{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "3aa31a8bb11e47c0ff2b306988d1756b810c1c3c"
            },
            {
              "fixed": "6b98fd7106d4e486f432664893dcd4d6fa3a9693"
            },
            {
              "fixed": "b344ca94e8cc85796f16ea25e2e5a8e0303fe813"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98242.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndma-buf: Fix silent overflow for phys vec to sgt\n\nIn case MMIO size is bigger than 4G and peer2peer DMA goes\nthrough host bridge, we trigger a code path that assigns the\ntotal linked IOVA (which is greater than 4G) to mapped_len.\n\nPreviously, `mapped_len` was declared as 32-bit `unsigned int`.\nWhen accumulating `size_t` lengths, this leads to a silent wrap-around.\nThis truncation causes truncated lengths to be passed to functions\nlike `fill_sg_entry()`.\n\nFix this by changing `mapped_len` to `size_t` (64-bit). While\nat it, fix similar potential overflow issues in `calc_sg_nents`\nby using `check_add_overflow()` for `nents` and using\n`unsigned int` for the loop iterator in `fill_sg_entry` to match.",
  "id": "CVE-2026-98242",
  "modified": "2026-10-08T02:30:31.729864648Z",
  "published": "2026-10-06T08:45:12.662Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b98fd7106d4e486f432664893dcd4d6fa3a9693"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b344ca94e8cc85796f16ea25e2e5a8e0303fe813"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98242.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98242"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "dma-buf: Fix silent overflow for phys vec to sgt"
}