CVE-2025-38394 (GCVE-0-2025-38394)
Vulnerability from cvelistv5
Published
2025-07-25 12:53
Modified
2025-07-28 04:20
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: HID: appletb-kbd: fix memory corruption of input_handler_list In appletb_kbd_probe an input handler is initialised and then registered with input core through input_register_handler(). When this happens input core will add the input handler (specifically its node) to the global input_handler_list. The input_handler_list is central to the functionality of input core and is traversed in various places in input core. An example of this is when a new input device is plugged in and gets registered with input core. The input_handler in probe is allocated as device managed memory. If a probe failure occurs after input_register_handler() the input_handler memory is freed, yet it will remain in the input_handler_list. This effectively means the input_handler_list contains a dangling pointer to data belonging to a freed input handler. This causes an issue when any other input device is plugged in - in my case I had an old PixArt HP USB optical mouse and I decided to plug it in after a failure occurred after input_register_handler(). This lead to the registration of this input device via input_register_device which involves traversing over every handler in the corrupted input_handler_list and calling input_attach_handler(), giving each handler a chance to bind to newly registered device. The core of this bug is a UAF which causes memory corruption of input_handler_list and to fix it we must ensure the input handler is unregistered from input core, this is done through input_unregister_handler(). [ 63.191597] ================================================================== [ 63.192094] BUG: KASAN: slab-use-after-free in input_attach_handler.isra.0+0x1a9/0x1e0 [ 63.192094] Read of size 8 at addr ffff888105ea7c80 by task kworker/0:2/54 [ 63.192094] [ 63.192094] CPU: 0 UID: 0 PID: 54 Comm: kworker/0:2 Not tainted 6.16.0-rc2-00321-g2aa6621d [ 63.192094] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.164 [ 63.192094] Workqueue: usb_hub_wq hub_event [ 63.192094] Call Trace: [ 63.192094] <TASK> [ 63.192094] dump_stack_lvl+0x53/0x70 [ 63.192094] print_report+0xce/0x670 [ 63.192094] kasan_report+0xce/0x100 [ 63.192094] input_attach_handler.isra.0+0x1a9/0x1e0 [ 63.192094] input_register_device+0x76c/0xd00 [ 63.192094] hidinput_connect+0x686d/0xad60 [ 63.192094] hid_connect+0xf20/0x1b10 [ 63.192094] hid_hw_start+0x83/0x100 [ 63.192094] hid_device_probe+0x2d1/0x680 [ 63.192094] really_probe+0x1c3/0x690 [ 63.192094] __driver_probe_device+0x247/0x300 [ 63.192094] driver_probe_device+0x49/0x210 [ 63.192094] __device_attach_driver+0x160/0x320 [ 63.192094] bus_for_each_drv+0x10f/0x190 [ 63.192094] __device_attach+0x18e/0x370 [ 63.192094] bus_probe_device+0x123/0x170 [ 63.192094] device_add+0xd4d/0x1460 [ 63.192094] hid_add_device+0x30b/0x910 [ 63.192094] usbhid_probe+0x920/0xe00 [ 63.192094] usb_probe_interface+0x363/0x9a0 [ 63.192094] really_probe+0x1c3/0x690 [ 63.192094] __driver_probe_device+0x247/0x300 [ 63.192094] driver_probe_device+0x49/0x210 [ 63.192094] __device_attach_driver+0x160/0x320 [ 63.192094] bus_for_each_drv+0x10f/0x190 [ 63.192094] __device_attach+0x18e/0x370 [ 63.192094] bus_probe_device+0x123/0x170 [ 63.192094] device_add+0xd4d/0x1460 [ 63.192094] usb_set_configuration+0xd14/0x1880 [ 63.192094] usb_generic_driver_probe+0x78/0xb0 [ 63.192094] usb_probe_device+0xaa/0x2e0 [ 63.192094] really_probe+0x1c3/0x690 [ 63.192094] __driver_probe_device+0x247/0x300 [ 63.192094] driver_probe_device+0x49/0x210 [ 63.192094] __device_attach_driver+0x160/0x320 [ 63.192094] bus_for_each_drv+0x10f/0x190 [ 63.192094] __device_attach+0x18e/0x370 [ 63.192094] bus_probe_device+0x123/0x170 [ 63.192094] device_add+0xd4d/0x1460 [ 63.192094] usb_new_device+0x7b4/0x1000 [ 63.192094] hub_event+0x234d/0x3 ---truncated---
References
Impacted products
Vendor Product Version
Linux Linux Version: 7d62ba8deacf94f546a0b9dd9bc86617343187a3
Version: 7d62ba8deacf94f546a0b9dd9bc86617343187a3
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-appletb-kbd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6ad40b07e15c29712d9a4b8096914ccd82e3fc17",
              "status": "affected",
              "version": "7d62ba8deacf94f546a0b9dd9bc86617343187a3",
              "versionType": "git"
            },
            {
              "lessThan": "c80f2b047d5cc42fbd2dff9d1942d4ba7545100f",
              "status": "affected",
