media: rtl2832_sdr: use vb2_video_unregister_device() on remove to fix DMA leak
In the Linux kernel, the following vulnerability has been resolved: media: rtl2832_sdr: use vb2_video_unregister_device() on remove to fix DMA leak rtl2832_sdr_remove() runs on USB disconnect and clears dev->udev to NULL before any pending streaming teardown has run. When user space later closes its file descriptor, vb2 calls rtl2832_sdr_stop_streaming() which in turn calls rtl2832_sdr_free_stream_bufs(). That helper releases each coherent buffer with: usb_free_coherent(dev->udev, dev->buf_size, dev->buf_list[dev->buf_num], dev->dma_addr[dev->buf_num]); usb_free_coherent() returns immediately when its dev argument is NULL, so every DMA stream buffer that was live at disconnect is silently leaked. The URBs allocated in rtl2832_sdr_alloc_urbs() outlive the device for the same reason. The rtl2832_sdr driver uses vb2_fop_release() in its file_operations, so replace video_unregister_device(&dev->vdev) with vb2_video_unregister_device(&dev->vdev) and move it before clearing dev->udev. vb2_video_unregister_device() releases the vb2 queue, which synchronously runs rtl2832_sdr_stop_streaming() if streaming is active, so URBs and coherent DMA stream buffers are freed while dev->udev is still valid. vb2_video_unregister_device() locks vdev->queue->lock (vb_queue_lock) internally, and stop_streaming() locks v4l2_lock, so the previous outer mutex_lock(&dev->vb_queue_lock) / mutex_lock(&dev->v4l2_lock) pair around the unregister sequence would self-deadlock and has been removed. A short v4
CVE-2026-89881
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89881
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "771138920eafa399f68d3492c8a75dfeea23474b",
"lessThan": "234c46b95a032232e31fa5987b84fb8f87a9693b",
"versionType": "git"
},
{
"status": "affected",
"version": "771138920eafa399f68d3492c8a75dfeea23474b",
"lessThan": "034b6a4f9589c04bc3f2bd5125658cd72d3e17c8",
"versionType": "git"
},
{
"status": "affected",
"version": "771138920eafa399f68d3492c8a75dfeea23474b",
"lessThan": "0ef9f19010ae4ba93aca211ea8f0081b9bf7aab2",
"versionType": "git"
},
{
"status": "affected",
"version": "771138920eafa399f68d3492c8a75dfeea23474b",
"lessThan": "053581d4657c6b5289c5de71a4828d313c005189",
"versionType": "git"
},
{
"status": "affected",
"version": "771138920eafa399f68d3492c8a75dfeea23474b",
"lessThan": "bbf15e83c37d9ac938b7c35c02b748fe54230010",
"versionType": "git"
},
{
"status": "affected",
"version": "771138920eafa399f68d3492c8a75dfeea23474b",
"lessThan": "7443b16b6dd8889a3b9c5236a09e7c58f0d11dae",
"versionType": "git"
},
{
"status": "affected",
"version": "771138920eafa399f68d3492c8a75dfeea23474b",
"lessThan": "a0d9d9a3b41a1346c26af57aade6ba3f552fa171",
"versionType": "git"
},
{
"status": "affected",
"version": "771138920eafa399f68d3492c8a75dfeea23474b",
"lessThan": "dabb047c62668f280998e29117c55e41aabac336",
"versionType": "git"
}
],
"programFiles": [
"drivers/media/dvb-frontends/rtl2832_sdr.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/media/dvb-frontends/rtl2832_sdr.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89881
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #36333 · Revision 1
- Added to Heist Feed
- Publisher date