CVE-2026-90257

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinuxafd2daa26c7abd734d78bd274fc6c59a15e61063 < fb445b3466a8d1c7a0b0d0676fb475e3ce22d94eaffected
LinuxLinuxafd2daa26c7abd734d78bd274fc6c59a15e61063 < d08c99abf06133a7829d46627e77e3315ca974d2affected
LinuxLinuxafd2daa26c7abd734d78bd274fc6c59a15e61063 < 0e388d805233a883a31271676eae6031dfc9e898affected
LinuxLinuxafd2daa26c7abd734d78bd274fc6c59a15e61063 < 54e9387eb7546eaa6f600220599d55740956ffc3affected
LinuxLinuxafd2daa26c7abd734d78bd274fc6c59a15e61063 < be1e3df2c49c91b0a052c6563884e8d39bd768b2affected
LinuxLinuxafd2daa26c7abd734d78bd274fc6c59a15e61063 < 84ea9c99874804f5ca13f35bbc186ba93902f30faffected
LinuxLinuxafd2daa26c7abd734d78bd274fc6c59a15e61063 < 502adc06ba76dee19c292ae4a07d74d202fe734daffected
LinuxLinux5.13affected
LinuxLinux0 < 5.13unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References