{"id":"CVE-2026-98107","published":"2026-09-25T11:17:41.743","lastModified":"2026-09-25T11:17:41.743","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: fix out-of-bounds write in l2cap_ecred_connect\n\nl2cap_chan_connect() tries to ensure there are no more than\nL2CAP_ECRED_CONN_SCID_MAX pending ECRED channels, so they fit in the\nsame L2CAP_ECRED_CONN_REQ that l2cap_ecred_connect() constructs.\n\nHowever, the check only counts deferred channels.  If 6 L2CAP sockets\nare connected at the same time in order DDDDND (D=deferred,\nN=non-deferred), the last can bump the total to max+1.  It results to\none __le16 written out of bounds of the scid array, and an invalid\nECRED_CONN_REQ being sent.\n\nFix by leaving room for the non-deferred pending ECRED channels in the\ncounting in l2cap_chan_connect(), so the limit can't be exceeded.\n\nMove counting under same critical section where the channel is added.\nAlthough race conditions involving this appear unreachable, it's easier\nto see.\n\nAlso add WARN_ON_ONCE check in l2cap_ecred_defer_connect() to make this\nless brittle.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/56c2b5831d39dc84aad2573dc3e197af1a872a05","tags":[]},{"url":"https://git.kernel.org/stable/c/6da5c0331fc3ef0c7b8df8269523fc3b2cce1e65","tags":[]},{"url":"https://git.kernel.org/stable/c/ce0927eb3ee2939fab5ce3f9334bfd2fafb38481","tags":[]},{"url":"https://git.kernel.org/stable/c/df8c3af6132640da4788e96a02d653e642059803","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}