{"id":"DEBIAN-CVE-2026-68367","details":"In the Linux kernel, the following vulnerability has been resolved:  usb: gadget: f_tcm: synchronize delayed set_alt with teardown  The f_tcm set_alt() path defers endpoint setup to a work item and completes the delayed status response from process context. The delayed work uses f_tcm private state and may complete the setup request after disconnect or function teardown has already moved on.  Cancel and drain the delayed set_alt work when the function is unbound or freed. For disable paths, which are reached under the composite device lock, use a small state machine and a non-sleeping cancellation path instead of cancel_work_sync(). If the work is already running, mark it cancelled and let the worker own the cleanup; otherwise tcm_disable() can cancel the queued work and clean up immediately.  Also serialize the final delayed-status completion with the cancellation check while holding the composite device lock. This prevents a disconnect from clearing delayed_status while the worker is about to complete the control request.  Validation reproduced this kernel report: BUG: KASAN: slab-use-after-free in tcm_delayed_set_alt+0x6c/0xef0  Call Trace:  \u003cTASK\u003e  dump_stack_lvl+0x66/0xa0  print_report+0xce/0x630  ? tcm_delayed_set_alt+0x6c/0xef0  ? srso_alias_return_thunk+0x5/0xfbef5  ? __virt_addr_valid+0x188/0x320  ? tcm_delayed_set_alt+0x6c/0xef0  kasan_report+0xe0/0x110  ? tcm_delayed_set_alt+0x6c/0xef0  tcm_delayed_set_alt+0x6c/0xef0  ? __pfx_tcm_delayed_set_alt+0x10/0x10  ? process_one_work+0x4cb/0xb90  ? rcu_is_watching+0x20/0x50  ? tcm_delayed_set_alt+0x9/0xef0  process_one_work+0x4d7/0xb90  ? __pfx_process_one_work+0x10/0x10  ? srso_alias_return_thunk+0x5/0xfbef5  ? __list_add_valid_or_report+0x37/0xf0  ? __pfx_tcm_delayed_set_alt+0x10/0x10  ? srso_alias_return_thunk+0x5/0xfbef5  worker_thread+0x2d8/0x570  ? __pfx_worker_thread+0x10/0x10  kthread+0x1ad/0x1f0  ? __pfx_kthread+0x10/0x10  ret_from_fork+0x3c9/0x540  ? __pfx_ret_from_fork+0x10/0x10  ? srso_alias_return_thunk+0x5/0xfbef5  ? __switch_to+0x2e9/0x730  ? __pfx_kthread+0x10/0x10  ret_from_fork_asm+0x1a/0x30  \u003c/TASK\u003e  Allocated by task 544:  kasan_save_stack+0x33/0x60  kasan_save_track+0x14/0x30  __kasan_kmalloc+0x8f/0xa0  tcm_alloc+0x68/0x180  usb_get_function+0x36/0x60  config_usb_cfg_link+0x125/0x1b0  configfs_symlink+0x322/0x890  vfs_symlink+0xc2/0x270  filename_symlinkat+0x295/0x2f0  __x64_sys_symlinkat+0x62/0x90  do_syscall_64+0x115/0x6a0  entry_SYSCALL_64_after_hwframe+0x77/0x7f  Freed by task 661:  kasan_save_stack+0x33/0x60  kasan_save_track+0x14/0x30  kasan_save_free_info+0x3b/0x60  __kasan_slab_free+0x43/0x70  kfree+0x2f9/0x530  config_usb_cfg_unlink+0x173/0x1e0  configfs_unlink+0x1fa/0x340  vfs_unlink+0x15c/0x510  filename_unlinkat+0x2ba/0x450  __x64_sys_unlinkat+0x63/0x90  do_syscall_64+0x115/0x6a0  entry_SYSCALL_64_after_hwframe+0x77/0x7f","modified":"2026-09-19T22:01:45.932651810Z","published":"2026-08-10T13:20:29.353Z","upstream":["CVE-2026-68367"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-68367"}],"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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