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
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)
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)
Create a notification for this product.
Show details on NVD website
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          "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."
        }
      ],
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        "dateUpdated": "2026-07-19T14:55:41.985Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/50f1bcaaaa3a80bb1c3472044bc146e8d49d51ee"
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          "url": "https://git.kernel.org/stable/c/b5c59a5b469e2a809a2d57eda4ded94235971060"
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          "url": "https://git.kernel.org/stable/c/9dbd84990394c51f5cee1e8871bb5ff8af5ed939"
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      "title": "Bluetooth: L2CAP: fix chan ref leak in l2cap_chan_timeout() on !conn",
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    "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"
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      "date": "2026-07-21",
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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 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",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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