CVE-2026-31497

Summary

In 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[].

Impact & exploitability

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

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/1019028eb124564cf7bca58a16f1df8a1ca30726 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/1019028eb124564cf7bca58a16f1df8a1ca30726Patch
• https://git.kernel.org/stable/c/129fa608b6ad08b8ab7178eeb2ec272c993aacccPatch
• https://git.kernel.org/stable/c/21c254202f9d78abe0fcd642a92966deb92bd226Patch
• https://git.kernel.org/stable/c/312c4450fe23014665c163f480edd5ad2e27bbb8Patch
• https://git.kernel.org/stable/c/476c9262b430c38c6a701a3b8176a3f48689085bPatch
• https://git.kernel.org/stable/c/6fba3c3d48c927e55611a0f5ea34da88138ed0ffPatch
• https://git.kernel.org/stable/c/834cf890d2c3d29cbfa1ee2376c40469c28ec297Patch
• https://git.kernel.org/stable/c/9dd13a8641de79bc1bc93da55cdd35259a002683Patch