Linux Kernel btusb: SCO Altsetting Table OOB Access via SCO Link Count
CVE-2026-31497 Published on April 22, 2026
Bluetooth: btusb: clamp SCO altsetting table indices
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[].
Products Associated with CVE-2026-31497
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Affected Versions
Linux:- Version baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 and below 312c4450fe23014665c163f480edd5ad2e27bbb8 is affected.
- Version baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 and below 9dd13a8641de79bc1bc93da55cdd35259a002683 is affected.
- Version baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 and below 476c9262b430c38c6a701a3b8176a3f48689085b is affected.
- Version baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 and below 6fba3c3d48c927e55611a0f5ea34da88138ed0ff is affected.
- Version baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 and below 834cf890d2c3d29cbfa1ee2376c40469c28ec297 is affected.
- Version baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 and below 1019028eb124564cf7bca58a16f1df8a1ca30726 is affected.
- Version baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 and below 21c254202f9d78abe0fcd642a92966deb92bd226 is affected.
- Version baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 and below 129fa608b6ad08b8ab7178eeb2ec272c993aaccc is affected.
- Version 5.8 is affected.
- Before 5.8 is unaffected.
- Version 5.10.253, <= 5.10.* is unaffected.
- Version 5.15.203, <= 5.15.* is unaffected.
- Version 6.1.168, <= 6.1.* is unaffected.
- Version 6.6.131, <= 6.6.* is unaffected.
- Version 6.12.80, <= 6.12.* is unaffected.
- Version 6.18.21, <= 6.18.* is unaffected.
- Version 6.19.11, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.