← CVE Intelligence

CVE-2026-98107

Bluetooth: L2CAP: fix out-of-bounds write in l2cap_ecred_connect PUBLISHED

Description (CNA)

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: fix out-of-bounds write in l2cap_ecred_connect l2cap_chan_connect() tries to ensure there are no more than L2CAP_ECRED_CONN_SCID_MAX pending ECRED channels, so they fit in the same L2CAP_ECRED_CONN_REQ that l2cap_ecred_connect() constructs. However, the check only counts deferred channels. If 6 L2CAP sockets are connected at the same time in order DDDDND (D=deferred, N=non-deferred), the last can bump the total to max+1. It results to one __le16 written out of bounds of the scid array, and an invalid ECRED_CONN_REQ being sent. Fix by leaving room for the non-deferred pending ECRED channels in the counting in l2cap_chan_connect(), so the limit can't be exceeded. Move counting under same critical section where the channel is added. Although race conditions involving this appear unreachable, it's easier to see. Also add WARN_ON_ONCE check in l2cap_ecred_defer_connect() to make this less brittle.

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected da49b602f7f75ccc91386e1274b3ef71676cd092 before fabc5e04f123225daf980d03f2c5a05e7f0f0a7f; affected da49b602f7f75ccc91386e1274b3ef71676cd092 before ce0927eb3ee2939fab5ce3f9334bfd2fafb38481; affected da49b602f7f75ccc91386e1274b3ef71676cd092 before 6da5c0331fc3ef0c7b8df8269523fc3b2cce1e65; affected da49b602f7f75ccc91386e1274b3ef71676cd092 before df8c3af6132640da4788e96a02d653e642059803; affected da49b602f7f75ccc91386e1274b3ef71676cd092 before 56c2b5831d39dc84aad2573dc3e197af1a872a05
Linux / Linuxaffected 5.7; unaffected 0 before 5.7; unaffected 6.6.160 through 6.6.*; unaffected 6.12.111 through 6.12.*; unaffected 6.18.53 through 6.18.*; unaffected 7.2.7 through 7.2.*; unaffected 7.3 through *

CWE

No CWE identifiers supplied.

References