{ "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": "2026-10-19T08:54:14.095Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:54:14.095Z" }, "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", "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" } ] } ] } ], "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" } } } }