{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "078ff546a806b2c2ab74c25c8edd4c6d4680656a"
            },
            {
              "fixed": "6eb6ebcc8590007ad59ddccc8b5f9201655b33f8"
            },
            {
              "fixed": "7958e67375aa111522086286bba13cfc0816ce8d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.36"
            },
            {
              "fixed": "7.1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53401.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: omap2: fix use-after-free in omapfb_mmap\n\nomapfb_mmap() has a race condition with OMAPFB_SETUP_PLANE ioctl that\ncan lead to use-after-free:\n\nThe fb_mmap() entry point holds mm_lock but not lock (fb_info-\u003elock),\nwhile ioctl handlers like OMAPFB_SETUP_PLANE hold lock but not mm_lock.\nThis allows concurrent execution.\n\nIn omapfb_mmap():\n1. rg = omapfb_get_mem_region(ofbi-\u003eregion);      // Get old region ref\n2. start = omapfb_get_region_paddr(ofbi);          // Read from NEW region\n3. len = fix-\u003esmem_len;                             // Read from NEW region\n4. vm_iomap_memory(vma, start, len);               // Map NEW region memory\n5. atomic_inc(\u0026rg-\u003emap_count);                      // Increment OLD region!\n\nConcurrently, OMAPFB_SETUP_PLANE can:\n- Reassign ofbi-\u003eregion = new_rg\n- Update fix-\u003esmem_len\n- OMAPFB_SETUP_MEM then checks NEW region's map_count (0!) and frees it\n\nThis leaves userspace with a mapping to freed physical memory.\n\nThe fix is to read all required values (start, len) from the same\nregion reference (rg) that will have its map_count incremented,\npreventing the region from being freed while still mapped.",
  "id": "CVE-2026-53401",
  "modified": "2026-07-22T05:29:52.466703865Z",
  "published": "2026-07-19T12:02:01.209Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6eb6ebcc8590007ad59ddccc8b5f9201655b33f8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7958e67375aa111522086286bba13cfc0816ce8d"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53401.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53401"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "fbdev: omap2: fix use-after-free in omapfb_mmap"
}