CVE-2026-63948
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.
Affected versions
Linux kernel versions
5.10.217,
5.15.159,
6.1.91,
6.6.31,
4.19.314,
5.4.276,
6.8.10,
6.9
and later are affected. Fixed in
5.10.259,
5.15.210,
6.1.176,
6.6.143,
6.12.93,
6.18.35,
7.0.12,
7.1
and their respective stable series.
References
8 totalFrequently asked questions
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What is CVE-2026-63948?
CVE-2026-63948 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.10.217 onward and has been patched in 5.10.259, 5.15.210, 6.1.176 and others. CVE-2026-63948 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-63948?
Yes — CVE-2026-63948 has been patched. Fixed versions include 5.10.259, 5.15.210, 6.1.176 and others. If you are running Linux kernel 5.10.217 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-63948 actively exploited?
No — CVE-2026-63948 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.