fkie_cve-2024-26630
Vulnerability from fkie_nvd
Published
2024-03-13 16:15
Modified
2025-03-13 19:36
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: mm: cachestat: fix folio read-after-free in cache walk In cachestat, we access the folio from the page cache's xarray to compute its page offset, and check for its dirty and writeback flags. However, we do not hold a reference to the folio before performing these actions, which means the folio can concurrently be released and reused as another folio/page/slab. Get around this altogether by just using xarray's existing machinery for the folio page offsets and dirty/writeback states. This changes behavior for tmpfs files to now always report zeroes in their dirty and writeback counters. This is okay as tmpfs doesn't follow conventional writeback cache behavior: its pages get "cleaned" during swapout, after which they're no longer resident etc.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3a75cb05d53f4a6823a32deb078de1366954a804Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ba60fdf75e89ea762bb617be578dc47f27655117Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fe7e008e0ce728252e4ec652cceebcc62211657cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3a75cb05d53f4a6823a32deb078de1366954a804Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ba60fdf75e89ea762bb617be578dc47f27655117Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/fe7e008e0ce728252e4ec652cceebcc62211657cPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.8
linux linux_kernel 6.8
linux linux_kernel 6.8
linux linux_kernel 6.8
linux linux_kernel 6.8
linux linux_kernel 6.8


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: cachestat: fix folio read-after-free in cache walk\n\nIn cachestat, we access the folio from the page cache\u0027s xarray to compute\nits page offset, and check for its dirty and writeback flags.  However, we\ndo not hold a reference to the folio before performing these actions,\nwhich means the folio can concurrently be released and reused as another\nfolio/page/slab.\n\nGet around this altogether by just using xarray\u0027s existing machinery for\nthe folio page offsets and dirty/writeback states.\n\nThis changes behavior for tmpfs files to now always report zeroes in their\ndirty and writeback counters.  This is okay as tmpfs doesn\u0027t follow\nconventional writeback cache behavior: its pages get \"cleaned\" during\nswapout, after which they\u0027re no longer resident etc."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm: cachestat: corrige read-after-free la publicaci\u00f3n en cache walk En cachestat, accedemos a la publicaci\u00f3n desde la matriz x de la cach\u00e9 de la p\u00e1gina para calcular su desplazamiento de p\u00e1gina y comprobar si est\u00e1 sucia y banderas de reescritura. Sin embargo, no mantenemos una referencia al folio antes de realizar estas acciones, lo que significa que el folio se puede liberar y reutilizar simult\u00e1neamente como otro folio/p\u00e1gina/losa. Evite esto por completo simplemente utilizando la maquinaria existente de xarray para los desplazamientos de p\u00e1ginas de folio y los estados sucios/de reescritura. Esto cambia el comportamiento de los archivos tmpfs para que ahora siempre informen ceros en sus contadores sucios y de reescritura. Esto est\u00e1 bien ya que tmpfs no sigue el comportamiento de cach\u00e9 de reescritura convencional: sus p\u00e1ginas se \"limpian\" durante el intercambio, despu\u00e9s del cual ya no residen, etc."
    }
  ],
  "id": "CVE-2024-26630",
  "lastModified": "2025-03-13T19:36:45.610",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2024-03-13T16:15:30.047",
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  "vulnStatus": "Analyzed",
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          "value": "CWE-416"
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      "source": "nvd@nist.gov",
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}


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