media: rtl2832_sdr: release URBs and stream buffers on start_streaming() failure

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89880
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 11:16:56 UTC
Updated2026-09-16 15:18:14 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: media: rtl2832_sdr: release URBs and stream buffers on start_streaming() failure rtl2832_sdr_start_streaming() calls rtl2832_sdr_alloc_stream_bufs(), rtl2832_sdr_alloc_urbs() and rtl2832_sdr_submit_urbs() in sequence and shares a single err: label that only unlocks the mutex and returns. When alloc_urbs() succeeds but submit_urbs() fails, or when alloc_urbs() itself returns -ENOMEM after alloc_stream_bufs() has already succeeded, the URBs and/or the coherent DMA stream buffers stay allocated while streaming reports failure to vb2. Two latent defects follow on the next VIDIOC_STREAMON: 1) rtl2832_sdr_alloc_stream_bufs() unconditionally resets dev->buf_num to 0 and overwrites dev->buf_list[]/dev->dma_addr[], permanently leaking the coherent DMA memory allocated by the previous attempt. 2) rtl2832_sdr_alloc_urbs() never resets dev->urbs_initialized and only increments it. After a second successful pass urbs_initialized can exceed MAX_BULK_BUFS, so the subsequent rtl2832_sdr_free_urbs() walks from urbs_initialized - 1 down to 0 and reads past the end of dev->urb_list[], passing garbage pointers to usb_free_urb(). Mirror the teardown that stop_streaming() already performs: on the error path call rtl2832_sdr_free_urbs() and rtl2832_sdr_free_stream_bufs() before unlocking. Both helpers are idempotent (free_urbs kills and zeros urbs_initialized; free_stream_bufs is gated on URB_BUF and clears the buf_num counter), so partial-failure paths and the no-allocation paths remain safe. Issue identified by automated review of the INV-003 series at https://sashiko.dev/

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 771138920eafa399f68d3492c8a75dfeea23474b f14a713a36a5c87568430e9770896f2a8f5bbbb7 git Not specified
CNA Linux Linux affected 771138920eafa399f68d3492c8a75dfeea23474b c819dea3a433ae790b829443fdcc1715d1586560 git Not specified
CNA Linux Linux affected 771138920eafa399f68d3492c8a75dfeea23474b 0337ab0759285076a3f9dcfcc40906e69ab519b3 git Not specified
CNA Linux Linux affected 771138920eafa399f68d3492c8a75dfeea23474b c91e8ae2b39c6da81f26f2c9877d3fd33a4465ce git Not specified
CNA Linux Linux affected 771138920eafa399f68d3492c8a75dfeea23474b 8bcf11a239eac4e224ad856277de9a36c91b1711 git Not specified
CNA Linux Linux affected 771138920eafa399f68d3492c8a75dfeea23474b 26a2a985bbeee3eaa6f80ff7de732161a171ec9f git Not specified
CNA Linux Linux affected 771138920eafa399f68d3492c8a75dfeea23474b ac02b2c56ccef0788cea9b86990a8f349a3fc6d8 git Not specified
CNA Linux Linux affected 771138920eafa399f68d3492c8a75dfeea23474b fe50cdaebf12cd32ff9a44d92bfd6fbc2300dbd4 git Not specified
CNA Linux Linux affected 3.15 Not specified
CNA Linux Linux unaffected 3.15 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.5 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8bcf11a239eac4e224ad856277de9a36c91b1711 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/26a2a985bbeee3eaa6f80ff7de732161a171ec9f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fe50cdaebf12cd32ff9a44d92bfd6fbc2300dbd4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0337ab0759285076a3f9dcfcc40906e69ab519b3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ac02b2c56ccef0788cea9b86990a8f349a3fc6d8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c91e8ae2b39c6da81f26f2c9877d3fd33a4465ce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c819dea3a433ae790b829443fdcc1715d1586560 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f14a713a36a5c87568430e9770896f2a8f5bbbb7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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