CVE-2022-50240 (GCVE-0-2022-50240)
Vulnerability from cvelistv5
Published
2025-09-15 14:01
Modified
2025-10-10 15:53
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: android: binder: stop saving a pointer to the VMA Do not record a pointer to a VMA outside of the mmap_lock for later use. This is unsafe and there are a number of failure paths *after* the recorded VMA pointer may be freed during setup. There is no callback to the driver to clear the saved pointer from generic mm code. Furthermore, the VMA pointer may become stale if any number of VMA operations end up freeing the VMA so saving it was fragile to being with. Instead, change the binder_alloc struct to record the start address of the VMA and use vma_lookup() to get the vma when needed. Add lockdep mmap_lock checks on updates to the vma pointer to ensure the lock is held and depend on that lock for synchronization of readers and writers - which was already the case anyways, so the smp_wmb()/smp_rmb() was not necessary. [akpm@linux-foundation.org: fix drivers/android/binder_alloc_selftest.c]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/015ac18be7de25d17d6e5f1643cb3b60bfbe859e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1ec3f76a436d750fd5023caec5da0494fc2870d2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/27a594bc7a7c8238d239e3cdbcf2edfa3bbe9a1b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/622ef885a89ad04cfb76ee478fb44f051125d1f1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/925e6b6f82c9c80ab3c17acbde8d16f349da7d26
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a43cfc87caaf46710c8027a8c23b8a55f1078f19
Impacted products
Vendor Product Version
Linux Linux Version: dd2283f2605e3b3e9c61bcae844b34f2afa4813f
Version: dd2283f2605e3b3e9c61bcae844b34f2afa4813f
Version: dd2283f2605e3b3e9c61bcae844b34f2afa4813f
Version: dd2283f2605e3b3e9c61bcae844b34f2afa4813f
Version: dd2283f2605e3b3e9c61bcae844b34f2afa4813f
Version: dd2283f2605e3b3e9c61bcae844b34f2afa4813f
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   Linux Linux Version: 4.20
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{
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          "programFiles": [
            "drivers/android/binder_alloc.c",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nandroid: binder: stop saving a pointer to the VMA\n\nDo not record a pointer to a VMA outside of the mmap_lock for later use. \nThis is unsafe and there are a number of failure paths *after* the\nrecorded VMA pointer may be freed during setup.  There is no callback to\nthe driver to clear the saved pointer from generic mm code.  Furthermore,\nthe VMA pointer may become stale if any number of VMA operations end up\nfreeing the VMA so saving it was fragile to being with.\n\nInstead, change the binder_alloc struct to record the start address of the\nVMA and use vma_lookup() to get the vma when needed.  Add lockdep\nmmap_lock checks on updates to the vma pointer to ensure the lock is held\nand depend on that lock for synchronization of readers and writers - which\nwas already the case anyways, so the smp_wmb()/smp_rmb() was not\nnecessary.\n\n[akpm@linux-foundation.org: fix drivers/android/binder_alloc_selftest.c]"
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      "providerMetadata": {
        "dateUpdated": "2025-10-10T15:53:38.644Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/a43cfc87caaf46710c8027a8c23b8a55f1078f19"
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      "title": "android: binder: stop saving a pointer to the VMA",
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    "cveId": "CVE-2022-50240",
    "datePublished": "2025-09-15T14:01:45.724Z",
    "dateReserved": "2025-09-15T13:58:00.971Z",
    "dateUpdated": "2025-10-10T15:53:38.644Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
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  }
}


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