{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "6d021b724481fbb908eb29384898deb9f00dfe70"
            },
            {
              "fixed": "ab14f07952adfe735d86a53518f8cd576dfd5892"
            },
            {
              "fixed": "07e4d5380f2a844ab7a1b440dde350caf561cbb0"
            },
            {
              "fixed": "2a14d7797a49a47bccd1a9327fd69da838dcb0dd"
            },
            {
              "fixed": "63e3c958a602d0896a101a897c2361878c266ca7"
            },
            {
              "fixed": "59bbf86d0ff9373bfa033ca123c1e924f09f1eba"
            },
            {
              "fixed": "c71f9a56520b419e55d173052629f2324deb5549"
            },
            {
              "fixed": "720408d98d9fb3c91a12090436734c8c61f04545"
            },
            {
              "fixed": "1039bffd6ae9c75b42b7d148d6c1106134107b66"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90303.json"
  },
  "details": "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.",
  "id": "CVE-2026-90303",
  "modified": "2026-09-19T03:30:16.427592578Z",
  "published": "2026-09-17T16:08:26.455Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/07e4d5380f2a844ab7a1b440dde350caf561cbb0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1039bffd6ae9c75b42b7d148d6c1106134107b66"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a14d7797a49a47bccd1a9327fd69da838dcb0dd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/59bbf86d0ff9373bfa033ca123c1e924f09f1eba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/63e3c958a602d0896a101a897c2361878c266ca7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/720408d98d9fb3c91a12090436734c8c61f04545"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab14f07952adfe735d86a53518f8cd576dfd5892"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c71f9a56520b419e55d173052629f2324deb5549"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90303.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90303"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "ARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faults"
}