CVE-2026-64427
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: HID: logitech-dj: Fix maxfield check in DJ short report validation Commit b6a57912854e ("HID: logitech-dj: Prevent REPORT_ID_DJ_SHORT related user initiated OOB write") added validation for the DJ short output report, but the error path dereferences rep->field[0] even when rep->maxfield is zero. Commit 8b9a097eb2fc ("HID: logitech-dj: fix wrong detection of bad DJ_SHORT output report") made the check conditional on rep being present, but a crafted descriptor can still create report ID 0x20 with only padding output items. hid-core registers the report, ignores the padding field, and leaves rep->maxfield as zero. In that case the validation enters the rep->maxfield < 1 branch and then dereferences rep->field[0]->report_count while printing the error message, causing a NULL pointer dereference during probe. This is reproducible with uhid by emulating a Logitech receiver with a padding-only DJ short output report: BUG: KASAN: null-ptr-deref in logi_dj_probe+0xb1/0x754 [hid_logitech_dj] Read of size 4 at addr 0000000000000028 by task kworker/4:1/129 ... Call Trace: logi_dj_probe+0xb1/0x754 [hid_logitech_dj] hid_device_probe+0x329/0x3f0 [hid] really_probe+0x162/0x570 __device_attach+0x137/0x2c0 bus_probe_device+0x38/0xc0 device_add+0xa56/0xce0 hid_add_device+0x19c/0x280 [hid] uhid_device_add_worker+0x2c/0xb0 [uhid] Reject the zero-field report before printing the field report_count.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-07-25 10:17:26.843000
Last modified
2026-11-06 17:18:54.190000
View original CVE JSON
{
"id": "CVE-2026-64427",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-07-25T10:17:26.843",
"lastModified": "2026-11-06T17:18:54.190",
"vulnStatus": "Analyzed",
"cveTags": [],
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{
"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."
}
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"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
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"description": [
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