{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89880", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.772Z", "datePublished": "2026-09-16T10:31:46.260Z", "dateUpdated": "2026-10-19T08:54:13.058Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:54:13.058Z" }, "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/" } ], "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." } ] } ], "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": "f14a713a36a5c87568430e9770896f2a8f5bbbb7", "status": "affected", "versionType": "git" }, { "version": "771138920eafa399f68d3492c8a75dfeea23474b", "lessThan": "c819dea3a433ae790b829443fdcc1715d1586560", "status": "affected", "versionType": "git" }, { "version": "771138920eafa399f68d3492c8a75dfeea23474b", "lessThan": "0337ab0759285076a3f9dcfcc40906e69ab519b3", "status": "affected", "versionType": "git" }, { "version": "771138920eafa399f68d3492c8a75dfeea23474b", "lessThan": "c91e8ae2b39c6da81f26f2c9877d3fd33a4465ce", "status": "affected", "versionType": "git" }, { "version": "771138920eafa399f68d3492c8a75dfeea23474b", "lessThan": "8bcf11a239eac4e224ad856277de9a36c91b1711", "status": "affected", "versionType": "git" }, { "version": "771138920eafa399f68d3492c8a75dfeea23474b", "lessThan": "26a2a985bbeee3eaa6f80ff7de732161a171ec9f", "status": "affected", "versionType": "git" }, { "version": "771138920eafa399f68d3492c8a75dfeea23474b", "lessThan": "ac02b2c56ccef0788cea9b86990a8f349a3fc6d8", "status": "affected", "versionType": "git" }, { "version": "771138920eafa399f68d3492c8a75dfeea23474b", "lessThan": "fe50cdaebf12cd32ff9a44d92bfd6fbc2300dbd4", "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/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" } ], "title": "media: rtl2832_sdr: release URBs and stream buffers on start_streaming() failure", "x_generator": { "engine": "bippy-1.2.0" } } } }