{"id":"CVE-2026-89881","revision":"47ad3c5c1260409ea9e554a0fb0e6fdb","records":[{"revision":"47ad3c5c1260409ea9e554a0fb0e6fdb","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89881","aliases":[],"title":"media: rtl2832_sdr: use vb2_video_unregister_device() on remove to fix DMA leak","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: rtl2832_sdr: use vb2_video_unregister_device() on remove to fix DMA leak\n\nrtl2832_sdr_remove() runs on USB disconnect and clears dev->udev to\nNULL before any pending streaming teardown has run. When user space\nlater closes its file descriptor, vb2 calls rtl2832_sdr_stop_streaming()\nwhich in turn calls rtl2832_sdr_free_stream_bufs(). That helper releases\neach coherent buffer with:\n\n    usb_free_coherent(dev->udev, dev->buf_size,\n                      dev->buf_list[dev->buf_num],\n                      dev->dma_addr[dev->buf_num]);\n\nusb_free_coherent() returns immediately when its dev argument is NULL,\nso every DMA stream buffer that was live at disconnect is silently\nleaked. The URBs allocated in rtl2832_sdr_alloc_urbs() outlive the\ndevice for the same reason.\n\nThe rtl2832_sdr driver uses vb2_fop_release() in its file_operations,\nso replace video_unregister_device(&dev->vdev) with\nvb2_video_unregister_device(&dev->vdev) and move it before clearing\ndev->udev. vb2_video_unregister_device() releases the vb2 queue, which\nsynchronously runs rtl2832_sdr_stop_streaming() if streaming is active,\nso URBs and coherent DMA stream buffers are freed while dev->udev is\nstill valid.\n\nvb2_video_unregister_device() locks vdev->queue->lock (vb_queue_lock)\ninternally, and stop_streaming() locks v4l2_lock, so the previous outer\nmutex_lock(&dev->vb_queue_lock) / mutex_lock(&dev->v4l2_lock) pair\naround the unregister sequence would self-deadlock and has been removed.\nA short v4l2_lock critical section around dev->udev = NULL remains so\nany ioctl path that still holds the file descriptor sees coherent state.\n\nIssue identified by automated review of the INV-003 series at\nhttps://sashiko.dev/","state":0,"publishedAt":"2026-09-16T10:31:46.966+00:00","modifiedAt":"2026-10-19T08:54:14.095+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/media/dvb-frontends/rtl2832_sdr.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"771138920eafa399f68d3492c8a75dfeea23474b\",\n                            \"lessThan\": \"234c46b95a032232e31fa5987b84fb8f87a9693b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"771138920eafa399f68d3492c8a75dfeea23474b\",\n                            \"lessThan\": \"034b6a4f9589c04bc3f2bd5125658cd72d3e17c8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"771138920eafa399f68d3492c8a75dfeea23474b\",\n                            \"lessThan\": \"0ef9f19010ae4ba93aca211ea8f0081b9bf7aab2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"771138920eafa399f68d3492c8a75dfeea23474b\",\n                            \"lessThan\": \"053581d4657c6b5289c5de71a4828d313c005189\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"771138920eafa399f68d3492c8a75dfeea23474b\",\n                            \"lessThan\": \"bbf15e83c37d9ac938b7c35c02b748fe54230010\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"771138920eafa399f68d3492c8a75dfeea23474b\",\n                            \"lessThan\": \"7443b16b6dd8889a3b9c5236a09e7c58f0d11dae\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"771138920eafa399f68d3492c8a75dfeea23474b\",\n                            \"lessThan\": \"a0d9d9a3b41a1346c26af57aade6ba3f552fa171\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"771138920eafa399f68d3492c8a75dfeea23474b\",\n                            \"lessThan\": \"dabb047c62668f280998e29117c55e41aabac336\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/media/dvb-frontends/rtl2832_sdr.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.15\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.15\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.51\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.5\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/234c46b95a032232e31fa5987b84fb8f87a9693b","https://git.kernel.org/stable/c/034b6a4f9589c04bc3f2bd5125658cd72d3e17c8","https://git.kernel.org/stable/c/0ef9f19010ae4ba93aca211ea8f0081b9bf7aab2","https://git.kernel.org/stable/c/053581d4657c6b5289c5de71a4828d313c005189","https://git.kernel.org/stable/c/bbf15e83c37d9ac938b7c35c02b748fe54230010","https://git.kernel.org/stable/c/7443b16b6dd8889a3b9c5236a09e7c58f0d11dae","https://git.kernel.org/stable/c/a0d9d9a3b41a1346c26af57aade6ba3f552fa171","https://git.kernel.org/stable/c/dabb047c62668f280998e29117c55e41aabac336"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89881","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89881","identifiers":["CVE-2026-89881"]},"retained":false,"historicalAffected":[]}],"coverage":[]}