{"api_version":"1","generated_at":"2026-09-17T08:30:51+00:00","cve":"CVE-2026-89881","urls":{"html":"https://cve.report/CVE-2026-89881","api":"https://cve.report/api/cve/CVE-2026-89881.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89881","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89881"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-09-16 11:16:56","updated_at":"2026-09-16 11:16:56"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/053581d4657c6b5289c5de71a4828d313c005189","name":"https://git.kernel.org/stable/c/053581d4657c6b5289c5de71a4828d313c005189","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7443b16b6dd8889a3b9c5236a09e7c58f0d11dae","name":"https://git.kernel.org/stable/c/7443b16b6dd8889a3b9c5236a09e7c58f0d11dae","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/dabb047c62668f280998e29117c55e41aabac336","name":"https://git.kernel.org/stable/c/dabb047c62668f280998e29117c55e41aabac336","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/034b6a4f9589c04bc3f2bd5125658cd72d3e17c8","name":"https://git.kernel.org/stable/c/034b6a4f9589c04bc3f2bd5125658cd72d3e17c8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a0d9d9a3b41a1346c26af57aade6ba3f552fa171","name":"https://git.kernel.org/stable/c/a0d9d9a3b41a1346c26af57aade6ba3f552fa171","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bbf15e83c37d9ac938b7c35c02b748fe54230010","name":"https://git.kernel.org/stable/c/bbf15e83c37d9ac938b7c35c02b748fe54230010","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/234c46b95a032232e31fa5987b84fb8f87a9693b","name":"https://git.kernel.org/stable/c/234c46b95a032232e31fa5987b84fb8f87a9693b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0ef9f19010ae4ba93aca211ea8f0081b9bf7aab2","name":"https://git.kernel.org/stable/c/0ef9f19010ae4ba93aca211ea8f0081b9bf7aab2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89881","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89881","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 771138920eafa399f68d3492c8a75dfeea23474b 234c46b95a032232e31fa5987b84fb8f87a9693b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 771138920eafa399f68d3492c8a75dfeea23474b 034b6a4f9589c04bc3f2bd5125658cd72d3e17c8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 771138920eafa399f68d3492c8a75dfeea23474b 0ef9f19010ae4ba93aca211ea8f0081b9bf7aab2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 771138920eafa399f68d3492c8a75dfeea23474b 053581d4657c6b5289c5de71a4828d313c005189 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 771138920eafa399f68d3492c8a75dfeea23474b bbf15e83c37d9ac938b7c35c02b748fe54230010 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 771138920eafa399f68d3492c8a75dfeea23474b 7443b16b6dd8889a3b9c5236a09e7c58f0d11dae git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 771138920eafa399f68d3492c8a75dfeea23474b a0d9d9a3b41a1346c26af57aade6ba3f552fa171 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 771138920eafa399f68d3492c8a75dfeea23474b dabb047c62668f280998e29117c55e41aabac336 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.15","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.270 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.221 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.188 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.51 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.5 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/media/dvb-frontends/rtl2832_sdr.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"234c46b95a032232e31fa5987b84fb8f87a9693b","status":"affected","version":"771138920eafa399f68d3492c8a75dfeea23474b","versionType":"git"},{"lessThan":"034b6a4f9589c04bc3f2bd5125658cd72d3e17c8","status":"affected","version":"771138920eafa399f68d3492c8a75dfeea23474b","versionType":"git"},{"lessThan":"0ef9f19010ae4ba93aca211ea8f0081b9bf7aab2","status":"affected","version":"771138920eafa399f68d3492c8a75dfeea23474b","versionType":"git"},{"lessThan":"053581d4657c6b5289c5de71a4828d313c005189","status":"affected","version":"771138920eafa399f68d3492c8a75dfeea23474b","versionType":"git"},{"lessThan":"bbf15e83c37d9ac938b7c35c02b748fe54230010","status":"affected","version":"771138920eafa399f68d3492c8a75dfeea23474b","versionType":"git"},{"lessThan":"7443b16b6dd8889a3b9c5236a09e7c58f0d11dae","status":"affected","version":"771138920eafa399f68d3492c8a75dfeea23474b","versionType":"git"},{"lessThan":"a0d9d9a3b41a1346c26af57aade6ba3f552fa171","status":"affected","version":"771138920eafa399f68d3492c8a75dfeea23474b","versionType":"git"},{"lessThan":"dabb047c62668f280998e29117c55e41aabac336","status":"affected","version":"771138920eafa399f68d3492c8a75dfeea23474b","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/media/dvb-frontends/rtl2832_sdr.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.15"},{"lessThan":"3.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.270","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.221","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.188","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.157","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.51","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.270","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.221","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.188","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.51","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.5","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"3.15","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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/"}],"providerMetadata":{"dateUpdated":"2026-09-16T10:31:46.966Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/234c46b95a032232e31fa5987b84fb8f87a9693b"},{"url":"https://git.kernel.org/stable/c/034b6a4f9589c04bc3f2bd5125658cd72d3e17c8"},{"url":"https://git.kernel.org/stable/c/0ef9f19010ae4ba93aca211ea8f0081b9bf7aab2"},{"url":"https://git.kernel.org/stable/c/053581d4657c6b5289c5de71a4828d313c005189"},{"url":"https://git.kernel.org/stable/c/bbf15e83c37d9ac938b7c35c02b748fe54230010"},{"url":"https://git.kernel.org/stable/c/7443b16b6dd8889a3b9c5236a09e7c58f0d11dae"},{"url":"https://git.kernel.org/stable/c/a0d9d9a3b41a1346c26af57aade6ba3f552fa171"},{"url":"https://git.kernel.org/stable/c/dabb047c62668f280998e29117c55e41aabac336"}],"title":"media: rtl2832_sdr: use vb2_video_unregister_device() on remove to fix DMA leak","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89881","datePublished":"2026-09-16T10:31:46.966Z","dateReserved":"2026-09-11T19:38:34.772Z","dateUpdated":"2026-09-16T10:31:46.966Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-16 11:16:56","lastModifiedDate":"2026-09-16 11:16:56","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89881","Ordinal":"1","Title":"media: rtl2832_sdr: use vb2_video_unregister_device() on remove ","CVE":"CVE-2026-89881","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89881","Ordinal":"1","NoteData":"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/","Type":"Description","Title":"media: rtl2832_sdr: use vb2_video_unregister_device() on remove "}]}}}