CVE-2026-63948 (GCVE-0-2026-63948)
Vulnerability from cvelistv5
Published
2026-07-19 14:55
Modified
2026-07-19 14:55
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 06acb75e7ed600d0bbf7bff5628aa8f24a97978c
Version: e97e16433eb4533083b096a3824b93a5ca3aee79
Version: 8960ff650aec70485b40771cd8e6e8c4cb467d33
Version: 955b5b6c54d95b5e7444dfc81c95c8e013f27ac0
Version: adf0398cee86643b8eacde95f17d073d022f782c
Version: adf0398cee86643b8eacde95f17d073d022f782c
Version: adf0398cee86643b8eacde95f17d073d022f782c
Version: adf0398cee86643b8eacde95f17d073d022f782c
Version: e137e2ba96e51902dc2878131823a96bf8e638ae
Version: 6466ee65e5b27161c846c73ef407f49dfa1bd1d9
Version: eb86f955488c39526534211f2610e48a5cf8ead4
Version: 5.10.217   ≤
Version: 5.15.159   ≤
Version: 6.1.91   ≤
Version: 6.6.31   ≤
Version: 4.19.314   ≤
Version: 5.4.276   ≤
Version: 6.8.10   ≤
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      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T14:55:41.985Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/50f1bcaaaa3a80bb1c3472044bc146e8d49d51ee"
        },
        {
          "url": "https://git.kernel.org/stable/c/b5c59a5b469e2a809a2d57eda4ded94235971060"
        },
        {
          "url": "https://git.kernel.org/stable/c/8894c2010435a56ce7c6c2a8785860c13554df2f"
        },
        {
          "url": "https://git.kernel.org/stable/c/63cd225cc13d782a85e2a73c04d0d350153eada1"
        },
        {
          "url": "https://git.kernel.org/stable/c/107c826e4ef9ec5ad8f60e6fe64d8d5325ba508f"
        },
        {
          "url": "https://git.kernel.org/stable/c/e8a5baff5be273ca07771fd2b9bb1f2a4152917b"
        },
        {
          "url": "https://git.kernel.org/stable/c/08d81fe96f80a8e20c7acb573b6a45d901fcf2cd"
        },
        {
          "url": "https://git.kernel.org/stable/c/9dbd84990394c51f5cee1e8871bb5ff8af5ed939"
        }
      ],
      "title": "Bluetooth: L2CAP: fix chan ref leak in l2cap_chan_timeout() on !conn",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63948",
    "datePublished": "2026-07-19T14:55:41.985Z",
    "dateReserved": "2026-07-19T07:54:57.023Z",
    "dateUpdated": "2026-07-19T14:55:41.985Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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