              "version": "7d62ba8deacf94f546a0b9dd9bc86617343187a3",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-appletb-kbd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15.6",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: appletb-kbd: fix memory corruption of input_handler_list\n\nIn appletb_kbd_probe an input handler is initialised and then registered\nwith input core through input_register_handler(). When this happens input\ncore will add the input handler (specifically its node) to the global\ninput_handler_list. The input_handler_list is central to the functionality\nof input core and is traversed in various places in input core. An example\nof this is when a new input device is plugged in and gets registered with\ninput core.\n\nThe input_handler in probe is allocated as device managed memory. If a\nprobe failure occurs after input_register_handler() the input_handler\nmemory is freed, yet it will remain in the input_handler_list. This\neffectively means the input_handler_list contains a dangling pointer\nto data belonging to a freed input handler.\n\nThis causes an issue when any other input device is plugged in - in my\ncase I had an old PixArt HP USB optical mouse and I decided to\nplug it in after a failure occurred after input_register_handler().\nThis lead to the registration of this input device via\ninput_register_device which involves traversing over every handler\nin the corrupted input_handler_list and calling input_attach_handler(),\ngiving each handler a chance to bind to newly registered device.\n\nThe core of this bug is a UAF which causes memory corruption of\ninput_handler_list and to fix it we must ensure the input handler is\nunregistered from input core, this is done through\ninput_unregister_handler().\n\n[   63.191597] ==================================================================\n[   63.192094] BUG: KASAN: slab-use-after-free in input_attach_handler.isra.0+0x1a9/0x1e0\n[   63.192094] Read of size 8 at addr ffff888105ea7c80 by task kworker/0:2/54\n[   63.192094]\n[   63.192094] CPU: 0 UID: 0 PID: 54 Comm: kworker/0:2 Not tainted 6.16.0-rc2-00321-g2aa6621d\n[   63.192094] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.164\n[   63.192094] Workqueue: usb_hub_wq hub_event\n[   63.192094] Call Trace:\n[   63.192094]  \u003cTASK\u003e\n[   63.192094]  dump_stack_lvl+0x53/0x70\n[   63.192094]  print_report+0xce/0x670\n[   63.192094]  kasan_report+0xce/0x100\n[   63.192094]  input_attach_handler.isra.0+0x1a9/0x1e0\n[   63.192094]  input_register_device+0x76c/0xd00\n[   63.192094]  hidinput_connect+0x686d/0xad60\n[   63.192094]  hid_connect+0xf20/0x1b10\n[   63.192094]  hid_hw_start+0x83/0x100\n[   63.192094]  hid_device_probe+0x2d1/0x680\n[   63.192094]  really_probe+0x1c3/0x690\n[   63.192094]  __driver_probe_device+0x247/0x300\n[   63.192094]  driver_probe_device+0x49/0x210\n[   63.192094]  __device_attach_driver+0x160/0x320\n[   63.192094]  bus_for_each_drv+0x10f/0x190\n[   63.192094]  __device_attach+0x18e/0x370\n[   63.192094]  bus_probe_device+0x123/0x170\n[   63.192094]  device_add+0xd4d/0x1460\n[   63.192094]  hid_add_device+0x30b/0x910\n[   63.192094]  usbhid_probe+0x920/0xe00\n[   63.192094]  usb_probe_interface+0x363/0x9a0\n[   63.192094]  really_probe+0x1c3/0x690\n[   63.192094]  __driver_probe_device+0x247/0x300\n[   63.192094]  driver_probe_device+0x49/0x210\n[   63.192094]  __device_attach_driver+0x160/0x320\n[   63.192094]  bus_for_each_drv+0x10f/0x190\n[   63.192094]  __device_attach+0x18e/0x370\n[   63.192094]  bus_probe_device+0x123/0x170\n[   63.192094]  device_add+0xd4d/0x1460\n[   63.192094]  usb_set_configuration+0xd14/0x1880\n[   63.192094]  usb_generic_driver_probe+0x78/0xb0\n[   63.192094]  usb_probe_device+0xaa/0x2e0\n[   63.192094]  really_probe+0x1c3/0x690\n[   63.192094]  __driver_probe_device+0x247/0x300\n[   63.192094]  driver_probe_device+0x49/0x210\n[   63.192094]  __device_attach_driver+0x160/0x320\n[   63.192094]  bus_for_each_drv+0x10f/0x190\n[   63.192094]  __device_attach+0x18e/0x370\n[   63.192094]  bus_probe_device+0x123/0x170\n[   63.192094]  device_add+0xd4d/0x1460\n[   63.192094]  usb_new_device+0x7b4/0x1000\n[   63.192094]  hub_event+0x234d/0x3\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:20:59.258Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6ad40b07e15c29712d9a4b8096914ccd82e3fc17"
        },
        {
          "url": "https://git.kernel.org/stable/c/c80f2b047d5cc42fbd2dff9d1942d4ba7545100f"
        }
      ],
      "title": "HID: appletb-kbd: fix memory corruption of input_handler_list",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38394",
    "datePublished": "2025-07-25T12:53:39.017Z",
