CVE-2026-63975
Published Jul 19, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp If dcid is received for an already-assigned destination CID the spec requires that both channels to be discarded, but calling l2cap_chan_del may invalidate the tmp cursor created by list_for_each_entry_safe and in fact it is the wrong procedure as the chan->dcid may be assigned previously it really needs to be disconnected. Calling l2cap_chan_clone directly may still lead to l2cap_chan_del so instead schedule l2cap_chan_timeout with delay 0 to close the channel asynchronously.
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References
Other References
https://git.kernel.org/stable/c/291eec1041c918c460dc9702e44edd17794b4a4b
https://git.kernel.org/stable/c/3c8eaa91eb433c450426539290be4ffe282e9f00
https://git.kernel.org/stable/c/41c2713b204e6cb6a94587bc6bf6935107df5479
https://git.kernel.org/stable/c/41e29548b5e8b5e5fcf708786b3bea67cab107fa
https://git.kernel.org/stable/c/6319b38fe69f56ed95680ade485b957a53fff642
https://git.kernel.org/stable/c/d153b8898c0051eb8b6a083b35cbe304a5886bd5
https://git.kernel.org/stable/c/e6833e737a51db1e5ea0401322acf5e22abd8be6
https://git.kernel.org/stable/c/ecfed1e0d8efecad6737a0d83e21d2fd021d8c48
Frequently Asked Questions
What is CVE-2026-63975? +
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp
If dcid is received for an already-assigned destination CID the spec
requires that both channels to be discarded, but calling l2cap_chan_del
may invalidate the tmp cursor created by list_for_each_entry_safe and
in fact it is the wrong procedure as the chan->dcid may be assigned
previously it really needs to be disconnected.
Calling l2cap_chan_clone directly may still lead to l2cap_chan_del so
instead schedule l2cap_chan_timeout with delay 0 to close the channel
asynchronously.
How do I check if I'm vulnerable to CVE-2026-63975? +
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.