CVE-2026-23395 (GCVE-0-2026-23395)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:33 – Updated: 2026-04-13 06:06
VLAI?
Title
Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ
Summary
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.
Severity ?
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < fb4a3a26483f3ea2cd21c7a2f7c45d5670600465 (git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 2124d82fd25e1671bb3ceb37998af5aae5903e06 (git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 6b949a6b33cbdf621d9fc6f0c48ac00915dbf514 (git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 8d0d94f8ba5b3a0beec3b0da558b9bea48018117 (git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < e72ee455297b794b852e5cea8d2d7bb17312172a (git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 5b3e2052334f2ff6d5200e952f4aa66994d09899 (git)
Create a notification for this product.
    Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/l2cap_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "fb4a3a26483f3ea2cd21c7a2f7c45d5670600465",
              "status": "affected",
              "version": "15f02b91056253e8cdc592888f431da0731337b8",
              "versionType": "git"
            },
            {
              "lessThan": "2124d82fd25e1671bb3ceb37998af5aae5903e06",
              "status": "affected",
              "version": "15f02b91056253e8cdc592888f431da0731337b8",
              "versionType": "git"
            },
            {
              "lessThan": "6b949a6b33cbdf621d9fc6f0c48ac00915dbf514",
              "status": "affected",
              "version": "15f02b91056253e8cdc592888f431da0731337b8",
              "versionType": "git"
            },
            {
              "lessThan": "8d0d94f8ba5b3a0beec3b0da558b9bea48018117",
              "status": "affected",
              "version": "15f02b91056253e8cdc592888f431da0731337b8",
              "versionType": "git"
            },
            {
              "lessThan": "e72ee455297b794b852e5cea8d2d7bb17312172a",
              "status": "affected",
              "version": "15f02b91056253e8cdc592888f431da0731337b8",
              "versionType": "git"
            },
            {
              "lessThan": "5b3e2052334f2ff6d5200e952f4aa66994d09899",
              "status": "affected",
              "version": "15f02b91056253e8cdc592888f431da0731337b8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/l2cap_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.7"
            },
            {
              "lessThan": "5.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.167",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.78",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.20",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.167",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.130",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.78",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.20",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.10",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ\n\nCurrently the code attempts to accept requests regardless of the\ncommand identifier which may cause multiple requests to be marked\nas pending (FLAG_DEFER_SETUP) which can cause more than\nL2CAP_ECRED_MAX_CID(5) to be allocated in l2cap_ecred_rsp_defer\ncausing an overflow.\n\nThe spec is quite clear that the same identifier shall not be used on\nsubsequent requests:\n\n\u0027Within each signaling channel a different Identifier shall be used\nfor each successive request or indication.\u0027\nhttps://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\n\nSo this attempts to check if there are any channels pending with the\nsame identifier and rejects if any are found."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-13T06:06:33.442Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fb4a3a26483f3ea2cd21c7a2f7c45d5670600465"
        },
        {
          "url": "https://git.kernel.org/stable/c/2124d82fd25e1671bb3ceb37998af5aae5903e06"
        },
        {
          "url": "https://git.kernel.org/stable/c/6b949a6b33cbdf621d9fc6f0c48ac00915dbf514"
        },
        {
          "url": "https://git.kernel.org/stable/c/8d0d94f8ba5b3a0beec3b0da558b9bea48018117"
        },
        {
          "url": "https://git.kernel.org/stable/c/e72ee455297b794b852e5cea8d2d7bb17312172a"
        },
        {
          "url": "https://git.kernel.org/stable/c/5b3e2052334f2ff6d5200e952f4aa66994d09899"
        }
      ],
      "title": "Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23395",
    "datePublished": "2026-03-25T10:33:18.936Z",
    "dateReserved": "2026-01-13T15:37:46.011Z",
    "dateUpdated": "2026-04-13T06:06:33.442Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-23395",
      "date": "2026-04-13",
      "epss": "0.0003",
      "percentile": "0.08523"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23395\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-03-25T11:16:40.347\",\"lastModified\":\"2026-04-02T09:16:20.763\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ\\n\\nCurrently the code attempts to accept requests regardless of the\\ncommand identifier which may cause multiple requests to be marked\\nas pending (FLAG_DEFER_SETUP) which can cause more than\\nL2CAP_ECRED_MAX_CID(5) to be allocated in l2cap_ecred_rsp_defer\\ncausing an overflow.\\n\\nThe spec is quite clear that the same identifier shall not be used on\\nsubsequent requests:\\n\\n\u0027Within each signaling channel a different Identifier shall be used\\nfor each successive request or indication.\u0027\\nhttps://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\\n\\nSo this attempts to check if there are any channels pending with the\\nsame identifier and rejects if any are found.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nBluetooth: L2CAP: Correcci\u00f3n para aceptar m\u00faltiples L2CAP_ECRED_CONN_REQ\\n\\nActualmente, el c\u00f3digo intenta aceptar solicitudes independientemente del identificador de comando, lo que puede hacer que m\u00faltiples solicitudes se marquen como pendientes (FLAG_DEFER_SETUP), lo que puede causar que se asignen m\u00e1s de L2CAP_ECRED_MAX_CID(5) en l2cap_ecred_rsp_defer, causando un desbordamiento.\\n\\nLa especificaci\u00f3n es bastante clara en que el mismo identificador no debe usarse en solicitudes subsiguientes:\\n\\n\u0027Dentro de cada canal de se\u00f1alizaci\u00f3n se utilizar\u00e1 un identificador diferente para cada solicitud o indicaci\u00f3n sucesiva.\u0027\\nhttps://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\\n\\nAs\u00ed que esto intenta verificar si hay canales pendientes con el mismo identificador y los rechaza si se encuentra alguno.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2124d82fd25e1671bb3ceb37998af5aae5903e06\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5b3e2052334f2ff6d5200e952f4aa66994d09899\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6b949a6b33cbdf621d9fc6f0c48ac00915dbf514\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8d0d94f8ba5b3a0beec3b0da558b9bea48018117\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e72ee455297b794b852e5cea8d2d7bb17312172a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fb4a3a26483f3ea2cd21c7a2f7c45d5670600465\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.