{"cve":"CVE-2026-64427","nvd":{"published":"2026-07-25T10:17:26.843","modified":"2026-09-04T14:58:49.367","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/1215febd644c3e16f77e0f1799d89544dd57a754","https://git.kernel.org/stable/c/2b70bebc709489d29a31ac2935aeffb8d5228395","https://git.kernel.org/stable/c/590cc4d782487632a52f37c2171bee1eeea29627","https://git.kernel.org/stable/c/6f7f22a8d244c2e586b8eb61c7585784b62aea01","https://git.kernel.org/stable/c/7a89ad762fad53d56b7002d7ffc923a4b7f4006f"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:46:40.600842820+00:00"},"epss":{"cve":"CVE-2026-64427","score":0.00123,"percentile":0.02018,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}