{
  "cveId": "CVE-2026-53401",
  "url": "https://patchblox.com/security/cve/CVE-2026-53401",
  "summary": "CVE-2026-53401 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-53401, released July 20, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "fbdev: omap2: fix use-after-free in omapfb_mmap",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  fbdev: omap2: fix use-after-free in omapfb_mmap  omapfb_mmap() has a race condition with OMAPFB_SETUP_PLANE ioctl that can lead to use-after-free:  The fb_mmap() entry point holds mm_lock but not lock (fb_info-\u003Elock), while ioctl handlers like OMAPFB_SETUP_PLANE hold lock but not mm_lock. This allows concurrent execution.  In omapfb_mmap(): 1. rg = omapfb_get_mem_region(ofbi-\u003Eregion);      // Get old region ref 2. start = omapfb_get_region_paddr(ofbi);          // Read from NEW region 3. len = fix-\u003Esmem_len;                             // Read from NEW region 4. vm_iomap_memory(vma, start, len);               // Map NEW region memory 5. atomic_inc(\u0026rg-\u003Emap_count);                      // Increment OLD region!  Concurrently, OMAPFB_SETUP_PLANE can: - Reassign ofbi-\u003Eregion = new_rg - Update fix-\u003Esmem_len - OMAPFB_SETUP_MEM then checks NEW region\u0027s map_count (0!) and frees it  This leaves userspace with a mapping to freed physical memory.  The fix is to read all required values (start, len) from the same region reference (rg) that will have its map_count incremented, preventing the region from being freed while still mapped.",
  "published": "2026-07-19T12:16:51Z",
  "severity": "Important",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.0014,
  "epssPercentile": 0.03394,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53401",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-53401",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-53401",
      "released": "2026-07-20T12:58:36Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.1.3-1",
      "fix": "DEBIAN-CVE-2026-53401",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-53401",
      "released": "2026-07-20T12:58:36Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}