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8.8
Linux Bluetooth: Possible Crash When Connecting Devices
published 3 months ago
Summary
A fix has been made to prevent a potential crash in Linux's Bluetooth connection system. This issue could have occurred when devices were connecting to each other, but it's now resolved. Update your Linux kernel to ensure you have this fix.
What to do
- Update linux kernel to version 7.0.12.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Linux | linux | kernel |
>= 6.19.0, < 7.0.12 Fix: upgrade to 7.0.12
|
Original advisory text
Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp
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.
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.
References
- https://git.kernel.org/stable/c/291eec1041c918c460dc9702e44edd17794b4a4b URL
- https://git.kernel.org/stable/c/3c8eaa91eb433c450426539290be4ffe282e9f00 URL
- https://git.kernel.org/stable/c/41c2713b204e6cb6a94587bc6bf6935107df5479 URL
- https://git.kernel.org/stable/c/41e29548b5e8b5e5fcf708786b3bea67cab107fa URL
- https://git.kernel.org/stable/c/6319b38fe69f56ed95680ade485b957a53fff642 URL
- https://git.kernel.org/stable/c/d153b8898c0051eb8b6a083b35cbe304a5886bd5 URL
- https://git.kernel.org/stable/c/e6833e737a51db1e5ea0401322acf5e22abd8be6 URL
- https://git.kernel.org/stable/c/ecfed1e0d8efecad6737a0d83e21d2fd021d8c48 URL
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63975... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-63975 Vendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git Product
Internet-facing
14 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit (estimated)
- Gives an attacker full control (estimated)
Timeline
Published19 Jul 2026
Updated14 Aug 2026
First seen14 Aug 2026
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