{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89881","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-11T19:38:34.772Z","datePublished":"2026-09-16T10:31:46.966Z","dateUpdated":"2026-09-16T10:31:46.966Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-16T10:31:46.966Z"},"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/"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/dvb-frontends/rtl2832_sdr.c"],"versions":[{"version":"771138920eafa399f68d3492c8a75dfeea23474b","lessThan":"234c46b95a032232e31fa5987b84fb8f87a9693b","status":"affected","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","lessThan":"034b6a4f9589c04bc3f2bd5125658cd72d3e17c8","status":"affected","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","lessThan":"0ef9f19010ae4ba93aca211ea8f0081b9bf7aab2","status":"affected","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","lessThan":"053581d4657c6b5289c5de71a4828d313c005189","status":"affected","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","lessThan":"bbf15e83c37d9ac938b7c35c02b748fe54230010","status":"affected","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","lessThan":"7443b16b6dd8889a3b9c5236a09e7c58f0d11dae","status":"affected","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","lessThan":"a0d9d9a3b41a1346c26af57aade6ba3f552fa171","status":"affected","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","lessThan":"dabb047c62668f280998e29117c55e41aabac336","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/dvb-frontends/rtl2832_sdr.c"],"versions":[{"version":"3.15","status":"affected"},{"version":"0","lessThan":"3.15","status":"unaffected","versionType":"semver"},{"version":"5.10.270","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.221","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.188","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.157","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.110","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.51","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.5","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.18.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"7.2.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"7.3-rc1"}]}]}],"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"}}}}