ALSA: us122l: Prevent write upgrades for read mappings

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-97931
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:20 UTC
Updated2026-10-19 10:17:43 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ALSA: us122l: Prevent write upgrades for read mappings The hwdep mmap callback rejects read-buffer mappings that are initially writable, but leaves VM_MAYWRITE set on mappings created with PROT_READ. A process that can open the hwdep node O_RDWR can later use mprotect() to make the mapping writable. The read allocation begins with struct usb_stream. Its read_size member is used by the fault handler to decide which pages belong to the read buffer. The read VMA intentionally remains expandable because pcm_usb_stream uses mremap() after reading that size. Changing read_size first can therefore map and access pages beyond the allocation. The same member is also consumed by usb_stream_free(), where changing it can make free_pages_exact() release pages outside the allocation. Clear VM_MAYWRITE for read-buffer mappings after rejecting an initially writable VMA. This keeps the separate output-buffer mapping writable while preventing later permission upgrades.

Risk And Classification

Primary CVSS: v3.1 7 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001450000 probability, percentile 0.032290000 (date 2026-10-05)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 030a07e441296c372f946cd4065b5d831d8dc40c cbc1f954ce67d739d41d1f0757d29850353ebb6a git Not specified
CNA Linux Linux affected 030a07e441296c372f946cd4065b5d831d8dc40c becb89036a1320ef0a77da2d27935ac0704345c4 git Not specified
CNA Linux Linux affected 030a07e441296c372f946cd4065b5d831d8dc40c 6a5f5a5a32c78e67701f1d0f26bc87af68895604 git Not specified
CNA Linux Linux affected 030a07e441296c372f946cd4065b5d831d8dc40c 938e8d6cee8d36f24669dfdcd3717e081eb32d64 git Not specified
CNA Linux Linux affected 030a07e441296c372f946cd4065b5d831d8dc40c 64a87950239867682cde128020e1a47088295e5c git Not specified
CNA Linux Linux affected 030a07e441296c372f946cd4065b5d831d8dc40c d9c537b14f4982f17b103e3a2cfeee4bee6bc026 git Not specified
CNA Linux Linux affected 030a07e441296c372f946cd4065b5d831d8dc40c 0eb9dd4774af0ac4d1fd105ef2b0a1f6cec06f2f git Not specified
CNA Linux Linux affected 030a07e441296c372f946cd4065b5d831d8dc40c 71c610aeb1770302ac9c9e0b9a4ecd37f1311928 git Not specified
CNA Linux Linux affected 2.6.28 Not specified
CNA Linux Linux unaffected 2.6.28 semver Not specified
CNA Linux Linux unaffected 5.10.271 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.222 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.189 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/64a87950239867682cde128020e1a47088295e5c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cbc1f954ce67d739d41d1f0757d29850353ebb6a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0eb9dd4774af0ac4d1fd105ef2b0a1f6cec06f2f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/938e8d6cee8d36f24669dfdcd3717e081eb32d64 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d9c537b14f4982f17b103e3a2cfeee4bee6bc026 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/becb89036a1320ef0a77da2d27935ac0704345c4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/71c610aeb1770302ac9c9e0b9a4ecd37f1311928 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6a5f5a5a32c78e67701f1d0f26bc87af68895604 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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