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GHSA-G36P-Q7H2-H3PP

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-20 15:31

Details

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp

If dcid is received for an already-assigned destination CID the spec requires that both channels to be discarded, but calling l2cap_chan_del may invalidate the tmp cursor created by list_for_each_entry_safe and in fact it is the wrong procedure as the chan->dcid may be assigned previously it really needs to be disconnected.

Calling l2cap_chan_clone directly may still lead to l2cap_chan_del so instead schedule l2cap_chan_timeout with delay 0 to close the channel asynchronously.

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-63975"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:16Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp\n\nIf dcid is received for an already-assigned destination CID the spec\nrequires that both channels to be discarded, but calling l2cap_chan_del\nmay invalidate the tmp cursor created by list_for_each_entry_safe and\nin fact it is the wrong procedure as the chan-\u003edcid may be assigned\npreviously it really needs to be disconnected.\n\nCalling l2cap_chan_clone directly may still lead to l2cap_chan_del so\ninstead schedule l2cap_chan_timeout with delay 0 to close the channel\nasynchronously.",
  "id": "GHSA-g36p-q7h2-h3pp",
  "modified": "2026-07-20T15:31:53Z",
  "published": "2026-07-19T18:31:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63975"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/291eec1041c918c460dc9702e44edd17794b4a4b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c8eaa91eb433c450426539290be4ffe282e9f00"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41c2713b204e6cb6a94587bc6bf6935107df5479"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41e29548b5e8b5e5fcf708786b3bea67cab107fa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6319b38fe69f56ed95680ade485b957a53fff642"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d153b8898c0051eb8b6a083b35cbe304a5886bd5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e6833e737a51db1e5ea0401322acf5e22abd8be6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ecfed1e0d8efecad6737a0d83e21d2fd021d8c48"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-63975 (GCVE-0-2026-63975)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:56 – Updated: 2026-08-05 12:37

Title

Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp If dcid is received for an already-assigned destination CID the spec requires that both channels to be discarded, but calling l2cap_chan_del may invalidate the tmp cursor created by list_for_each_entry_safe and in fact it is the wrong procedure as the chan->dcid may be assigned previously it really needs to be disconnected. Calling l2cap_chan_clone directly may still lead to l2cap_chan_del so instead schedule l2cap_chan_timeout with delay 0 to close the channel asynchronously.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/3c8eaa91eb433c450…
https://git.kernel.org/stable/c/ecfed1e0d8efecad6…
https://git.kernel.org/stable/c/e6833e737a51db1e5…
https://git.kernel.org/stable/c/6319b38fe69f56ed9…
https://git.kernel.org/stable/c/291eec1041c918c46…
https://git.kernel.org/stable/c/41e29548b5e8b5e5f…
https://git.kernel.org/stable/c/d153b8898c0051eb8…
https://git.kernel.org/stable/c/41c2713b204e6cb6a…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 3c8eaa91eb433c450426539290be4ffe282e9f00 (git) Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < ecfed1e0d8efecad6737a0d83e21d2fd021d8c48 (git) Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < e6833e737a51db1e5ea0401322acf5e22abd8be6 (git) Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 6319b38fe69f56ed95680ade485b957a53fff642 (git) Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 291eec1041c918c460dc9702e44edd17794b4a4b (git) Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 41e29548b5e8b5e5fcf708786b3bea67cab107fa (git) Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < d153b8898c0051eb8b6a083b35cbe304a5886bd5 (git) Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 41c2713b204e6cb6a94587bc6bf6935107df5479 (git)
Linux	Linux	Affected: 5.7 Unaffected: 0 , < 5.7 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.93 , ≤ 6.12.* (semver) Unaffected: 6.18.35 , ≤ 6.18.* (semver) Unaffected: 7.0.12 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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JSON

