CVE-2026-63948 (GCVE-0-2026-63948)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-19 14:55
VLAI
Title
Bluetooth: L2CAP: fix chan ref leak in l2cap_chan_timeout() on !conn
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: fix chan ref leak in l2cap_chan_timeout() on !conn __set_chan_timer() takes a l2cap_chan reference via l2cap_chan_hold() before scheduling the delayed work. The normal path in l2cap_chan_timeout() drops this reference with l2cap_chan_put() at the end, but the early return when chan->conn is NULL skips the put, leaking the reference. Add the missing l2cap_chan_put() before the early return.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 06acb75e7ed600d0bbf7bff5628aa8f24a97978c , < 50f1bcaaaa3a80bb1c3472044bc146e8d49d51ee (git)
Affected: e97e16433eb4533083b096a3824b93a5ca3aee79 , < b5c59a5b469e2a809a2d57eda4ded94235971060 (git)
Affected: 8960ff650aec70485b40771cd8e6e8c4cb467d33 , < 8894c2010435a56ce7c6c2a8785860c13554df2f (git)
Affected: 955b5b6c54d95b5e7444dfc81c95c8e013f27ac0 , < 63cd225cc13d782a85e2a73c04d0d350153eada1 (git)
Affected: adf0398cee86643b8eacde95f17d073d022f782c , < 107c826e4ef9ec5ad8f60e6fe64d8d5325ba508f (git)
Affected: adf0398cee86643b8eacde95f17d073d022f782c , < e8a5baff5be273ca07771fd2b9bb1f2a4152917b (git)
Affected: adf0398cee86643b8eacde95f17d073d022f782c , < 08d81fe96f80a8e20c7acb573b6a45d901fcf2cd (git)
Affected: adf0398cee86643b8eacde95f17d073d022f782c , < 9dbd84990394c51f5cee1e8871bb5ff8af5ed939 (git)
Affected: e137e2ba96e51902dc2878131823a96bf8e638ae (git)
Affected: 6466ee65e5b27161c846c73ef407f49dfa1bd1d9 (git)
Affected: eb86f955488c39526534211f2610e48a5cf8ead4 (git)
Affected: 5.10.217 , < 5.10.259 (semver)
Affected: 5.15.159 , < 5.15.210 (semver)
Affected: 6.1.91 , < 6.1.176 (semver)
Affected: 6.6.31 , < 6.6.143 (semver)
Affected: 4.19.314 , < 4.20 (semver)
Affected: 5.4.276 , < 5.5 (semver)
Affected: 6.8.10 , < 6.9 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.9
Unaffected: 0 , < 6.9 (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)
guessed Create a notification for this product.
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: fix chan ref leak in l2cap_chan_timeout() on !conn\n\n__set_chan_timer() takes a l2cap_chan reference via l2cap_chan_hold()\nbefore scheduling the delayed work.  The normal path in\nl2cap_chan_timeout() drops this reference with l2cap_chan_put() at the\nend, but the early return when chan-\u003econn is NULL skips the put,\nleaking the reference.\n\nAdd the missing l2cap_chan_put() before the early return."
          }
        ],
        "id": "CVE-2026-63948",
        "lastModified": "2026-10-30T14:27:52.857",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2026-07-19T16:17:13.460",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
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          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
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        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-30T15:50:22+00:00",
      "cve": "CVE-2026-63948",
      "id": "CVE-2026-63948",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "234",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: L2CAP: fix chan ref leak in l2cap_chan_timeout() on !conn",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63948.json",
      "version": "3"
    }
  }
}



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