CVE-2026-53401 (GCVE-0-2026-53401)
Vulnerability from cvelistv5
Published
2026-07-19 12:02
Modified
2026-08-17 04:50
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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->lock), 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->region); // Get old region ref 2. start = omapfb_get_region_paddr(ofbi); // Read from NEW region 3. len = fix->smem_len; // Read from NEW region 4. vm_iomap_memory(vma, start, len); // Map NEW region memory 5. atomic_inc(&rg->map_count); // Increment OLD region! Concurrently, OMAPFB_SETUP_PLANE can: - Reassign ofbi->region = new_rg - Update fix->smem_len - OMAPFB_SETUP_MEM then checks NEW region's 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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 078ff546a806b2c2ab74c25c8edd4c6d4680656a
Version: 078ff546a806b2c2ab74c25c8edd4c6d4680656a
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/omap2/omapfb/omapfb-main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6eb6ebcc8590007ad59ddccc8b5f9201655b33f8",
              "status": "affected",
              "version": "078ff546a806b2c2ab74c25c8edd4c6d4680656a",
              "versionType": "git"
            },
            {
              "lessThan": "7958e67375aa111522086286bba13cfc0816ce8d",
              "status": "affected",
              "version": "078ff546a806b2c2ab74c25c8edd4c6d4680656a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/omap2/omapfb/omapfb-main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.36"
            },
            {
              "lessThan": "2.6.36",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.3",
                  "versionStartIncluding": "2.6.36",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "2.6.36",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027s 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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires local syscalls (mmap and OMAPFB ioctls) against /dev/fb*; there is no network, adjacent-wireless, or physical-device insertion path to this driver code.\nAC:L - The attacker fully controls both sides of the race by opening /dev/fb and running concurrent mmap and OMAPFB_SETUP_PLANE/OMAPFB_SETUP_MEM ioctl threads, with no conditions outside attacker influence required for success.\nPR:L - Exploitation requires only the ability to open the framebuffer character device and issue its ioctls, which on OMAP embedded/kiosk deployments is typically granted to a local application user (video group or equivalent), not real root.\nUI:N - No victim interaction is required; the attacker triggers the race entirely through their own threads operating on a framebuffer device they can already open.\nS:U - Impact is confined to escalating within the same OS security boundary (userspace gaining read/write access to freed kernel/DMA physical memory), not a VM escape or cross-guest boundary crossing.\nC:H - The use-after-free leaves userspace mapped to freed physical pages that can be reallocated with sensitive kernel or DMA data, enabling arbitrary memory disclosure.\nI:H - The stale userspace mapping provides writable access to freed physical memory, enabling corruption of subsequently allocated kernel or DMA buffers and potential control-flow hijacking.\nA:H - Use-after-free of DMA framebuffer memory can cause kernel oopses or panics when freed pages are reused, and the UAF itself constitutes a high availability impact even before full exploitation."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:50:53.662Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6eb6ebcc8590007ad59ddccc8b5f9201655b33f8"
        },
        {
          "url": "https://git.kernel.org/stable/c/7958e67375aa111522086286bba13cfc0816ce8d"
        }
      ],
      "title": "fbdev: omap2: fix use-after-free in omapfb_mmap",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53401",
    "datePublished": "2026-07-19T12:02:01.209Z",
    "dateReserved": "2026-06-09T07:44:35.403Z",
    "dateUpdated": "2026-08-17T04:50:53.662Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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