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CVE-2026-72212

Estado: RecibidaSin puntuar—

In the Linux kernel, the following vulnerability has been resolved:

mm/memory_hotplug: fix incorrect altmap passing in error path

In create_altmaps_and_memory_blocks(), when arch_add_memory() succeeds with memmap_on_memory enabled, the vmemmap pages are allocated from params.altmap. If create_memory_block_devices() subsequently fails, the error path calls arch_remove_memory() with a NULL altmap instead of params.altmap.

This is a bug that could lead to memory corruption. Since altmap is NULL, vmemmap_free() falls back to freeing the vmemmap pages into the system buddy allocator via free_pages() instead of the altmap. arch_remove_memory() then immediately destroys the physical linear mapping for this memory. This injects unowned pages into the buddy allocator, causing machine checks or memory corruption if the system later attempts to allocate and use those freed pages.

Leer descripción completaMostrar menos

Fix this by passing params.altmap to arch_remove_memory() in the error path.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-72212",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6b8f0798b85aa529011570369db985a788f3003f",
              "lessThan": "3833e6abdbbfb59ec8203a84a84206cb7ffb41ac",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6b8f0798b85aa529011570369db985a788f3003f",
              "lessThan": "722e6c54bde6391fb95f0357f555aca887c7b18c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6b8f0798b85aa529011570369db985a788f3003f",
              "lessThan": "2f9e3ec17c3d2093c664c00a027588a446c39894",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6b8f0798b85aa529011570369db985a788f3003f",
              "lessThan": "2fac4afa0e2e68841334c78c1821e49f74fbc66a",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "mm/memory_hotplug.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.8",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "mm/memory_hotplug.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T06:21:39.913",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/2f9e3ec17c3d2093c664c00a027588a446c39894",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2fac4afa0e2e68841334c78c1821e49f74fbc66a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3833e6abdbbfb59ec8203a84a84206cb7ffb41ac",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/722e6c54bde6391fb95f0357f555aca887c7b18c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/memory_hotplug: fix incorrect altmap passing in error path\n\nIn create_altmaps_and_memory_blocks(), when arch_add_memory() succeeds\nwith memmap_on_memory enabled, the vmemmap pages are allocated from\nparams.altmap.  If create_memory_block_devices() subsequently fails, the\nerror path calls arch_remove_memory() with a NULL altmap instead of\nparams.altmap.\n\nThis is a bug that could lead to memory corruption.  Since altmap is NULL,\nvmemmap_free() falls back to freeing the vmemmap pages into the system\nbuddy allocator via free_pages() instead of the altmap. \narch_remove_memory() then immediately destroys the physical linear mapping\nfor this memory.  This injects unowned pages into the buddy allocator,\ncausing machine checks or memory corruption if the system later attempts\nto allocate and use those freed pages.\n\nFix this by passing params.altmap to arch_remove_memory() in the error\npath."
    }
  ],
  "lastModified": "2026-08-17T06:18:22.150",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}