{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "7b07a2a7ca02a20124b552be96c5a56910795488"
            },
            {
              "fixed": "b7475b2dce5e121e687280ba5732ccefe77ffd2f"
            },
            {
              "fixed": "e086c16962a1b0142e2675610e9c06fcfcd4c3a8"
            },
            {
              "fixed": "0cae3d6109427c455bad0a18dfb3e2a91657e38a"
            },
            {
              "fixed": "baa6b6068a3f2bf2ed525a1cb37975905dadc658"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.9.0"
            },
            {
              "fixed": "6.12.96"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.39"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64328.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Fix DMA fence leak\n\nIn ffs_dmabuf_transfer(), a ffs_dma_fence object is kmalloc'd, with the\nunderlying dma_fence later initialized by dma_fence_init(), which sets\nits kref counter to 1. Then, dma_resv_add_fence() gets a second\nreference, and a pointer to the ffs_dma_fence is passed as the\nusb_request's \"context\" field.\n\nThe dma-resv mechanism will manage the second reference, but the first\nreference is never properly released; the ffs_dmabuf_cleanup() function\ndecreases the reference count, but only to balance with the reference\ngrab in ffs_dmabuf_signal_done().\n\nThe code will then slowly leak memory as more ffs_dma_fence objects are\ncreated without being ever freed.\n\nAddress this issue by transferring ownership of the fence to the DMA\nreservation object, by calling dma_fence_put() right after\ndma_resv_add_fence(). The ffs_dma_fence then gets properly discarded\nafter being signalled.",
  "id": "CVE-2026-64328",
  "modified": "2026-07-27T03:56:26.793680682Z",
  "published": "2026-07-25T08:49:56.340Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0cae3d6109427c455bad0a18dfb3e2a91657e38a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b7475b2dce5e121e687280ba5732ccefe77ffd2f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/baa6b6068a3f2bf2ed525a1cb37975905dadc658"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e086c16962a1b0142e2675610e9c06fcfcd4c3a8"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64328.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64328"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "usb: gadget: f_fs: Fix DMA fence leak"
}