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Bluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp l2cap_le_connect_rsp() obtains a channel via __l2cap_get_chan_by_ident() but neither holds a reference nor uses l2cap_chan_hold_unless_zero() before locking and operating on it. A concurrent l2cap_chan_del() triggered by a remote disconnect can free the channel between the lookup and l2cap_chan_lock(), causing a use-after-free. The BR/EDR counterpart l2cap_connect_rsp() and the sibling handler l2cap_le_command_rej() already use l2cap_chan_hold_unless_zero() to safely hold a reference, but l2cap_le_connect_rsp() was left unprotected. Fix by adding l2cap_chan_hold_unless_zero() after the ident lookup and l2cap_chan_put() on the exit path, consistent with other L2CAP response handlers.

Announced Source revision 1
Original source ↗

CVE-2026-74540

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-2026-74540

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": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
        "lessThan": "15d6c2367217a6a20b1abae9f38ded716bf620f1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
        "lessThan": "1818180fe12d6cec7a437bc59cde8efdf6b10250",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
        "lessThan": "8325eafb38c3dee5af329266393763693d17381b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
        "lessThan": "fd4c1e301bdec60a40728ea37de531cbccda501a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
        "lessThan": "522b730c62c53a1981604fd73524697fd347830d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
        "lessThan": "58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
        "lessThan": "09f447accc2570751e7d17f0dc0788b40d3edade",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
        "lessThan": "c4740e7f23ff9a8210198d8b4703259e21b9f69d",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/bluetooth/l2cap_core.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.14"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.14",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.265",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.216",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.183",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.151",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.103",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.44",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.8",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bluetooth/l2cap_core.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74540

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#33198 · Revision 1
Added to Heist Feed
Publisher date
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