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Bluetooth: virtio_bt: avoid OOB read of build info string

Type: advisorySources: OSV

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.

Products
Kernel
Affected versions
Not specified
Fixed versions
5.15.221, 6.1.188, 6.12.110, 6.18.52, 6.6.157, 7.2.6
CVEs
CVE-2026-90257
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 21:29 UTC · Revision 1

Source evidence

Bluetooth: virtio_bt: avoid OOB read of build info string

core-osv · Original source

Published 17 Sept 2026, 16:07 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.

osv:CVE-2026-90257

Kernel

Fixed versions: 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6

Complete source record
{
  "id": "1efe3e3f2c00080b3dfad7250c2166e8e24ca5de90617f3fd53213a6fba447e9",
  "url": "https://osv.dev/vulnerability/CVE-2026-90257",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Bluetooth: virtio_bt: avoid OOB read of build info string",
    "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.",
    "evidence": "osv:CVE-2026-90257",
    "products": [
      {
        "name": {
          "value": "Kernel",
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        },
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        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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    "severity": "unknown",
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      "aliases": [
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                  "introduced": "6.19.0"
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              ]
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
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      ],
      "modified": "2026-10-28T02:30:39.655102845Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0e388d805233a883a31271676eae6031dfc9e898",
        "https://git.kernel.org/stable/c/502adc06ba76dee19c292ae4a07d74d202fe734d",
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        "https://git.kernel.org/stable/c/d08c99abf06133a7829d46627e77e3315ca974d2",
        "https://git.kernel.org/stable/c/fb445b3466a8d1c7a0b0d0676fb475e3ce22d94e",
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      ],
      "provider_metadata": {
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      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-90257",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 507274,
  "published_at": "2026-09-17T16:07:56.089+00:00"
}