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CVE-2022-49152

Estado: ModificadaMedia (4.7)—

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

XArray: Fix xas_create_range() when multi-order entry present

If there is already an entry present that is of order >= XA_CHUNK_SHIFT when we call xas_create_range(), xas_create_range() will misinterpret that entry as a node and dereference xa_node->parent, generally leading to a crash that looks something like this:

It's deterministically reproducable once you know what the problem is, but producing it in a live kernel requires khugepaged to hit a race. While the problem has been present since xas_create_range() was introduced, I'm not aware of a way to hit it before the page cache was converted to use multi-index entries.

Detalles técnicos trazas, registros y código del informe original
general protection fault, probably for non-canonical address 0xdffffc0000000001:
0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 32 Comm: khugepaged Not tainted 5.17.0-rc8-syzkaller-00003-g56e337f2cf13 #0
RIP: 0010:xa_parent_locked include/linux/xarray.h:1207 [inline]
RIP: 0010:xas_create_range+0x2d9/0x6e0 lib/xarray.c:725

CVSS

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)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2022-49152",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.7,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1
      }
    ]
  },
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      "affectedData": [
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          "vendor": "Linux",
          "product": "Linux",
          "versions": [
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              "version": "6b24ca4a1a8d4ee3221d6d44ddbb99f542e4bda3",
              "lessThan": "18f13edf3424b3b61814b69d5269b2e14584800c",
              "versionType": "git"
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              "versionType": "git"
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          ],
          "programFiles": [
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            "lib/xarray.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
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              "status": "affected",
              "version": "5.17"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.17",
              "versionType": "semver"
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              "version": "5.17.2",
              "versionType": "semver",
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              "status": "unaffected",
              "version": "5.18",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "lib/test_xarray.c",
            "lib/xarray.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-02-26T07:00:52.440",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/18f13edf3424b3b61814b69d5269b2e14584800c",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3e3c658055c002900982513e289398a1aad4a488",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nXArray: Fix xas_create_range() when multi-order entry present\n\nIf there is already an entry present that is of order >= XA_CHUNK_SHIFT\nwhen we call xas_create_range(), xas_create_range() will misinterpret\nthat entry as a node and dereference xa_node->parent, generally leading\nto a crash that looks something like this:\n\ngeneral protection fault, probably for non-canonical address 0xdffffc0000000001:\n0000 [#1] PREEMPT SMP KASAN\nKASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]\nCPU: 0 PID: 32 Comm: khugepaged Not tainted 5.17.0-rc8-syzkaller-00003-g56e337f2cf13 #0\nRIP: 0010:xa_parent_locked include/linux/xarray.h:1207 [inline]\nRIP: 0010:xas_create_range+0x2d9/0x6e0 lib/xarray.c:725\n\nIt's deterministically reproducable once you know what the problem is,\nbut producing it in a live kernel requires khugepaged to hit a race.\nWhile the problem has been present since xas_create_range() was\nintroduced, I'm not aware of a way to hit it before the page cache was\nconverted to use multi-index entries."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: XArray: Arreglar xas_create_range() cuando hay una entrada de orden múltiple presente Si ya hay una entrada presente que es de orden >= XA_CHUNK_SHIFT cuando llamamos a xas_create_range(), xas_create_range() malinterpretará esa entrada como un nodo y desreferenciará xa_node->parent, generalmente provocando un bloqueo que se parece a esto: error de protección general, probablemente para una dirección no canónica 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref en el rango [0x000000000000008-0x000000000000000f] CPU: 0 PID: 32 Comm: khugepaged No contaminado 5.17.0-rc8-syzkaller-00003-g56e337f2cf13 #0 RIP: 0010:xa_parent_locked include/linux/xarray.h:1207 [inline] RIP: 0010:xas_create_range+0x2d9/0x6e0 lib/xarray.c:725 Es deterministamente reproducible una vez que sabes cuál es el problema, pero producirlo en un núcleo en vivo requiere que khugepaged alcance una ejecución. Si bien el problema ha estado presente desde que se introdujo xas_create_range(), no conozco una forma de alcanzarlo antes de que la caché de páginas se convirtiera para usar entradas de índice múltiple."
    }
  ],
  "lastModified": "2026-06-17T05:17:13.630",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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          "operator": "OR"
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}