{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/compaction.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "de8577db09039d4950239b01446ab5ead9028ab4",
              "status": "affected",
              "version": "733aea0b3a7bba0451dfc19322665de13a5b7af4",
              "versionType": "git"
            },
            {
              "lessThan": "018d7ad26cb8bdfe9842f2ca68a42b0bfdcc82fe",
              "status": "affected",
              "version": "733aea0b3a7bba0451dfc19322665de13a5b7af4",
              "versionType": "git"
            },
            {
              "lessThan": "23afc3786acf359c135093893fb43a436768c832",
              "status": "affected",
              "version": "733aea0b3a7bba0451dfc19322665de13a5b7af4",
              "versionType": "git"
            },
            {
              "lessThan": "7da7d599b8a83271c464adfd5ef160202b470570",
              "status": "affected",
              "version": "733aea0b3a7bba0451dfc19322665de13a5b7af4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "mm/compaction.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": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/compaction: handle free_pages_prepare() properly in compaction_free()\n\nfree_pages_prepare() can fail but compaction_free() does not handle the\nfailure case.  Failed pages should not be added back to cc-\u003efreepages for\nfuture use, since they can be either PageHWPoison or free_page_is_bad()\nand might cause data corruption."
        }
      ],
      "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 flaw is in mm/compaction.c compaction_free(), reached only via local kernel memory-management paths (__alloc_pages_slowpath/try_to_compact_pages, kcompactd, or root sysctl), not from network packet handlers or physical device insertion.\nAC:L - An unprivileged attacker can reliably drive compaction (THP/high-order mmap, memory pressure) and concurrently force migrate_pages failures and races so compaction_free() runs on pages where free_pages_prepare() rejects them; both sides are attacker-influenceable.\nPR:L - No special capability is required: ordinary local processes trigger direct compaction through normal allocators and transparent hugepage mappings, and user namespaces do not block these memory syscalls or kcompactd-driven compaction on the host.\nUI:N - Exploitation requires only the attacker\u0027s own memory-allocation and churn activity; no separate victim must mount filesystems, open files, or perform other interactive steps beyond routine process execution.\nS:U - Recycling PageHWPoison or free_page_is_bad() pages corrupts host kernel page-allocator/compaction state and process memory within the same OS security authority, not a VM-guest-to-host or IOMMU boundary crossing.\nC:H - Reusing pages that failed free_pages_prepare() can expose stale kernel or cross-process contents and enables allocator/page aliasing primitives; under the overestimate rule, this memory-corruption class supports high confidentiality impact.\nI:H - The fix explicitly warns these pages may cause data corruption when returned to cc-\u003efreepages; compaction_alloc() later hands them to migrate_pages as destinations, allowing corrupted/compound state to be written into live mappings.\nA:H - Reallocating HWPoison or allocator-marked bad pages during compaction can trigger kernel faults, bad-page detection, oopses, or panics when the poisoned folio is touched, satisfying high availability impact under the kernel crash guidance."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:39:33.783Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/de8577db09039d4950239b01446ab5ead9028ab4"
        },
        {
          "url": "https://git.kernel.org/stable/c/018d7ad26cb8bdfe9842f2ca68a42b0bfdcc82fe"
        },
        {
          "url": "https://git.kernel.org/stable/c/23afc3786acf359c135093893fb43a436768c832"
        },
        {
          "url": "https://git.kernel.org/stable/c/7da7d599b8a83271c464adfd5ef160202b470570"
        }
      ],
      "title": "mm/compaction: handle free_pages_prepare() properly in compaction_free()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72027",
    "datePublished": "2026-08-15T05:51:51.219Z",
    "dateReserved": "2026-08-09T03:40:39.901Z",
    "dateUpdated": "2026-08-17T05:39:33.783Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}