{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68367",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-68367"
  ],
  "published": "2026-08-10T12:08:00Z",
  "summary": "usb: gadget: f_tcm: synchronize delayed set_alt with teardown",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_tcm: synchronize delayed set_alt with teardown\n\nThe f_tcm set_alt() path defers endpoint setup to a work item and\ncompletes the delayed status response from process context. The delayed\nwork uses f_tcm private state and may complete the setup request after\ndisconnect or function teardown has already moved on.\n\nCancel and drain the delayed set_alt work when the function is unbound or\nfreed. For disable paths, which are reached under the composite device\nlock, use a small state machine and a non-sleeping cancellation path\ninstead of cancel_work_sync(). If the work is already running, mark it\ncancelled and let the worker own the cleanup; otherwise tcm_disable() can\ncancel the queued work and clean up immediately.\n\nAlso serialize the final delayed-status completion with the cancellation\ncheck while holding the composite device lock. This prevents a disconnect\nfrom clearing delayed_status while the worker is about to complete the\ncontrol request.\n\nValidation reproduced this kernel report:\nBUG: KASAN: slab-use-after-free in tcm_delayed_set_alt+0x6c/0xef0\n\nCall Trace:\n <TASK>\n dump_stack_lvl+0x66/0xa0\n print_report+0xce/0x630\n ? tcm_delayed_set_alt+0x6c/0xef0\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? __virt_addr_valid+0x188/0x320\n ? tcm_delayed_set_alt+0x6c/0xef0\n kasan_report+0xe0/0x110\n ? tcm_delayed_set_alt+0x6c/0xef0\n tcm_delayed_set_alt+0x6c/0xef0\n ? __pfx_tcm_delayed_set_alt+0x10/0x10\n ? process_one_work+0x4cb/0xb90\n ? rcu_is_watching+0x20/0x50\n ? tcm_delayed_set_alt+0x9/0xef0\n process_one_work+0x4d7/0xb90\n ? __pfx_process_one_work+0x10/0x10\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? __list_add_valid_or_report+0x37/0xf0\n ? __pfx_tcm_delayed_set_alt+0x10/0x10\n ? srso_alias_return_thunk+0x5/0xfbef5\n worker_thread+0x2d8/0x570\n ? __pfx_worker_thread+0x10/0x10\n kthread+0x1ad/0x1f0\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x3c9/0x540\n ? __pfx_ret_from_fork+0x10/0x10\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? __switch_to+0x2e9/0x730\n ? __pfx_kthread+0x10/0x10\n ret_from_fork_asm+0x1a/0x30\n </TASK>\n\nAllocated by task 544:\n kasan_save_stack+0x33/0x60\n kasan_save_track+0x14/0x30\n __kasan_kmalloc+0x8f/0xa0\n tcm_alloc+0x68/0x180\n usb_get_function+0x36/0x60\n config_usb_cfg_link+0x125/0x1b0\n configfs_symlink+0x322/0x890\n vfs_symlink+0xc2/0x270\n filename_symlinkat+0x295/0x2f0\n __x64_sys_symlinkat+0x62/0x90\n do_syscall_64+0x115/0x6a0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFreed by task 661:\n kasan_save_stack+0x33/0x60\n kasan_save_track+0x14/0x30\n kasan_save_free_info+0x3b/0x60\n __kasan_slab_free+0x43/0x70\n kfree+0x2f9/0x530\n config_usb_cfg_unlink+0x173/0x1e0\n configfs_unlink+0x1fa/0x340\n vfs_unlink+0x15c/0x510\n filename_unlinkat+0x2ba/0x450\n __x64_sys_unlinkat+0x63/0x90\n do_syscall_64+0x115/0x6a0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.184",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-68367"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8fb317058d165c88f3344f59439c14872c162b3c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/90431d8523c0c1c9f8e3e3f0895727063f93da85"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ee07d09419f1c59c74f73107aa08444f2f2fc6c8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3118bb872c7dff653294f193d5328a476619e04d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a6eb5a0ae7cd313cfd7df78decd8f43b64c68703"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f282242906c12fd476b86757afba51f211d4f959"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4c6c6a5588b9a2f8437fb794e852d05fa60ebe53"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/79e2d75725c85607f8a9d87ae9cace62a19f767d"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-23T12:46:35Z"
  }
}