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
No CVSS data available.
Assigner
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)
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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)
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            "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": "2026-07-27T17:44:23.777",
        "metrics": {},
        "published": "2026-07-19T16:17:13.460",
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b5c59a5b469e2a809a2d57eda4ded94235971060"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e8a5baff5be273ca07771fd2b9bb1f2a4152917b"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-07T13:49:06+00:00",
      "cve": "CVE-2026-63948",
      "id": "CVE-2026-63948",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "232",
      "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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T02:29:51Z",
      "cve": "CVE-2026-63948",
      "id": "CVE-2026-63948",
      "initial_release_date": "2026-07-21T13:02:57Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "542",
      "product_status:known_not_affected": "208",
      "product_status:recommended": "250",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63948",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63948.json",
      "version": "9"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.