{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72027",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72027"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "mm/compaction: handle free_pages_prepare() properly in compaction_free()",
  "details": "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->freepages for\nfuture use, since they can be either PageHWPoison or free_page_is_bad()\nand might cause data corruption.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72027"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/de8577db09039d4950239b01446ab5ead9028ab4"
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      "url": "https://git.kernel.org/stable/c/018d7ad26cb8bdfe9842f2ca68a42b0bfdcc82fe"
    },
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      "url": "https://git.kernel.org/stable/c/23afc3786acf359c135093893fb43a436768c832"
    },
    {
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      "url": "https://git.kernel.org/stable/c/7da7d599b8a83271c464adfd5ef160202b470570"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "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's 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->freepages; 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."
    }
  }
}