{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-64427",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-19T15:36:31.787Z",
        "datePublished": "2026-07-25T08:51:04.686Z",
        "dateUpdated": "2026-08-19T16:28:13.596Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-19T16:28:13.596Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: logitech-dj: Fix maxfield check in DJ short report validation\n\nCommit b6a57912854e (\"HID: logitech-dj: Prevent REPORT_ID_DJ_SHORT\nrelated user initiated OOB write\") added validation for the DJ short\noutput report, but the error path dereferences rep->field[0] even when\nrep->maxfield is zero.\n\nCommit 8b9a097eb2fc (\"HID: logitech-dj: fix wrong detection of bad\nDJ_SHORT output report\") made the check conditional on rep being present,\nbut a crafted descriptor can still create report ID 0x20 with only padding\noutput items. hid-core registers the report, ignores the padding field,\nand leaves rep->maxfield as zero.\n\nIn that case the validation enters the rep->maxfield < 1 branch and then\ndereferences rep->field[0]->report_count while printing the error message,\ncausing a NULL pointer dereference during probe. This is reproducible with\nuhid by emulating a Logitech receiver with a padding-only DJ short output\nreport:\n\n  BUG: KASAN: null-ptr-deref in logi_dj_probe+0xb1/0x754 [hid_logitech_dj]\n  Read of size 4 at addr 0000000000000028 by task kworker/4:1/129\n  ...\n  Call Trace:\n   logi_dj_probe+0xb1/0x754 [hid_logitech_dj]\n   hid_device_probe+0x329/0x3f0 [hid]\n   really_probe+0x162/0x570\n   __device_attach+0x137/0x2c0\n   bus_probe_device+0x38/0xc0\n   device_add+0xa56/0xce0\n   hid_add_device+0x19c/0x280 [hid]\n   uhid_device_add_worker+0x2c/0xb0 [uhid]\n\nReject the zero-field report before printing the field report_count."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/hid/hid-logitech-dj.c"
                    ],
                    "versions": [
                        {
                            "version": "7754ade02d0fb1caf20392baf4e02937378fd136",
                            "lessThan": "f3790a6af9c7f47d454225cab9dc145270e48f62",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2ed9638cfbf9d49bdef9b0f5ee547236c2c2f500",
                            "lessThan": "1215febd644c3e16f77e0f1799d89544dd57a754",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "eeb5ad388595ca2b6624689198a057847f3a3e19",
                            "lessThan": "6f7f22a8d244c2e586b8eb61c7585784b62aea01",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "968e84f5c0dca4960580d174500e4bbf0c45dc15",
                            "lessThan": "95b3f23d632490b5eb285b9fcf7284f2ac8f9872",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ce2a731c179df8869e1969a1b2b5b9e4e1c25f8b",
                            "lessThan": "80c1e18473f63fd7c6a2bc9ad6f3d0a6cc4fb500",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "bc3bba4656ad280267ea78cf845ab6b1d95b9fcd",
                            "lessThan": "2b70bebc709489d29a31ac2935aeffb8d5228395",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b6a57912854e7ea36f3b270032661140cc4209cd",
                            "lessThan": "7a89ad762fad53d56b7002d7ffc923a4b7f4006f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b6a57912854e7ea36f3b270032661140cc4209cd",
                            "lessThan": "590cc4d782487632a52f37c2171bee1eeea29627",
                            "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/hid-logitech-dj.c"
                    ],
                    "versions": [
                        {
                            "version": "7.1",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "7.1",
                            "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": "7.1",
                                    "versionEndExcluding": "7.1.4"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "7.1",
                                    "versionEndExcluding": "7.2"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/f3790a6af9c7f47d454225cab9dc145270e48f62"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1215febd644c3e16f77e0f1799d89544dd57a754"
                },
                {
                    "url": "https://git.kernel.org/stable/c/6f7f22a8d244c2e586b8eb61c7585784b62aea01"
                },
                {
                    "url": "https://git.kernel.org/stable/c/95b3f23d632490b5eb285b9fcf7284f2ac8f9872"
                },
                {
                    "url": "https://git.kernel.org/stable/c/80c1e18473f63fd7c6a2bc9ad6f3d0a6cc4fb500"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2b70bebc709489d29a31ac2935aeffb8d5228395"
                },
                {
                    "url": "https://git.kernel.org/stable/c/7a89ad762fad53d56b7002d7ffc923a4b7f4006f"
                },
                {
                    "url": "https://git.kernel.org/stable/c/590cc4d782487632a52f37c2171bee1eeea29627"
                }
            ],
            "title": "HID: logitech-dj: Fix maxfield check in DJ short report validation",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}