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[].

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxbaac6276c0a9f36f1fe1f00590ef00d2ba5ba626 < 312c4450fe23014665c163f480edd5ad2e27bbb8affected
LinuxLinuxbaac6276c0a9f36f1fe1f00590ef00d2ba5ba626 < 9dd13a8641de79bc1bc93da55cdd35259a002683affected
LinuxLinuxbaac6276c0a9f36f1fe1f00590ef00d2ba5ba626 < 476c9262b430c38c6a701a3b8176a3f48689085baffected
LinuxLinuxbaac6276c0a9f36f1fe1f00590ef00d2ba5ba626 < 6fba3c3d48c927e55611a0f5ea34da88138ed0ffaffected
LinuxLinuxbaac6276c0a9f36f1fe1f00590ef00d2ba5ba626 < 834cf890d2c3d29cbfa1ee2376c40469c28ec297affected
LinuxLinuxbaac6276c0a9f36f1fe1f00590ef00d2ba5ba626 < 1019028eb124564cf7bca58a16f1df8a1ca30726affected
LinuxLinuxbaac6276c0a9f36f1fe1f00590ef00d2ba5ba626 < 21c254202f9d78abe0fcd642a92966deb92bd226affected
LinuxLinuxbaac6276c0a9f36f1fe1f00590ef00d2ba5ba626 < 129fa608b6ad08b8ab7178eeb2ec272c993aacccaffected
LinuxLinux5.8affected
LinuxLinux0 < 5.8unaffected
LinuxLinux5.10.253 <= 5.10.*unaffected
LinuxLinux5.15.203 <= 5.15.*unaffected
LinuxLinux6.1.168 <= 6.1.*unaffected
LinuxLinux6.6.131 <= 6.6.*unaffected
LinuxLinux6.12.80 <= 6.12.*unaffected
LinuxLinux6.18.21 <= 6.18.*unaffected
LinuxLinux6.19.11 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References