\"),\nbut missed a subtlety of deferred_split_scan(): it moves folios to its own\nlocal list to work on them without split_queue_lock, during which time\nfolio-\u003e_deferred_list is not empty, but even the \"right\" lock does nothing\nto secure the folio and the list it is on.\n\nFortunately, deferred_split_scan() is careful to use folio_try_get(): so\nfolio_migrate_mapping() can avoid the race by folio_undo_large_rmappable()\nwhile the old folio\u0027s reference count is temporarily frozen to 0 - adding\nsuch a freeze in the !mapping case too (originally, folio lock and\nunmapping and no swap cache left an anon folio unreachable, so no freezing\nwas needed there: but the deferred split queue offers a way to reach it)."
        }
      ],
      "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 in core mm (THP deferred split queue vs. folio migration) and is reached entirely through local syscalls \u2014 mmap/madvise(MADV_HUGEPAGE)/munmap to queue folios, memory pressure to invoke the shrinker, and move_pages/mbind or direct compaction to migrate them. No network or physical access is involved.\nAC:L - The attacker controls both sides of the race and can create it deliberately: one thread loops partial-unmapping large anon folios onto the deferred split queue while others generate reclaim pressure and issue move_pages()/fault THPs to drive migration of those same folios. Retrying is free and unlimited, and no attacker-independent condition is required \u2014 the race was hit even accidentally under ordinary load.\nPR:L - Only an ordinary unprivileged local user is needed; move_pages() on the caller\u0027s own process requires just ptrace_may_access() on self and MPOL_MF_MOVE, not CAP_SYS_NICE, and THP allocation, partial unmap, and memory pressure need no capabilities at all.\nUI:N - The attacking process performs all steps itself with no victim action required; the shrinker and compaction/migration paths run autonomously in kernel context.\nS:U - The corruption is of kernel page/folio state within the same security authority as the exploited kernel; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The double free / refcount underflow returns a page to the buddy allocator while it is still mapped into the attacker\u0027s address space, allowing that page to be reallocated as a kernel slab page, page table, or kernel stack and read directly from userspace, giving arbitrary kernel memory disclosure.\nI:H - The same cross-allocation aliasing gives an arbitrary kernel write primitive \u2014 the attacker retains a writable userspace mapping of a page the kernel has re-handed to internal structures \u2014 plus the list corruption itself writes attacker-influenced pointers into the global split queue, making control-flow hijack and privilege escalation feasible.\nA:H - The reported symptoms are outright kernel crashes \u2014 \"Bad page state\", VM_BUG_ON_PAGE(page_ref_count(page) == 0), list_del corruption BUGs and assorted WARNs from double free \u2014 any of which panics or destabilizes the system, and the condition can be triggered repeatedly."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:35:59.332Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fc7facce686b64201dbf0b9614cc1d0bfad70010"
        },
        {
          "url": "https://git.kernel.org/stable/c/be9581ea8c058d81154251cb0695987098996cad"
        }
      ],
      "title": "mm: fix crashes from deferred split racing folio migration",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-42234",
    "datePublished": "2024-08-07T15:14:24.467Z",
    "dateReserved": "2024-07-30T07:40:12.252Z",
    "dateUpdated": "2026-08-05T11:35:59.332Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}