CVE-2026-63948
Published Jul 19, 2026
Description
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.
Is your site exposed to CVE-2026-63948?
Run a free security scan — no signup, results in seconds.
EPSS — Exploit Prediction
0.0021
Probability of exploitation
0.11%
Percentile rank
EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.
References
Other References
https://git.kernel.org/stable/c/08d81fe96f80a8e20c7acb573b6a45d901fcf2cd
https://git.kernel.org/stable/c/107c826e4ef9ec5ad8f60e6fe64d8d5325ba508f
https://git.kernel.org/stable/c/50f1bcaaaa3a80bb1c3472044bc146e8d49d51ee
https://git.kernel.org/stable/c/63cd225cc13d782a85e2a73c04d0d350153eada1
https://git.kernel.org/stable/c/8894c2010435a56ce7c6c2a8785860c13554df2f
https://git.kernel.org/stable/c/9dbd84990394c51f5cee1e8871bb5ff8af5ed939
https://git.kernel.org/stable/c/b5c59a5b469e2a809a2d57eda4ded94235971060
https://git.kernel.org/stable/c/e8a5baff5be273ca07771fd2b9bb1f2a4152917b
Frequently Asked Questions
What is 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.
How do I check if I'm vulnerable to CVE-2026-63948? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.