{"cve":"CVE-2026-89880","nvd":{"published":"2026-09-16T11:16:56.363","modified":"2026-10-19T09:18:32.850","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: rtl2832_sdr: release URBs and stream buffers on start_streaming() failure\n\nrtl2832_sdr_start_streaming() calls rtl2832_sdr_alloc_stream_bufs(),\nrtl2832_sdr_alloc_urbs() and rtl2832_sdr_submit_urbs() in sequence and\nshares a single err: label that only unlocks the mutex and returns.\nWhen alloc_urbs() succeeds but submit_urbs() fails, or when alloc_urbs()\nitself returns -ENOMEM after alloc_stream_bufs() has already succeeded,\nthe URBs and/or the coherent DMA stream buffers stay allocated while\nstreaming reports failure to vb2. Two latent defects follow on the next\nVIDIOC_STREAMON:\n\n1) rtl2832_sdr_alloc_stream_bufs() unconditionally resets dev->buf_num\n   to 0 and overwrites dev->buf_list[]/dev->dma_addr[], permanently\n   leaking the coherent DMA memory allocated by the previous attempt.\n\n2) rtl2832_sdr_alloc_urbs() never resets dev->urbs_initialized and only\n   increments it. After a second successful pass urbs_initialized can\n   exceed MAX_BULK_BUFS, so the subsequent rtl2832_sdr_free_urbs() walks\n   from urbs_initialized - 1 down to 0 and reads past the end of\n   dev->urb_list[], passing garbage pointers to usb_free_urb().\n\nMirror the teardown that stop_streaming() already performs: on the error\npath call rtl2832_sdr_free_urbs() and rtl2832_sdr_free_stream_bufs()\nbefore unlocking. Both helpers are idempotent (free_urbs kills and zeros\nurbs_initialized; free_stream_bufs is gated on URB_BUF and clears the\nbuf_num counter), so partial-failure paths and the no-allocation paths\nremain safe.\n\nIssue identified by automated review of the INV-003 series at\nhttps://sashiko.dev/","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":[],"references":["https://git.kernel.org/stable/c/0337ab0759285076a3f9dcfcc40906e69ab519b3","https://git.kernel.org/stable/c/26a2a985bbeee3eaa6f80ff7de732161a171ec9f","https://git.kernel.org/stable/c/8bcf11a239eac4e224ad856277de9a36c91b1711","https://git.kernel.org/stable/c/ac02b2c56ccef0788cea9b86990a8f349a3fc6d8","https://git.kernel.org/stable/c/c819dea3a433ae790b829443fdcc1715d1586560"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:54:41.405518556+00:00"},"epss":{"cve":"CVE-2026-89880","score":0.00169,"percentile":0.06187,"date":"2026-10-25"},"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."]}