{"id":"CVE-2026-80914","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-80914","summary":"Bluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready\n\niso_conn_ready() looks up the BIS listener socket with iso_get_sock(),\nwhich takes a reference, and then, without re-checking its state,\ncreates a child socket from it:\n\n    parent = iso_get_sock(hdev, ...);\n    if (!parent)\n        return;\n\n    lock_sock(parent);\n    sk = iso_sock_alloc(sock_net(parent), NULL, BTPROTO_ISO, ...);\n    ...\n    iso_chan_add(conn, sk, parent);\n    ...\n    release_sock(parent);\n    sock_put(parent);\n\nIf the listener socket is closed concurrently, between iso_get_sock()\nand lock_sock(), the reference taken by iso_get_sock() may be the last\none: the close path drops the link-list reference, and once\niso_conn_ready() drops its own reference at the end of the function the\nsocket is freed.  The child socket, however, is already linked to the\nfreed parent, and a later disconnect of the child runs iso_chan_del()\n-> bt_accept_unlink(), which dereferences the dangling parent pointer\ninto the freed accept queue (a use-after-free).  The same dangling\npointer is also dereferenced through parent->***() in\niso_chan_del().\n\nFix it the same way the connected (non-BIS) path was fixed in commit\n0d255e63fcf3 (\"Bluetooth: ISO: hold sk properly in iso_conn_ready\"):\nafter taking the socket lock, re-check that the parent is still a\nlistening, alive socket, and bail out otherwise.","published":"2026-09-09T16:10:58.675Z","modified":"2026-09-11T03:49:00.211215644Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.12.109"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/03288b7447c9e572f8ab82fc29cfb4ca719ab210"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2387cd06a2c0b416f05028b02bba1089f54c28d9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/49fd7116f76b860b230843700fb7423ab5331e1f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/560bef609fa5992745929e8d7d458b9d88dd2830"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80914.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80914"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-11T03:49:00.211215644Z"}}