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CVE-2026-90093

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: access chan->conn safely in get/setsockopt Since commit b66774b48dd9 ("Bluetooth: L2CAP: Fix UAF in channel timeout by holding conn ref") l2cap_chan::conn has held reference and remains non-NULL also after the corresponding hci_conn is deleted. In this state accessing various fields eg. hci_conn::hdev is invalid, which leads to KASAN crash in l2cap_sock_setsockopt() access of conn->hcon->hdev. Check l2cap_chan::conn.hcon corresponds to an alive hci_conn before trying to use it in l2cap_sock.c. Hold l2cap_chan_lock() in getsockopt/setsockopt to ensure it stays alive, and to avoid data races in l2cap_chan fields.

Severity
HIGH
CVSS score
7.8 (v3.1)
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-09-17 17:17:00.900000
Last modified
2026-10-30 13:20:41.080000
View original CVE JSON 
{
  "id": "CVE-2026-90093",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-17T17:17:00.900",
  "lastModified": "2026-10-30T13:20:41.080",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: access chan->conn safely in get/setsockopt\n\nSince commit b66774b48dd9 (\"Bluetooth: L2CAP: Fix UAF in channel timeout by holding conn ref\")\nl2cap_chan::conn has held reference and remains non-NULL also after the\ncorresponding hci_conn is deleted.  In this state accessing various\nfields eg. hci_conn::hdev is invalid, which leads to KASAN crash in\nl2cap_sock_setsockopt() access of conn->hcon->hdev.\n\nCheck l2cap_chan::conn.hcon corresponds to an alive hci_conn before\ntrying to use it in l2cap_sock.c.  Hold l2cap_chan_lock() in\ngetsockopt/setsockopt to ensure it stays alive, and to avoid data races\nin l2cap_chan fields."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "net/bluetooth/l2cap_sock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "8f90405a4a6f1f1880dc07996b47bf57c712bd8a",
              "lessThan": "c66cd500ba1a58b3798c468fcc774ed2c8c2ec7d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "32d783cafb46ff3ca58e6f9fd62c9c5f35eaf26b",
              "lessThan": "737b80c97aef10404a9beed7c0ed45fcd5fc5931",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "8922c7940bae9ce4b1736dddb6362370793835c2",
              "lessThan": "0d7b7b31ea092e17d757bd24e2e9028ba5e3a4ca",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "91047a4396a8b1857a6f712a90cf33ec0012b189",
              "lessThan": "19e154d794eb4d33d99ca4a087b1cea9d5e65786",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "0b0e2bf39cf99e458d991b9df253727e036a7d7d",
              "lessThan": "3af72bf8f73c519ee562e6963d5ff8e678924f93",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "d3b739db5dc6f688a60d56da872fabaf65246032",
              "lessThan": "8460dc49c9756a1e9288218060b4d41e1b704905",
              "versionType": "git",
              "status": "affected"
            },
            {
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              "lessThan": "f49321c85785178214fd67f2e9b4b73d6363783b",
              "versionType": "git",
              "status": "affected"
            },
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              "lessThan": "ca2c4c26498643f421d35ffe258fafbd3ed461c3",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "50c38d9f42a529691e4e67ea9cedf4f0bfc8d277",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5.10.265",
              "lessThan": "5.10.273",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "5.15.216",
              "lessThan": "5.15.224",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.1.183",
              "lessThan": "6.1.191",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.6.145",
              "lessThan": "6.6.160",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.12.97",
              "lessThan": "6.12.114",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.18.39",
              "lessThan": "6.18.57",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "7.1.4",
              "lessThan": "7.2",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "net/bluetooth/l2cap_sock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "7.2",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "7.2",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.273",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.224",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.191",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.160",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.114",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.57",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.6",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0d7b7b31ea092e17d757bd24e2e9028ba5e3a4ca",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3af72bf8f73c519ee562e6963d5ff8e678924f93",
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      "url": "https://git.kernel.org/stable/c/737b80c97aef10404a9beed7c0ed45fcd5fc5931",
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    {
      "url": "https://git.kernel.org/stable/c/c66cd500ba1a58b3798c468fcc774ed2c8c2ec7d",
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    {
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    {
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}