{"schemaVersion":3,"id":"CVE-2021-47269","aliases":["UBUNTU-CVE-2021-47269","DEBIAN-CVE-2021-47269"],"status":"published","duplicateOf":null,"title":null,"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: dwc3: ep0: fix NULL pointer exception\n\nThere is no validation of the index from dwc3_wIndex_to_dep() and we might\nbe referring a non-existing ep and trigger a NULL pointer exception. In\ncertain configurations we might use fewer eps and the index might wrongly\nindicate a larger ep index than existing.\n\nBy adding this validation from the patch we can actually report a wrong\nindex back to the caller.\n\nIn our usecase we are using a composite device on an older kernel, but\nupstream might use this fix also. Unfortunately, I cannot describe the\nhardware for others to reproduce the issue as it is a proprietary\nimplementation.\n\n[   82.958261] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000a4\n[   82.966891] Mem abort info:\n[   82.969663]   ESR = 0x96000006\n[   82.972703]   Exception class = DABT (current EL), IL = 32 bits\n[   82.978603]   SET = 0, FnV = 0\n[   82.981642]   EA = 0, S1PTW = 0\n[   82.984765] Data abort info:\n[   82.987631]   ISV = 0, ISS = 0x00000006\n[   82.991449]   CM = 0, WnR = 0\n[   82.994409] user pgtable: 4k pages, 39-bit VAs, pgdp = 00000000c6210ccc\n[   83.000999] [00000000000000a4] pgd=0000000053aa5003, pud=0000000053aa5003, pmd=0000000000000000\n[   83.009685] Internal error: Oops: 96000006 [#1] PREEMPT SMP\n[   83.026433] Process irq/62-dwc3 (pid: 303, stack limit = 0x000000003985154c)\n[   83.033470] CPU: 0 PID: 303 Comm: irq/62-dwc3 Not tainted 4.19.124 #1\n[   83.044836] pstate: 60000085 (nZCv daIf -PAN -UAO)\n[   83.049628] pc : dwc3_ep0_handle_feature+0x414/0x43c\n[   83.054558] lr : dwc3_ep0_interrupt+0x3b4/0xc94\n\n...\n\n[   83.141788] Call trace:\n[   83.144227]  dwc3_ep0_handle_feature+0x414/0x43c\n[   83.148823]  dwc3_ep0_interrupt+0x3b4/0xc94\n[   83.181546] ---[ end trace aac6b5267d84c32f ]---","dates":{"published":"2024-05-21T14:19:59.207Z","modified":"2026-05-11T13:51:14.532Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.5,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":5.5,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","exploitability":4.6,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · 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