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Bluetooth: L2CAP: access chan->conn safely in get/setsockopt

Type: advisorySource: Official CVE List1 source record

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.

Announced Group revision 1
Original source ↗

CVE-2026-90093

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-2026-90093

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": "91047a4396a8b1857a6f712a90cf33ec0012b189",
        "lessThan": "19e154d794eb4d33d99ca4a087b1cea9d5e65786",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0b0e2bf39cf99e458d991b9df253727e036a7d7d",
        "lessThan": "3af72bf8f73c519ee562e6963d5ff8e678924f93",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d3b739db5dc6f688a60d56da872fabaf65246032",
        "lessThan": "8460dc49c9756a1e9288218060b4d41e1b704905",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b66774b48dd98f07254951f74ea6f513efe7ff8b",
        "lessThan": "f49321c85785178214fd67f2e9b4b73d6363783b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b66774b48dd98f07254951f74ea6f513efe7ff8b",
        "lessThan": "ca2c4c26498643f421d35ffe258fafbd3ed461c3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8f90405a4a6f1f1880dc07996b47bf57c712bd8a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "32d783cafb46ff3ca58e6f9fd62c9c5f35eaf26b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8922c7940bae9ce4b1736dddb6362370793835c2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "50c38d9f42a529691e4e67ea9cedf4f0bfc8d277",
        "versionType": "git"
      },
      {
        "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": "5.10.265",
        "lessThan": "5.11",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.15.216",
        "lessThan": "5.16",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.1.183",
        "lessThan": "6.2",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "7.1.4",
        "lessThan": "7.2",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "net/bluetooth/l2cap_sock.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "7.2"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "7.2",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.114",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.57",
        "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": [
      "net/bluetooth/l2cap_sock.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90093

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#48599 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-90093 · Revision 1Source updated