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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-68188

Bluetooth: RFCOMM: Fix session UAF in set_termios

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: Fix session UAF in set_termios rfcomm_tty_set_termios() tests dlc->session without rfcomm_mutex and later passes the pointer to rfcomm_send_rpn(). The latter dereferences both session->initiator and session->sock. 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->session enter rfcomm_send_rpn() lock rfcomm_mutex clear dlc->session free session unlock rfcomm_mutex read session->initiator 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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 3a5e903c09aed19ca4a1bb26d87b8d6461a93818 to < 4eac4576a072084b06459de6c054b4ebc764b4eaaffected
  • 3a5e903c09aed19ca4a1bb26d87b8d6461a93818 to < 82c383f9031f1ce919ac6c3c06bc5bd492a6b078affected
  • 3a5e903c09aed19ca4a1bb26d87b8d6461a93818 to < c5c060597247131f90f39ea7c8c978fa0c2e79d0affected
  • 3a5e903c09aed19ca4a1bb26d87b8d6461a93818 to < 2894bd8c68e97accd758ca6e5fc375d7e9e8882caffected
  • 3a5e903c09aed19ca4a1bb26d87b8d6461a93818 to < a82a9d3891f5607030b0672c255087a12bb9837baffected
  • 3a5e903c09aed19ca4a1bb26d87b8d6461a93818 to < 780b04d09c941262ee2a2b4a09906451b69df8a6affected
  • 3a5e903c09aed19ca4a1bb26d87b8d6461a93818 to < 98bc68194e37bfa5e8ddc80b5c1eb0be4dc607eaaffected
  • 3a5e903c09aed19ca4a1bb26d87b8d6461a93818 to < c783399efc22d035443f1dfbf2a09bf9562aaa5eaffected

Linux Linux

Default version status: affected

  • 2.6.14affected
  • 0 to < 2.6.14unaffected
  • 5.10.265 to ≤ 5.10.*unaffected
  • 5.15.216 to ≤ 5.15.*unaffected
  • 6.1.183 to ≤ 6.1.*unaffected
  • 6.6.148 to ≤ 6.6.*unaffected
  • 6.12.101 to ≤ 6.12.*unaffected
  • 6.18.42 to ≤ 6.18.*unaffected
  • 7.1.6 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References