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Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ Currently the code attempts to accept requests regardless of the command identifier which may cause multiple requests to be marked as pending (FLAG_DEFER_SETUP) which can cause more than L2CAP_ECRED_MAX_CID(5) to be allocated in l2cap_ecred_rsp_defer causing an overflow. The spec is quite clear that the same identifier shall not be used on subsequent requests: 'Within each signaling channel a different Identifier shall be used for each successive request or indication.' https://www.bluetooth.com/wp-content/uploads/Files/Specification/HTML/Core-62/out/en/host/logical-link-control-and-adaptation-protocol-specification.html#UUID-32a25a06-4aa4-c6c7-77c5-dcfe3682355d So this attempts to check if there are any channels pending with the same identifier and rejects if any are found.

Announced Source revision 1
Original source ↗

CVE-2026-23395

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-2026-23395

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": "15f02b91056253e8cdc592888f431da0731337b8",
        "lessThan": "10a7a702542240d5edb2b39450ac951c59ccd009",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "15f02b91056253e8cdc592888f431da0731337b8",
        "lessThan": "46e5b71666fb7652082e4e214a3365f4b14f1dc3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "15f02b91056253e8cdc592888f431da0731337b8",
        "lessThan": "fb4a3a26483f3ea2cd21c7a2f7c45d5670600465",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "15f02b91056253e8cdc592888f431da0731337b8",
        "lessThan": "2124d82fd25e1671bb3ceb37998af5aae5903e06",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "15f02b91056253e8cdc592888f431da0731337b8",
        "lessThan": "6b949a6b33cbdf621d9fc6f0c48ac00915dbf514",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "15f02b91056253e8cdc592888f431da0731337b8",
        "lessThan": "8d0d94f8ba5b3a0beec3b0da558b9bea48018117",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "15f02b91056253e8cdc592888f431da0731337b8",
        "lessThan": "e72ee455297b794b852e5cea8d2d7bb17312172a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "15f02b91056253e8cdc592888f431da0731337b8",
        "lessThan": "5b3e2052334f2ff6d5200e952f4aa66994d09899",
        "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": "5.7"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.7",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.253",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.203",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.167",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.130",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.78",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.20",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.10",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bluetooth/l2cap_core.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-23395

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#39843 · Revision 1
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Publisher date
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