GHSA-R6QV-6H22-HPJ4

Vulnerability from github – Published: 2026-04-22 15:31 – Updated: 2026-04-28 15:30
VLAI?
Details

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv()

l2cap_ecred_data_rcv() reads the SDU length field from skb->data using get_unaligned_le16() without first verifying that skb contains at least L2CAP_SDULEN_SIZE (2) bytes. When skb->len is less than 2, this reads past the valid data in the skb.

The ERTM reassembly path correctly calls pskb_may_pull() before reading the SDU length (l2cap_reassemble_sdu, L2CAP_SAR_START case). Apply the same validation to the Enhanced Credit Based Flow Control data path.

Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-31512"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-22T14:16:50Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv()\n\nl2cap_ecred_data_rcv() reads the SDU length field from skb-\u003edata using\nget_unaligned_le16() without first verifying that skb contains at least\nL2CAP_SDULEN_SIZE (2) bytes. When skb-\u003elen is less than 2, this reads\npast the valid data in the skb.\n\nThe ERTM reassembly path correctly calls pskb_may_pull() before reading\nthe SDU length (l2cap_reassemble_sdu, L2CAP_SAR_START case). Apply the\nsame validation to the Enhanced Credit Based Flow Control data path.",
  "id": "GHSA-r6qv-6h22-hpj4",
  "modified": "2026-04-28T15:30:47Z",
  "published": "2026-04-22T15:31:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31512"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3340be2bafdcc806f048273ea6d8e82a6597aa1b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/40c7f7eea2f4d9cb0b3e924254c8c9053372168f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/477ad4976072056c348937e94f24583321938df4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5ad981249be52f5e4e92e0e97b436b569071cb86"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c96f3bd4ae0802db90630be8e9851827e9c9209"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c65bd945d1c08c3db756821b6bf9f1c4a77b29c6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cef09691cfb61f6c91cc27c3d69634f81c8ab949"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e47315b84d0eb188772c3ff5cf073cdbdefca6b4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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