Bluetooth: btusb: clamp SCO altsetting table indices

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Summary

CVECVE-2026-31497
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 14:16:47 UTC
Updated2026-04-28 14:42:28 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: btusb: clamp SCO altsetting table indices btusb_work() maps the number of active SCO links to USB alternate settings through a three-entry lookup table when CVSD traffic uses transparent voice settings. The lookup currently indexes alts[] with data->sco_num - 1 without first constraining sco_num to the number of available table entries. While the table only defines alternate settings for up to three SCO links, data->sco_num comes from hci_conn_num() and is used directly. Cap the lookup to the last table entry before indexing it so the driver keeps selecting the highest supported alternate setting without reading past alts[].

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

EPSS: 0.000240000 probability, percentile 0.067930000 (date 2026-04-26)

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 312c4450fe23014665c163f480edd5ad2e27bbb8 git Not specified
CNA Linux Linux affected baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 9dd13a8641de79bc1bc93da55cdd35259a002683 git Not specified
CNA Linux Linux affected baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 476c9262b430c38c6a701a3b8176a3f48689085b git Not specified
CNA Linux Linux affected baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 6fba3c3d48c927e55611a0f5ea34da88138ed0ff git Not specified
CNA Linux Linux affected baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 834cf890d2c3d29cbfa1ee2376c40469c28ec297 git Not specified
CNA Linux Linux affected baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 1019028eb124564cf7bca58a16f1df8a1ca30726 git Not specified
CNA Linux Linux affected baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 21c254202f9d78abe0fcd642a92966deb92bd226 git Not specified
CNA Linux Linux affected baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 129fa608b6ad08b8ab7178eeb2ec272c993aaccc git Not specified
CNA Linux Linux affected 5.8 Not specified
CNA Linux Linux unaffected 5.8 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.131 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.80 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.21 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9dd13a8641de79bc1bc93da55cdd35259a002683 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/129fa608b6ad08b8ab7178eeb2ec272c993aaccc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/312c4450fe23014665c163f480edd5ad2e27bbb8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/834cf890d2c3d29cbfa1ee2376c40469c28ec297 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/21c254202f9d78abe0fcd642a92966deb92bd226 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1019028eb124564cf7bca58a16f1df8a1ca30726 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6fba3c3d48c927e55611a0f5ea34da88138ed0ff 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/476c9262b430c38c6a701a3b8176a3f48689085b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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