media: rtl2832_sdr: release URBs and stream buffers on start_streaming() failure
In 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
CVE-2026-89880
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-2026-89880
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": "f14a713a36a5c87568430e9770896f2a8f5bbbb7",
"versionType": "git"
},
{
"status": "affected",
"version": "771138920eafa399f68d3492c8a75dfeea23474b",
"lessThan": "c819dea3a433ae790b829443fdcc1715d1586560",
"versionType": "git"
},
{
"status": "affected",
"version": "771138920eafa399f68d3492c8a75dfeea23474b",
"lessThan": "0337ab0759285076a3f9dcfcc40906e69ab519b3",
"versionType": "git"
},
{
"status": "affected",
"version": "771138920eafa399f68d3492c8a75dfeea23474b",
"lessThan": "c91e8ae2b39c6da81f26f2c9877d3fd33a4465ce",
"versionType": "git"
},
{
"status": "affected",
"version": "771138920eafa399f68d3492c8a75dfeea23474b",
"lessThan": "8bcf11a239eac4e224ad856277de9a36c91b1711",
"versionType": "git"
},
{
"status": "affected",
"version": "771138920eafa399f68d3492c8a75dfeea23474b",
"lessThan": "26a2a985bbeee3eaa6f80ff7de732161a171ec9f",
"versionType": "git"
},
{
"status": "affected",
"version": "771138920eafa399f68d3492c8a75dfeea23474b",
"lessThan": "ac02b2c56ccef0788cea9b86990a8f349a3fc6d8",
"versionType": "git"
},
{
"status": "affected",
"version": "771138920eafa399f68d3492c8a75dfeea23474b",
"lessThan": "fe50cdaebf12cd32ff9a44d92bfd6fbc2300dbd4",
"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-2026-89880
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #36330 · Revision 1
- Added to Heist Feed
- Publisher date