{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-64366",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-19T15:36:31.783Z",
        "datePublished": "2026-07-25T08:50:20.612Z",
        "dateUpdated": "2026-08-17T04:54:14.203Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-17T04:54:14.203Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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->out 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 > 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."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 8.8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:A - The Wacom driver accepts Bluetooth HID devices, whose attacker-controlled descriptors and reports reach wacom_raw_event through HIDP or UHID. A malicious peripheral within Bluetooth range can therefore trigger the flaw.\nAC:L - A single oversized crafted report can deterministically corrupt the empty FIFO state and trigger the overwrite. No race or condition outside the attacker's control is required.\nPR:N - A connected malicious Bluetooth peripheral needs no account or kernel capability on the target. The report-processing path contains no privilege or authentication check.\nUI:N - Once the malicious peripheral is connected, it can transmit the triggering report without any concurrent victim action.\nS:U - The corruption occurs inside the host kernel and compromises resources governed by that same security authority; it does not inherently cross a VM or IOMMU boundary.\nC:H - The large attacker-controlled heap overwrite can corrupt adjacent kernel objects and be developed into code-execution or arbitrary-memory-access primitives, exposing kernel and process memory.\nI:H - The report supplies thousands of attacker-controlled bytes beyond a small slab object, enabling corruption of adjacent objects and potential kernel control-flow hijacking.\nA:H - The extensive slab overwrite can immediately cause a kernel oops or panic, and the triggering report can be sent repeatedly."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/hid/wacom_sys.c"
                    ],
                    "versions": [
                        {
                            "version": "5e013ad206895e72d7da41bc1ae89d8cb499c3aa",
                            "lessThan": "ca899a926c11a59211b764b0155d9a1cdcc32b81",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5e013ad206895e72d7da41bc1ae89d8cb499c3aa",
                            "lessThan": "57bdd10ad50d68341f500a7b330f0d8949e510ec",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5e013ad206895e72d7da41bc1ae89d8cb499c3aa",
                            "lessThan": "6b3014ec0e9a390ca563030b2d7689921f0daef5",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/hid/wacom_sys.c"
                    ],
                    "versions": [
                        {
                            "version": "6.15",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.15",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.39",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.4",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.15",
                                    "versionEndExcluding": "6.18.39"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.15",
                                    "versionEndExcluding": "7.1.4"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.15",
                                    "versionEndExcluding": "7.2"
                                }
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/ca899a926c11a59211b764b0155d9a1cdcc32b81"
                },
                {
                    "url": "https://git.kernel.org/stable/c/57bdd10ad50d68341f500a7b330f0d8949e510ec"
                },
                {
                    "url": "https://git.kernel.org/stable/c/6b3014ec0e9a390ca563030b2d7689921f0daef5"
                }
            ],
            "title": "HID: wacom: fix slab-out-of-bounds write in wacom_wac_queue_insert",
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