    "dateReserved": "2025-04-16T04:51:24.011Z",
    "dateUpdated": "2025-07-28T04:20:59.258Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38394\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-25T13:15:28.843\",\"lastModified\":\"2025-07-25T15:29:19.837\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nHID: appletb-kbd: fix memory corruption of input_handler_list\\n\\nIn appletb_kbd_probe an input handler is initialised and then registered\\nwith input core through input_register_handler(). When this happens input\\ncore will add the input handler (specifically its node) to the global\\ninput_handler_list. The input_handler_list is central to the functionality\\nof input core and is traversed in various places in input core. An example\\nof this is when a new input device is plugged in and gets registered with\\ninput core.\\n\\nThe input_handler in probe is allocated as device managed memory. If a\\nprobe failure occurs after input_register_handler() the input_handler\\nmemory is freed, yet it will remain in the input_handler_list. This\\neffectively means the input_handler_list contains a dangling pointer\\nto data belonging to a freed input handler.\\n\\nThis causes an issue when any other input device is plugged in - in my\\ncase I had an old PixArt HP USB optical mouse and I decided to\\nplug it in after a failure occurred after input_register_handler().\\nThis lead to the registration of this input device via\\ninput_register_device which involves traversing over every handler\\nin the corrupted input_handler_list and calling input_attach_handler(),\\ngiving each handler a chance to bind to newly registered device.\\n\\nThe core of this bug is a UAF which causes memory corruption of\\ninput_handler_list and to fix it we must ensure the input handler is\\nunregistered from input core, this is done through\\ninput_unregister_handler().\\n\\n[   63.191597] ==================================================================\\n[   63.192094] BUG: KASAN: slab-use-after-free in input_attach_handler.isra.0+0x1a9/0x1e0\\n[   63.192094] Read of size 8 at addr ffff888105ea7c80 by task kworker/0:2/54\\n[   63.192094]\\n[   63.192094] CPU: 0 UID: 0 PID: 54 Comm: kworker/0:2 Not tainted 6.16.0-rc2-00321-g2aa6621d\\n[   63.192094] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.164\\n[   63.192094] Workqueue: usb_hub_wq hub_event\\n[   63.192094] Call Trace:\\n[   63.192094]  \u003cTASK\u003e\\n[   63.192094]  dump_stack_lvl+0x53/0x70\\n[   63.192094]  print_report+0xce/0x670\\n[   63.192094]  kasan_report+0xce/0x100\\n[   63.192094]  input_attach_handler.isra.0+0x1a9/0x1e0\\n[   63.192094]  input_register_device+0x76c/0xd00\\n[   63.192094]  hidinput_connect+0x686d/0xad60\\n[   63.192094]  hid_connect+0xf20/0x1b10\\n[   63.192094]  hid_hw_start+0x83/0x100\\n[   63.192094]  hid_device_probe+0x2d1/0x680\\n[   63.192094]  really_probe+0x1c3/0x690\\n[   63.192094]  __driver_probe_device+0x247/0x300\\n[   63.192094]  driver_probe_device+0x49/0x210\\n[   63.192094]  __device_attach_driver+0x160/0x320\\n[   63.192094]  bus_for_each_drv+0x10f/0x190\\n[   63.192094]  __device_attach+0x18e/0x370\\n[   63.192094]  bus_probe_device+0x123/0x170\\n[   63.192094]  device_add+0xd4d/0x1460\\n[   63.192094]  hid_add_device+0x30b/0x910\\n[   63.192094]  usbhid_probe+0x920/0xe00\\n[   63.192094]  usb_probe_interface+0x363/0x9a0\\n[   63.192094]  really_probe+0x1c3/0x690\\n[   63.192094]  __driver_probe_device+0x247/0x300\\n[   63.192094]  driver_probe_device+0x49/0x210\\n[   63.192094]  __device_attach_driver+0x160/0x320\\n[   63.192094]  bus_for_each_drv+0x10f/0x190\\n[   63.192094]  __device_attach+0x18e/0x370\\n[   63.192094]  bus_probe_device+0x123/0x170\\n[   63.192094]  device_add+0xd4d/0x1460\\n[   63.192094]  usb_set_configuration+0xd14/0x1880\\n[   63.192094]  usb_generic_driver_probe+0x78/0xb0\\n[   63.192094]  usb_probe_device+0xaa/0x2e0\\n[   63.192094]  really_probe+0x1c3/0x690\\n[   63.192094]  __driver_probe_device+0x247/0x300\\n[   63.192094]  driver_probe_device+0x49/0x210\\n[   63.192094]  __device_attach_driver+0x160/0x320\\n[   63.192094]  bus_for_each_drv+0x10f/0x190\\n[   63.192094]  __device_attach+0x18e/0x370\\n[   63.192094]  bus_probe_device+0x123/0x170\\n[   63.192094]  device_add+0xd4d/0x1460\\n[   63.192094]  usb_new_device+0x7b4/0x1000\\n[   63.192094]  hub_event+0x234d/0x3\\n---truncated---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6ad40b07e15c29712d9a4b8096914ccd82e3fc17\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c80f2b047d5cc42fbd2dff9d1942d4ba7545100f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.