{"id":"DEBIAN-CVE-2026-99013","details":"In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: ISO: Reject concurrent BIS listener setup  iso_sock_listen() drops the socket lock before calling iso_listen_bis() to preserve the hdev-\u003elock ordering. Two concurrent listen() calls on the same broadcast socket can therefore both observe BT_BOUND. Caller A can attach connA and release the locks, then caller B can acquire them and attach connB before A publishes BT_LISTEN.  __iso_chan_add() checks whether connB already has a socket, but not whether the socket already has a connection. The second attachment overwrites iso_pi(sk)-\u003econn, leaking the connA reference and leaving connA-\u003esk intact. Socket teardown follows connB, so later events on connA can cause a stale socket access.  Recheck BT_BOUND and require iso_pi(sk)-\u003econn to be NULL after taking both the HCI device and socket locks in iso_listen_bis(). The connection check also covers the interval between attachment and publication of BT_LISTEN. Reject a competing setup with -EBADFD through the existing unlock path before allocating another connection.  A recorded KASAN report from an instrumented kernel shows:    BUG: KASAN: slab-use-after-free in iso_sock_hold+0x119/0x1f0   Call Trace:    iso_sock_hold+0x119/0x1f0    iso_conn_del+0xe4/0x270    hci_disconn_complete_evt+0x351/0x8c0    hci_event_packet+0x71b/0xb20    hci_rx_work+0x293/0x730    Allocated by task 93:    sk_prot_alloc+0x113/0x220    sk_alloc+0x2b/0x6d0    bt_sock_alloc+0x29/0x370    iso_sock_alloc.constprop.0+0x19/0x300    iso_sock_create+0x94/0x100    Freed by task 93:    kfree+0x121/0x3c0    __sk_destruct+0x42b/0x540    iso_sock_release+0x29d/0x340    __sock_release+0xa1/0x260    sock_close+0x10/0x20","modified":"2026-10-25T10:01:28.603317932Z","published":"2026-10-23T13:17:24.013Z","upstream":["CVE-2026-99013"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-99013"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.113-1"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.107-1","6.12.111-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1"],"ecosystem_specific":{"urgency":"not 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