CVE-2026-90257 (GCVE-0-2026-90257)
Vulnerability from cvelistv5
Published
2026-09-17 16:07
Modified
2026-10-19 09:00
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: afd2daa26c7abd734d78bd274fc6c59a15e61063
Version: afd2daa26c7abd734d78bd274fc6c59a15e61063
Version: afd2daa26c7abd734d78bd274fc6c59a15e61063
Version: afd2daa26c7abd734d78bd274fc6c59a15e61063
Version: afd2daa26c7abd734d78bd274fc6c59a15e61063
Version: afd2daa26c7abd734d78bd274fc6c59a15e61063
Version: afd2daa26c7abd734d78bd274fc6c59a15e61063
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/bluetooth/virtio_bt.c"
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "5.13"
            },
            {
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              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
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            {
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              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
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              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "vulnerable": true
                },
                {
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: virtio_bt: avoid OOB read of build info string\n\nThe virtbt_setup_zephyr() sends the Zephyr vendor command 0xfc08 (Read\nBuild Information) and hands the response to bt_dev_info() and\nhci_set_fw_info() as a \"%s\" string starting at skb-\u003edata + 1, without\nchecking the length. A backend that answers with status only leaves that\npointer past the end of the received data, so the walk reads adjacent\nslab memory until it meets a NUL. Those bytes reach the kernel log and\nthe firmware-info debugfs file.\n\nTo fix this, print the string with a bounded \"%.*s\" limited to\nskb-\u003elen - 1. A short or unterminated response then prints as much as\narrived instead of failing setup.\n\nThis mirrors commit dd068ef04412 (\"Bluetooth: bpa10x: avoid OOB read of\nrevision string in bpa10x_setup()\"), which fixed the identical pattern."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:00:33.856Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fb445b3466a8d1c7a0b0d0676fb475e3ce22d94e"
        },
        {
          "url": "https://git.kernel.org/stable/c/d08c99abf06133a7829d46627e77e3315ca974d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e388d805233a883a31271676eae6031dfc9e898"
        },
        {
          "url": "https://git.kernel.org/stable/c/54e9387eb7546eaa6f600220599d55740956ffc3"
        },
        {
          "url": "https://git.kernel.org/stable/c/be1e3df2c49c91b0a052c6563884e8d39bd768b2"
        },
        {
          "url": "https://git.kernel.org/stable/c/84ea9c99874804f5ca13f35bbc186ba93902f30f"
        },
        {
          "url": "https://git.kernel.org/stable/c/502adc06ba76dee19c292ae4a07d74d202fe734d"
        }
      ],
      "title": "Bluetooth: virtio_bt: avoid OOB read of build info string",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90257",
    "datePublished": "2026-09-17T16:07:56.089Z",
    "dateReserved": "2026-09-11T19:38:34.796Z",
    "dateUpdated": "2026-10-19T09:00:33.856Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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