Bug 2536431 (CVE-2026-90257) - CVE-2026-90257 kernel: Bluetooth: virtio_bt: avoid OOB read of build info string
Summary: CVE-2026-90257 kernel: Bluetooth: virtio_bt: avoid OOB read of build info string
Keywords:
Status: NEW
Alias: CVE-2026-90257
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-17 17:48 UTC by OSIDB Bzimport
Modified: 2026-10-13 13:35 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-09-17 17:48:07 UTC
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.


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