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{
  "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": "3c8eaa91eb433c450426539290be4ffe282e9f00",
              "status": "affected",
              "version": "15f02b91056253e8cdc592888f431da0731337b8",
              "versionType": "git"
            },
            {
              "lessThan": "ecfed1e0d8efecad6737a0d83e21d2fd021d8c48",
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              "version": "15f02b91056253e8cdc592888f431da0731337b8",
              "versionType": "git"
            },
            {
              "lessThan": "e6833e737a51db1e5ea0401322acf5e22abd8be6",
              "status": "affected",
              "version": "15f02b91056253e8cdc592888f431da0731337b8",
              "versionType": "git"
            },
            {
              "lessThan": "6319b38fe69f56ed95680ade485b957a53fff642",
              "status": "affected",
              "version": "15f02b91056253e8cdc592888f431da0731337b8",
              "versionType": "git"
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            {
              "lessThan": "291eec1041c918c460dc9702e44edd17794b4a4b",
              "status": "affected",
              "version": "15f02b91056253e8cdc592888f431da0731337b8",
              "versionType": "git"
            },
            {
              "lessThan": "41e29548b5e8b5e5fcf708786b3bea67cab107fa",
              "status": "affected",
              "version": "15f02b91056253e8cdc592888f431da0731337b8",
              "versionType": "git"
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            {
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              "status": "affected",
              "version": "15f02b91056253e8cdc592888f431da0731337b8",
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              "versionType": "git"
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          "product": "Linux",
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          "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": "5.10.*",
              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.93",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.35",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.12",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                }
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              "negate": false,
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp\n\nIf dcid is received for an already-assigned destination CID the spec\nrequires that both channels to be discarded, but calling l2cap_chan_del\nmay invalidate the tmp cursor created by list_for_each_entry_safe and\nin fact it is the wrong procedure as the chan-\u003edcid may be assigned\npreviously it really needs to be disconnected.\n\nCalling l2cap_chan_clone directly may still lead to l2cap_chan_del so\ninstead schedule l2cap_chan_timeout with delay 0 to close the channel\nasynchronously."
        }
      ],
      "metrics": [
        {
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            "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The bug is reached when a remote Bluetooth LE peer sends a crafted L2CAP_ECRED_CONN_RSP on the LE signaling channel, processed via hci_recv_frame \u2192 l2cap_recv_acldata \u2192 l2cap_le_sig_channel \u2192 l2cap_ecred_conn_rsp. Bluetooth is Adjacent per kernel CVSS guidance.\nAC:L - An adjacent attacker who establishes a BLE ACL link can reliably trigger this by first creating an L2CAP channel with a chosen DCID (via ECRED_CONN_REQ SCIDs) and then sending a connection response reusing that DCID for a pending outgoing ECRED connection; no race or rare layout is required.\nPR:N - Exploitation requires only the ability to act as a remote Bluetooth peer on an established ACL connection; no local shell access, capabilities, or root on the victim system is needed.\nUI:N - The malicious signaling traffic is delivered entirely by the remote attacker once a BLE link exists; no additional victim-side file open, mount, or application action beyond normal Bluetooth connectivity is required to reach the vulnerable handler.\nS:U - The failure is a kernel L2CAP channel-list use-after-free and crash within the Bluetooth stack on the victim host; it does not cross a VM, container, or IOMMU security boundary.\nC:H - Calling l2cap_chan_del() on the original channel during list_for_each_entry_safe can free the saved tmp list node, causing a use-after-free on struct l2cap_chan when iteration continues; UAF is scored as High confidentiality impact.\nI:H - The same iterator invalidation frees and later dereferences l2cap_chan objects under attacker-influenced connection state, providing a heap UAF primitive that can be groomed toward arbitrary memory corruption and code execution.\nA:H - The bug reliably produces kernel list corruption and use-after-free in softirq/context Bluetooth receive path, leading to kernel oops or panic and denial of service on phones, laptops, and embedded devices with Bluetooth enabled."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:37:46.003Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/3c8eaa91eb433c450426539290be4ffe282e9f00"
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        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/6319b38fe69f56ed95680ade485b957a53fff642"
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          "url": "https://git.kernel.org/stable/c/291eec1041c918c460dc9702e44edd17794b4a4b"
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        },
        {
          "url": "https://git.kernel.org/stable/c/d153b8898c0051eb8b6a083b35cbe304a5886bd5"
        },
        {
          "url": "https://git.kernel.org/stable/c/41c2713b204e6cb6a94587bc6bf6935107df5479"
        }
      ],
      "title": "Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63975",
    "datePublished": "2026-07-19T14:56:00.662Z",
    "dateReserved": "2026-07-19T07:54:57.024Z",
    "dateUpdated": "2026-08-05T12:37:46.003Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-G36P-Q7H2-H3PP

CVE-2026-63975 (GCVE-0-2026-63975)

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