{"id":"CVE-2026-89880","summary":"media: rtl2832_sdr: release URBs and stream buffers on start_streaming() failure","details":"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-\u003ebuf_num\n   to 0 and overwrites dev-\u003ebuf_list[]/dev-\u003edma_addr[], permanently\n   leaking the coherent DMA memory allocated by the previous attempt.\n\n2) rtl2832_sdr_alloc_urbs() never resets dev-\u003eurbs_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-\u003eurb_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/","modified":"2026-09-18T03:48:33.763507469Z","published":"2026-09-16T10:31:46.260Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89880.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0337ab0759285076a3f9dcfcc40906e69ab519b3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/26a2a985bbeee3eaa6f80ff7de732161a171ec9f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8bcf11a239eac4e224ad856277de9a36c91b1711"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ac02b2c56ccef0788cea9b86990a8f349a3fc6d8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c819dea3a433ae790b829443fdcc1715d1586560"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c91e8ae2b39c6da81f26f2c9877d3fd33a4465ce"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f14a713a36a5c87568430e9770896f2a8f5bbbb7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fe50cdaebf12cd32ff9a44d92bfd6fbc2300dbd4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89880.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89880"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"771138920eafa399f68d3492c8a75dfeea23474b"},{"fixed":"f14a713a36a5c87568430e9770896f2a8f5bbbb7"},{"fixed":"c819dea3a433ae790b829443fdcc1715d1586560"},{"fixed":"0337ab0759285076a3f9dcfcc40906e69ab519b3"},{"fixed":"c91e8ae2b39c6da81f26f2c9877d3fd33a4465ce"},{"fixed":"8bcf11a239eac4e224ad856277de9a36c91b1711"},{"fixed":"26a2a985bbeee3eaa6f80ff7de732161a171ec9f"},{"fixed":"ac02b2c56ccef0788cea9b86990a8f349a3fc6d8"},{"fixed":"fe50cdaebf12cd32ff9a44d92bfd6fbc2300dbd4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89880.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.15.0"},{"fixed":"5.10.270"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.221"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.188"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.157"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.51"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89880.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}