CVE-2026-90303 (GCVE-0-2026-90303)
Vulnerability from cvelistv5
Published
2026-09-17 16:08
Modified
2026-10-19 09:01
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faults When CONFIG_DEBUG_USER=y, and cmdline "user_debug=31" is set, a user fault may trigger show_pte() without any lock. If another thread in the same process concurrently calls munmap(), the page table pages may be freed while show_pte() is still traversing them, causing a use-after-free in show_pte(). If CONFIG_ARM_LPAE=y, this may cause a kernel panic if the pages table of PMD are freed when show_pte() is running. Acquire mmap_write_lock() around show_pte() for user faults to fix the contention. For user faults, additionally restrict that show_pte() is called only when the addr is a user-space address (addr < TASK_SIZE). This is because the lock of tsk->mm only protects the virtual memory of user address space, furthermore, dumping the page tables of a kernel-space address for user faults is unnecessary and may have security implications. Keep everything unchanged for kernel faults, because the kernel is already in the "oops" state, acquiring a lock may risk a deadlock.
References
Impacted products
Vendor Product Version
Linux Linux Version: 6d021b724481fbb908eb29384898deb9f00dfe70
Version: 6d021b724481fbb908eb29384898deb9f00dfe70
Version: 6d021b724481fbb908eb29384898deb9f00dfe70
Version: 6d021b724481fbb908eb29384898deb9f00dfe70
Version: 6d021b724481fbb908eb29384898deb9f00dfe70
Version: 6d021b724481fbb908eb29384898deb9f00dfe70
Version: 6d021b724481fbb908eb29384898deb9f00dfe70
Version: 6d021b724481fbb908eb29384898deb9f00dfe70
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm/mm/fault.c"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faults\n\nWhen CONFIG_DEBUG_USER=y, and cmdline \"user_debug=31\" is set,\na user fault may trigger show_pte() without any lock.\nIf another thread in the same process concurrently calls munmap(),\nthe page table pages may be freed while show_pte() is still traversing\nthem, causing a use-after-free in show_pte().\n\nIf CONFIG_ARM_LPAE=y, this may cause a kernel panic if the pages table\nof PMD are freed when show_pte() is running.\n\nAcquire mmap_write_lock() around show_pte() for user faults to fix the\ncontention.\n\nFor user faults, additionally restrict that show_pte() is called only\nwhen the addr is a user-space address (addr \u003c TASK_SIZE). This is because\nthe lock of tsk-\u003emm only protects the virtual memory of user address space,\nfurthermore, dumping the page tables of a kernel-space address for user\nfaults is unnecessary and may have security implications.\n\nKeep everything unchanged for kernel faults, because the kernel is\nalready in the \"oops\" state, acquiring a lock may risk a deadlock."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:01:21.209Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ab14f07952adfe735d86a53518f8cd576dfd5892"
        },
        {
          "url": "https://git.kernel.org/stable/c/07e4d5380f2a844ab7a1b440dde350caf561cbb0"
        },
        {
          "url": "https://git.kernel.org/stable/c/2a14d7797a49a47bccd1a9327fd69da838dcb0dd"
        },
        {
          "url": "https://git.kernel.org/stable/c/63e3c958a602d0896a101a897c2361878c266ca7"
        },
        {
          "url": "https://git.kernel.org/stable/c/59bbf86d0ff9373bfa033ca123c1e924f09f1eba"
        },
        {
          "url": "https://git.kernel.org/stable/c/c71f9a56520b419e55d173052629f2324deb5549"
        },
        {
          "url": "https://git.kernel.org/stable/c/720408d98d9fb3c91a12090436734c8c61f04545"
        },
        {
          "url": "https://git.kernel.org/stable/c/1039bffd6ae9c75b42b7d148d6c1106134107b66"
        }
      ],
      "title": "ARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faults",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90303",
    "datePublished": "2026-09-17T16:08:26.455Z",
    "dateReserved": "2026-09-11T19:38:34.799Z",
    "dateUpdated": "2026-10-19T09:01:21.209Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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