{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "bd61848900bff597764238f3a8ec67c815cd316e"
            },
            {
              "fixed": "134c517dfa63203287b2aad6558017f42435a02e"
            },
            {
              "fixed": "d5008e4e4ee6b739256b796702a7d1aae1b5c3b4"
            },
            {
              "fixed": "4eb82ba543421e9e38cc14e4e82058b78850df50"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.16.0"
            },
            {
              "fixed": "6.18.35"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64124.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: devmem: reject dma-buf bind with non-page-aligned size or SG length\n\nnet_devmem_bind_dmabuf() trusts dmabuf-\u003esize and sg_dma_len() to be\nPAGE_SIZE multiples without checking:\n\n  - tx_vec is sized dmabuf-\u003esize / PAGE_SIZE, and\n    net_devmem_get_niov_at() only bounds-checks virt_addr \u003c dmabuf-\u003esize\n    before indexing tx_vec[virt_addr / PAGE_SIZE]. With size =\n    N*PAGE_SIZE + r (1 \u003c= r \u003c PAGE_SIZE), sendmsg() at iov_base =\n    N*PAGE_SIZE passes the bound check and reads tx_vec[N] -- one past.\n\n  - owner-\u003earea.num_niovs = len / PAGE_SIZE while gen_pool_add_owner()\n    covers the full byte len, so a non-page-multiple non-final sg\n    desyncs num_niovs from the gen_pool region for every later sg, on\n    both RX and TX.\n\ndma-buf does not require page-aligned sizes, so the bind path has to\nenforce what its own indexing assumes. Reject both with -EINVAL.\n\nThe size check is TX-only (only tx_vec is sized off dmabuf-\u003esize); the\nSG-length check covers both directions.",
  "id": "CVE-2026-64124",
  "modified": "2026-07-22T05:29:53.961067297Z",
  "published": "2026-07-19T15:40:21.879Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/134c517dfa63203287b2aad6558017f42435a02e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4eb82ba543421e9e38cc14e4e82058b78850df50"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5008e4e4ee6b739256b796702a7d1aae1b5c3b4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64124.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64124"
    },
    {
      "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:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "net: devmem: reject dma-buf bind with non-page-aligned size or SG length"
}