dma-buf: fix UAF in dma_buf_fd() tracepoint

{
  "id": "5d870429c06ba8f88fcdefdd4b0ff7173565a607eb35c3483cfc10e82da520be",
  "url": "https://osv.dev/vulnerability/CVE-2026-63910",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "dma-buf: fix UAF in dma_buf_fd() tracepoint",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: dma-buf: fix UAF in dma_buf_fd() tracepoint Once FD_ADD() returns, the fd is live in the file descriptor table and a thread sharing that table can close() it before DMA_BUF_TRACE() runs. The close drops the last reference, __fput() frees the dma_buf, and the tracepoint then dereferences dmabuf to take dmabuf->name_lock -- slab-use-after-free. Split FD_ADD() back into get_unused_fd_flags() + fd_install() and emit the tracepoint between them. While the fdtable slot is reserved with a NULL file pointer, a racing close() returns -EBADF without entering __fput(), so the dma_buf stays alive across the trace. Same approach as commit 2d76319c4cbb (\"dma-buf: fix UAF in dma_buf_put() tracepoint\"). This undoes the FD_ADD() conversion done in commit 34dfce523c90 (\"dma: convert dma_buf_fd() to FD_ADD()\"); FD_ADD() has no place to hook the tracepoint safely.",
    "evidence": "osv:CVE-2026-63910",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.0.12",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-63910",
      "aliases": [
        "CVE-2026-63910"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "281a226314238e8adb08d11b765347687ffb38b9"
                },
                {
                  "fixed": "b569f86e2f8dbf6f11d31d3de794d22e18098b23"
                },
                {
                  "fixed": "ead6680f354f83966c796fc7f9463a3171789616"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63910.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "7.0.0"
                },
                {
                  "fixed": "7.0.12"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63910.json"
          }
        }
      ],
      "modified": "2026-11-01T02:30:52.185561884Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/b569f86e2f8dbf6f11d31d3de794d22e18098b23",
        "https://git.kernel.org/stable/c/ead6680f354f83966c796fc7f9463a3171789616",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63910.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-63910",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63910.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-63910",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521383,
  "published_at": "2026-07-19T14:55:15.77+00:00"
}