{
  "cveId": "CVE-2026-90303",
  "url": "https://patchblox.com/security/cve/CVE-2026-90303",
  "summary": "CVE-2026-90303 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-90303, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ARM: 9485/1: mm: acquire mmap write lock around...",
  "description": "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 \u0022user_debug=31\u0022 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 \u003C TASK_SIZE). This is because the lock of tsk-\u003Emm 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 \u0022oops\u0022 state, acquiring a lock may risk a deadlock.",
  "published": "2026-09-17T17:17:27Z",
  "severity": "",
  "epss": 0.0022,
  "epssPercentile": 0.12543,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.190-1",
      "fix": "DEBIAN-CVE-2026-90303",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90303",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.111-1",
      "fix": "DEBIAN-CVE-2026-90303",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90303",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-90303",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90303",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.111-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-90303",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90303",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}