ALSA: bcd2000: clear the URB pointers on disconnect
In the Linux kernel, the following vulnerability has been resolved: ALSA: bcd2000: clear the URB pointers on disconnect bcd2000_free_usb_related_resources() frees both URBs and leaves the pointers behind: usb_kill_urb(bcd2k->midi_out_urb); usb_kill_urb(bcd2k->midi_in_urb); usb_free_urb(bcd2k->midi_out_urb); usb_free_urb(bcd2k->midi_in_urb); The rawmidi device outlives that call. A substream that is still open when the device is unplugged reaches bcd2000_midi_send() from the trigger path on close. That function writes to the freed URB and then hands it to the USB core: bcd2k->midi_out_urb->transfer_buffer_length = BUFSIZE; ... ret = usb_submit_urb(bcd2k->midi_out_urb, GFP_ATOMIC); usb_kill_urb() does not stop a later submission either, so a submit that races the disconnect can requeue the URB after it has been reaped. midi_in_urb is exposed the same way: bcd2000_input_complete() resubmits it from the completion handler. KASAN on 7.2.0-rc5 (arm64): BUG: KASAN: slab-use-after-free in bcd2000_midi_send [snd_bcd2000] Write of size 4 at addr ffff00001827d388 by task bpoc/168 __asan_store4 bcd2000_midi_send [snd_bcd2000] bcd2000_midi_output_trigger [snd_bcd2000] snd_rawmidi_kernel_write1 close_substream.part.0 Freed by task 168: usb_free_urb bcd2000_disconnect [snd_bcd2000] BUG: KASAN: slab-use-after-free in usb_submit_urb Read of size 8 at addr ffff00001827d3b8 by task bpoc/168 Clear both pointers after freeing and test them on the paths that can still run. Poison the URBs before f
CVE-2026-80971
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-2026-80971
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": "b47a22290d581277be70e8a597824a4985d39e83",
"lessThan": "9af08677aa57debaca5b57c8045c52a83d3dd376",
"versionType": "git"
},
{
"status": "affected",
"version": "b47a22290d581277be70e8a597824a4985d39e83",
"lessThan": "5a77febac6faf6da40fbb4555f703eeb91b58130",
"versionType": "git"
},
{
"status": "affected",
"version": "b47a22290d581277be70e8a597824a4985d39e83",
"lessThan": "3c00004f134fc819f9d9e202c6a64acde0a1f8d0",
"versionType": "git"
},
{
"status": "affected",
"version": "b47a22290d581277be70e8a597824a4985d39e83",
"lessThan": "6c07aad8a7c9ef8ebc4d03a964b882123a349a2e",
"versionType": "git"
},
{
"status": "affected",
"version": "b47a22290d581277be70e8a597824a4985d39e83",
"lessThan": "eb482a06791d6168beb8c78cc904ac5a5ed96a55",
"versionType": "git"
},
{
"status": "affected",
"version": "b47a22290d581277be70e8a597824a4985d39e83",
"lessThan": "7df3194bdb7479cad9199889655a566a2c0c1d1b",
"versionType": "git"
},
{
"status": "affected",
"version": "b47a22290d581277be70e8a597824a4985d39e83",
"lessThan": "b06ebc7fe25a6af4a9f6e4a3d4236a4178ad4b01",
"versionType": "git"
},
{
"status": "affected",
"version": "b47a22290d581277be70e8a597824a4985d39e83",
"lessThan": "459d3a64766f5ca2f1886daeaf24582831a5f5ab",
"versionType": "git"
}
],
"programFiles": [
"sound/usb/bcd2000/bcd2000.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.16",
"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": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"sound/usb/bcd2000/bcd2000.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80971
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #34929 · Revision 1
- Added to Heist Feed
- Publisher date