{"id":"DEBIAN-CVE-2026-68188","details":"In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: RFCOMM: Fix session UAF in set_termios  rfcomm_tty_set_termios() tests dlc-\u003esession without rfcomm_mutex and later passes the pointer to rfcomm_send_rpn(). The latter dereferences both session-\u003einitiator and session-\u003esock. Meanwhile, krfcommd can unlink the DLC and free the session while holding rfcomm_mutex.  The race can proceed as follows:    TTY ioctl task                 krfcommd   --------------                 --------   load dlc-\u003esession   enter rfcomm_send_rpn()                                  lock rfcomm_mutex                                  clear dlc-\u003esession                                  free session                                  unlock rfcomm_mutex   read session-\u003einitiator  KASAN reported:    BUG: KASAN: slab-use-after-free in rfcomm_send_rpn+0x297/0x2a0   Read of size 4 at addr ffff88810012a850 by task poc/92    Call Trace:    rfcomm_send_rpn+0x297/0x2a0    rfcomm_tty_set_termios+0x50d/0x850    tty_set_termios+0x596/0x950    set_termios+0x46a/0x6e0    tty_mode_ioctl+0x152/0xbd0    tty_ioctl+0x915/0x1240    __x64_sys_ioctl+0x134/0x1c0    Allocated by task 92:    rfcomm_session_add+0x9e/0x2e0    rfcomm_dlc_open+0x8b1/0xe00    rfcomm_dev_activate+0x85/0x1a0    rfcomm_tty_open+0x90/0x280    Freed by task 68:    kfree+0x131/0x3c0    rfcomm_session_del+0x119/0x180    rfcomm_run+0x737/0x4710  Add rfcomm_dlc_send_rpn(), which holds rfcomm_mutex while it verifies that the DLC is still attached and sends the RPN frame. Have the TTY path use the helper and drop its unlocked session check. This keeps the session valid through both the frame construction and socket send.","modified":"2026-09-08T17:00:25.016631102Z","published":"2026-08-10T13:20:06.020Z","upstream":["CVE-2026-68188"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-68188"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.187-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.176-1","6.1.177-1","6.1.180-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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