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Bluetooth: virtio_bt: avoid OOB read of build info string

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-90257

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-90257

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "afd2daa26c7abd734d78bd274fc6c59a15e61063",
        "lessThan": "fb445b3466a8d1c7a0b0d0676fb475e3ce22d94e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "afd2daa26c7abd734d78bd274fc6c59a15e61063",
        "lessThan": "d08c99abf06133a7829d46627e77e3315ca974d2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "afd2daa26c7abd734d78bd274fc6c59a15e61063",
        "lessThan": "0e388d805233a883a31271676eae6031dfc9e898",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "afd2daa26c7abd734d78bd274fc6c59a15e61063",
        "lessThan": "54e9387eb7546eaa6f600220599d55740956ffc3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "afd2daa26c7abd734d78bd274fc6c59a15e61063",
        "lessThan": "be1e3df2c49c91b0a052c6563884e8d39bd768b2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "afd2daa26c7abd734d78bd274fc6c59a15e61063",
        "lessThan": "84ea9c99874804f5ca13f35bbc186ba93902f30f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "afd2daa26c7abd734d78bd274fc6c59a15e61063",
        "lessThan": "502adc06ba76dee19c292ae4a07d74d202fe734d",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/bluetooth/virtio_bt.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.13"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.13",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/bluetooth/virtio_bt.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90257

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#36622 · Revision 1
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Publisher date
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