{"schema_version":"1.9.0","id":"CVE-2026-64427","published":"2026-07-25T08:51:04.686Z","modified":"2026-09-06T03:30:43.921355854Z","related":["openSUSE-SU-2026:11476-1"],"summary":"HID: logitech-dj: Fix maxfield check in DJ short report validation","details":"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":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"7754ade02d0fb1caf20392baf4e02937378fd136"},{"fixed":"f3790a6af9c7f47d454225cab9dc145270e48f62"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"2ed9638cfbf9d49bdef9b0f5ee547236c2c2f500"},{"fixed":"1215febd644c3e16f77e0f1799d89544dd57a754"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"eeb5ad388595ca2b6624689198a057847f3a3e19"},{"fixed":"6f7f22a8d244c2e586b8eb61c7585784b62aea01"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"968e84f5c0dca4960580d174500e4bbf0c45dc15"},{"fixed":"95b3f23d632490b5eb285b9fcf7284f2ac8f9872"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ce2a731c179df8869e1969a1b2b5b9e4e1c25f8b"},{"fixed":"80c1e18473f63fd7c6a2bc9ad6f3d0a6cc4fb500"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"bc3bba4656ad280267ea78cf845ab6b1d95b9fcd"},{"fixed":"2b70bebc709489d29a31ac2935aeffb8d5228395"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b6a57912854e7ea36f3b270032661140cc4209cd"},{"fixed":"7a89ad762fad53d56b7002d7ffc923a4b7f4006f"},{"fixed":"590cc4d782487632a52f37c2171bee1eeea29627"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64427.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.1.0"},{"fixed":"7.1.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64427.json"}}],"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1215febd644c3e16f77e0f1799d89544dd57a754"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2b70bebc709489d29a31ac2935aeffb8d5228395"},{"type":"WEB","url":"https://git.kernel.org/stable/c/590cc4d782487632a52f37c2171bee1eeea29627"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6f7f22a8d244c2e586b8eb61c7585784b62aea01"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7a89ad762fad53d56b7002d7ffc923a4b7f4006f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/80c1e18473f63fd7c6a2bc9ad6f3d0a6cc4fb500"},{"type":"WEB","url":"https://git.kernel.org/stable/c/95b3f23d632490b5eb285b9fcf7284f2ac8f9872"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f3790a6af9c7f47d454225cab9dc145270e48f62"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64427.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64427"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64427.json"}}