{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "5e013ad206895e72d7da41bc1ae89d8cb499c3aa"
            },
            {
              "fixed": "ca899a926c11a59211b764b0155d9a1cdcc32b81"
            },
            {
              "fixed": "57bdd10ad50d68341f500a7b330f0d8949e510ec"
            },
            {
              "fixed": "6b3014ec0e9a390ca563030b2d7689921f0daef5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.15.0"
            },
            {
              "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-2026-64366.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: wacom: fix slab-out-of-bounds write in wacom_wac_queue_insert\n\nwacom_wac_queue_insert() calls kfifo_skip() in a loop when the kfifo\ndoesn't have enough space for the incoming report. If the kfifo is\nempty, kfifo_skip() reads stale data left in the kmalloc'd buffer\nvia __kfifo_peek_n() and interprets it as a record length, advancing\nfifo-\u003eout by that garbage value. This corrupts the internal kfifo\nstate, causing kfifo_unused() to return a value much larger than the\nactual buffer size, which bypasses __kfifo_in_r()'s guard:\n\n  if (len + recsize \u003e kfifo_unused(fifo))\n      return 0;\n\nkfifo_copy_in() then performs an out-of-bounds memcpy, writing up to\n3842 bytes past the 256-byte buffer.\n\nAdd a !kfifo_is_empty() condition to the while loop so kfifo_skip()\nis never called on an empty fifo, and check the return value of\nkfifo_in() to reject reports that are too large for the fifo.",
  "id": "CVE-2026-64366",
  "modified": "2026-07-28T03:56:09.841836828Z",
  "published": "2026-07-25T08:50:20.612Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/57bdd10ad50d68341f500a7b330f0d8949e510ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b3014ec0e9a390ca563030b2d7689921f0daef5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca899a926c11a59211b764b0155d9a1cdcc32b81"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64366.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64366"
    },
    {
      "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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "HID: wacom: fix slab-out-of-bounds write in wacom_wac_queue_insert"
}