ALSA: usb-audio: Add sanity check for OOB writes at silencing

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Summary

CVECVE-2026-43279
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 12:16:49 UTC
Updated2026-05-08 19:02:38 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Add sanity check for OOB writes at silencing At silencing the playback URB packets in the implicit fb mode before the actual playback, we blindly assume that the received packets fit with the buffer size. But when the setup in the capture stream differs from the playback stream (e.g. due to the USB core limitation of max packet size), such an inconsistency may lead to OOB writes to the buffer, resulting in a crash. For addressing it, add a sanity check of the transfer buffer size at prepare_silent_urb(), and stop the data copy if the received data overflows. Also, report back the transfer error properly from there, too. Note that this doesn't fix the root cause of the playback error itself, but this merely covers the kernel Oops.

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

EPSS: 0.000130000 probability, percentile 0.024500000 (date 2026-05-12)

Problem Types: CWE-787

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c75a8a7ae565d7cd9baa87a504ba9162e355b4b0 fa01973bb79d70c4736b6a4b2de99fbb2cbc8d1f git Not specified
CNA Linux Linux affected c75a8a7ae565d7cd9baa87a504ba9162e355b4b0 780dc57794a217b49994fa1d0b42465fb10a00aa git Not specified
CNA Linux Linux affected c75a8a7ae565d7cd9baa87a504ba9162e355b4b0 8995fc0e00b3fee9bf7ecb3d836b635b730c1049 git Not specified
CNA Linux Linux affected c75a8a7ae565d7cd9baa87a504ba9162e355b4b0 fc9e5af60dc199051dc202ae78e1fe76a9977a5e git Not specified
CNA Linux Linux affected c75a8a7ae565d7cd9baa87a504ba9162e355b4b0 6af16f1b8649df4c00d6ced924bdd8b72c885b6a git Not specified
CNA Linux Linux affected c75a8a7ae565d7cd9baa87a504ba9162e355b4b0 ccaf9296763be4f76b59e2cac377006016c34435 git Not specified
CNA Linux Linux affected c75a8a7ae565d7cd9baa87a504ba9162e355b4b0 fba2105a157fffcf19825e4eea498346738c9948 git Not specified
CNA Linux Linux affected 3.5 Not specified
CNA Linux Linux unaffected 3.5 semver Not specified
CNA Linux Linux unaffected 5.15.202 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.165 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.128 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.75 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.16 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.6 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fba2105a157fffcf19825e4eea498346738c9948 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/780dc57794a217b49994fa1d0b42465fb10a00aa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fa01973bb79d70c4736b6a4b2de99fbb2cbc8d1f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6af16f1b8649df4c00d6ced924bdd8b72c885b6a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8995fc0e00b3fee9bf7ecb3d836b635b730c1049 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ccaf9296763be4f76b59e2cac377006016c34435 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fc9e5af60dc199051dc202ae78e1fe76a9977a5e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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