CVE-2025-38364 (GCVE-0-2025-38364)
Vulnerability from cvelistv5
Published
2025-07-25 12:47
Modified
2025-07-28 04:19
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: maple_tree: fix MA_STATE_PREALLOC flag in mas_preallocate() Temporarily clear the preallocation flag when explicitly requesting allocations. Pre-existing allocations are already counted against the request through mas_node_count_gfp(), but the allocations will not happen if the MA_STATE_PREALLOC flag is set. This flag is meant to avoid re-allocating in bulk allocation mode, and to detect issues with preallocation calculations. The MA_STATE_PREALLOC flag should also always be set on zero allocations so that detection of underflow allocations will print a WARN_ON() during consumption. User visible effect of this flaw is a WARN_ON() followed by a null pointer dereference when subsequent requests for larger number of nodes is ignored, such as the vma merge retry in mmap_region() caused by drivers altering the vma flags (which happens in v6.6, at least)
References
Impacted products
Vendor Product Version
Linux Linux Version: 54a611b605901c7d5d05b6b8f5d04a6ceb0962aa
Version: 54a611b605901c7d5d05b6b8f5d04a6ceb0962aa
Version: 54a611b605901c7d5d05b6b8f5d04a6ceb0962aa
Version: 54a611b605901c7d5d05b6b8f5d04a6ceb0962aa
Version: 54a611b605901c7d5d05b6b8f5d04a6ceb0962aa
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{
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          "product": "Linux",
          "programFiles": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmaple_tree: fix MA_STATE_PREALLOC flag in mas_preallocate()\n\nTemporarily clear the preallocation flag when explicitly requesting\nallocations.  Pre-existing allocations are already counted against the\nrequest through mas_node_count_gfp(), but the allocations will not happen\nif the MA_STATE_PREALLOC flag is set.  This flag is meant to avoid\nre-allocating in bulk allocation mode, and to detect issues with\npreallocation calculations.\n\nThe MA_STATE_PREALLOC flag should also always be set on zero allocations\nso that detection of underflow allocations will print a WARN_ON() during\nconsumption.\n\nUser visible effect of this flaw is a WARN_ON() followed by a null pointer\ndereference when subsequent requests for larger number of nodes is\nignored, such as the vma merge retry in mmap_region() caused by drivers\naltering the vma flags (which happens in v6.6, at least)"
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      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:19:59.751Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/fba46a5d83ca8decb338722fb4899026d8d9ead2"
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      ],
      "title": "maple_tree: fix MA_STATE_PREALLOC flag in mas_preallocate()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38364",
    "datePublished": "2025-07-25T12:47:34.548Z",
    "dateReserved": "2025-04-16T04:51:24.008Z",
    "dateUpdated": "2025-07-28T04:19:59.751Z",
    "state": "PUBLISHED"
  },
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  }
}


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