{"id":"CVE-2026-89880","state":"PUBLISHED","title":"media: rtl2832_sdr: release URBs and stream buffers on start_streaming() failure","description":"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->buf_num\n   to 0 and overwrites dev->buf_list[]/dev->dma_addr[], permanently\n   leaking the coherent DMA memory allocated by the previous attempt.\n\n2) rtl2832_sdr_alloc_urbs() never resets dev->urbs_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->urb_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/","publishedAt":"2026-09-16T10:31:46.260Z","updatedAt":"2026-10-19T08:54:13.058Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"771138920eafa399f68d3492c8a75dfeea23474b","status":"affected","lessThan":"f14a713a36a5c87568430e9770896f2a8f5bbbb7","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","status":"affected","lessThan":"c819dea3a433ae790b829443fdcc1715d1586560","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","status":"affected","lessThan":"0337ab0759285076a3f9dcfcc40906e69ab519b3","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","status":"affected","lessThan":"c91e8ae2b39c6da81f26f2c9877d3fd33a4465ce","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","status":"affected","lessThan":"8bcf11a239eac4e224ad856277de9a36c91b1711","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","status":"affected","lessThan":"26a2a985bbeee3eaa6f80ff7de732161a171ec9f","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","status":"affected","lessThan":"ac02b2c56ccef0788cea9b86990a8f349a3fc6d8","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","status":"affected","lessThan":"fe50cdaebf12cd32ff9a44d92bfd6fbc2300dbd4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/dvb-frontends/rtl2832_sdr.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.15","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/dvb-frontends/rtl2832_sdr.c"]}],"references":["https://git.kernel.org/stable/c/f14a713a36a5c87568430e9770896f2a8f5bbbb7","https://git.kernel.org/stable/c/c819dea3a433ae790b829443fdcc1715d1586560","https://git.kernel.org/stable/c/0337ab0759285076a3f9dcfcc40906e69ab519b3","https://git.kernel.org/stable/c/c91e8ae2b39c6da81f26f2c9877d3fd33a4465ce","https://git.kernel.org/stable/c/8bcf11a239eac4e224ad856277de9a36c91b1711","https://git.kernel.org/stable/c/26a2a985bbeee3eaa6f80ff7de732161a171ec9f","https://git.kernel.org/stable/c/ac02b2c56ccef0788cea9b86990a8f349a3fc6d8","https://git.kernel.org/stable/c/fe50cdaebf12cd32ff9a44d92bfd6fbc2300dbd4"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89880.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89880","state":"PUBLISHED","datePublished":"2026-09-16T10:31:46.260Z","dateUpdated":"2026-10-19T08:54:13.058Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.772Z"},"containers":{"cna":{"title":"media: rtl2832_sdr: release URBs and stream buffers on start_streaming() failure","descriptions":[{"lang":"en","value":"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->buf_num\n   to 0 and overwrites dev->buf_list[]/dev->dma_addr[], permanently\n   leaking the coherent DMA memory allocated by the previous attempt.\n\n2) rtl2832_sdr_alloc_urbs() never resets dev->urbs_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->urb_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/"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"771138920eafa399f68d3492c8a75dfeea23474b","status":"affected","lessThan":"f14a713a36a5c87568430e9770896f2a8f5bbbb7","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","status":"affected","lessThan":"c819dea3a433ae790b829443fdcc1715d1586560","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","status":"affected","lessThan":"0337ab0759285076a3f9dcfcc40906e69ab519b3","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","status":"affected","lessThan":"c91e8ae2b39c6da81f26f2c9877d3fd33a4465ce","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","status":"affected","lessThan":"8bcf11a239eac4e224ad856277de9a36c91b1711","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","status":"affected","lessThan":"26a2a985bbeee3eaa6f80ff7de732161a171ec9f","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","status":"affected","lessThan":"ac02b2c56ccef0788cea9b86990a8f349a3fc6d8","versionType":"git"},{"version":"771138920eafa399f68d3492c8a75dfeea23474b","status":"affected","lessThan":"fe50cdaebf12cd32ff9a44d92bfd6fbc2300dbd4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/dvb-frontends/rtl2832_sdr.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.15","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/dvb-frontends/rtl2832_sdr.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/f14a713a36a5c87568430e9770896f2a8f5bbbb7"},{"url":"https://git.kernel.org/stable/c/c819dea3a433ae790b829443fdcc1715d1586560"},{"url":"https://git.kernel.org/stable/c/0337ab0759285076a3f9dcfcc40906e69ab519b3"},{"url":"https://git.kernel.org/stable/c/c91e8ae2b39c6da81f26f2c9877d3fd33a4465ce"},{"url":"https://git.kernel.org/stable/c/8bcf11a239eac4e224ad856277de9a36c91b1711"},{"url":"https://git.kernel.org/stable/c/26a2a985bbeee3eaa6f80ff7de732161a171ec9f"},{"url":"https://git.kernel.org/stable/c/ac02b2c56ccef0788cea9b86990a8f349a3fc6d8"},{"url":"https://git.kernel.org/stable/c/fe50cdaebf12cd32ff9a44d92bfd6fbc2300dbd4"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The flaw is reached only through local V4L2 ioctls (VIDIOC_REQBUFS, VIDIOC_QBUF, VIDIOC_STREAMON) on the rtl2832_sdr /dev/swradioN node; USB bulk packets from the dongle never enter this start_streaming() error path.\nAC:L - The attacker drives both STREAMON attempts and can force the first submit_urbs() failure via USBDEVFS_RESET/DISCONNECT on the matching usbfs node or GFP_KERNEL memory pressure, then retry STREAMON; no race or layout outside their control is required.\nPR:L - v4l2_fh_open() and vb2_ioctl_streamon() perform no capability checks; only the SDR device node is needed, and udev uaccess/video-group rules grant it to unprivileged seat users on desktops, Android, and embedded RTL-SDR systems.\nUI:N - The attacking process issues REQBUFS/QBUF/STREAMON (and any usbfs reset) on its own file descriptors against an already-attached RTL2832; no separate victim action such as plugging in the dongle or opening a file is required.\nS:U - The urb_list[] overrun, leaked coherent DMA buffers, and resulting usb_submit_urb()/usb_free_urb() misuse stay in host kernel memory in the same OS security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - After a failed STREAMON, a second alloc_urbs() leaves urbs_initialized above MAX_BULK_BUFS, so submit_urbs()/free_urbs() read past urb_list[] and treat adjacent kernel fields (including live buf_list[] DMA pointers) as struct urb objects, an out-of-bounds/type-confused kernel read.\nI:H - usb_submit_urb() writes urb->ep/status/transfer_flags through those OOB-derived pointers, and the subsequent free_urbs() walk passes the same garbage to usb_free_urb()/kref_put, a type-confusion/slab-corruption write primitive suitable for control-flow hijack.\nA:H - usb_submit_urb() of the first out-of-bounds slot oopses the kernel (near-NULL from buf_num), and the attacker can repeat STREAMON after a forced submit failure to panic or hang the host at will."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:54:13.058Z"},"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}