---
id: CVE-2026-90257
title: |-
  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 respo…
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 respo…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= afd2daa26c7abd734d78bd274fc6c59a15e61063 <
    fb445b3466a8d1c7a0b0d0676fb475e3ce22d94e
  - >-
    Linux >= afd2daa26c7abd734d78bd274fc6c59a15e61063 <
    d08c99abf06133a7829d46627e77e3315ca974d2
  - >-
    Linux >= afd2daa26c7abd734d78bd274fc6c59a15e61063 <
    0e388d805233a883a31271676eae6031dfc9e898
  - >-
    Linux >= afd2daa26c7abd734d78bd274fc6c59a15e61063 <
    54e9387eb7546eaa6f600220599d55740956ffc3
  - >-
    Linux >= afd2daa26c7abd734d78bd274fc6c59a15e61063 <
    be1e3df2c49c91b0a052c6563884e8d39bd768b2
  - >-
    Linux >= afd2daa26c7abd734d78bd274fc6c59a15e61063 <
    84ea9c99874804f5ca13f35bbc186ba93902f30f
  - >-
    Linux >= afd2daa26c7abd734d78bd274fc6c59a15e61063 <
    502adc06ba76dee19c292ae4a07d74d202fe734d
  - Linux 5.13
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:22.087'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90257'
references:
  - url: 'https://git.kernel.org/stable/c/0e388d805233a883a31271676eae6031dfc9e898'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/502adc06ba76dee19c292ae4a07d74d202fe734d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/54e9387eb7546eaa6f600220599d55740956ffc3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/84ea9c99874804f5ca13f35bbc186ba93902f30f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/be1e3df2c49c91b0a052c6563884e8d39bd768b2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d08c99abf06133a7829d46627e77e3315ca974d2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/fb445b3466a8d1c7a0b0d0676fb475e3ce22d94e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.841Z'
epss: 0.00215
epssPercentile: 0.10554
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.