CVE-2026-90257Bluetooth: virtio_bt: avoid OOB read of build info string

Official description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: virtio_bt: avoid OOB read of build info string The virtbt_setup_zephyr() sends the Zephyr vendor command 0xfc08 (Read Build Information) and hands the response to bt_dev_info() and hci_set_fw_info() as a "%s" string starting at skb->data + 1, without checking the length. A backend that answers with status only leaves that pointer past the end of the received data, so the walk reads adjacent slab memory until it meets a NUL. Those bytes reach the kernel log and the firmware-info debugfs file. To fix this, print the string with a bounded "%.*s" limited to skb->len - 1. A short or unterminated response then prints as much as arrived instead of failing setup. This mirrors commit dd068ef04412 ("Bluetooth: bpa10x: avoid OOB read of revision string in bpa10x_setup()"), which fixed the identical pattern.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/fb445b3466a8d1c7a0b0d0676fb475e3ce22d94e
• https://git.kernel.org/stable/c/d08c99abf06133a7829d46627e77e3315ca974d2
• https://git.kernel.org/stable/c/0e388d805233a883a31271676eae6031dfc9e898
• https://git.kernel.org/stable/c/54e9387eb7546eaa6f600220599d55740956ffc3
• https://git.kernel.org/stable/c/be1e3df2c49c91b0a052c6563884e8d39bd768b2
• https://git.kernel.org/stable/c/84ea9c99874804f5ca13f35bbc186ba93902f30f
• https://git.kernel.org/stable/c/502adc06ba76dee19c292ae4a07d74d202fe734d