CVE-2025-21916 (GCVE-0-2025-21916)

Vulnerability from cvelistv5 – Published: 2025-04-01 15:40 – Updated: 2026-05-23 15:57
VLAI
Title
usb: atm: cxacru: fix a flaw in existing endpoint checks
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: atm: cxacru: fix a flaw in existing endpoint checks Syzbot once again identified a flaw in usb endpoint checking, see [1]. This time the issue stems from a commit authored by me (2eabb655a968 ("usb: atm: cxacru: fix endpoint checking in cxacru_bind()")). While using usb_find_common_endpoints() may usually be enough to discard devices with wrong endpoints, in this case one needs more than just finding and identifying the sufficient number of endpoints of correct types - one needs to check the endpoint's address as well. Since cxacru_bind() fills URBs with CXACRU_EP_CMD address in mind, switch the endpoint verification approach to usb_check_XXX_endpoints() instead to fix incomplete ep testing. [1] Syzbot report: usb 5-1: BOGUS urb xfer, pipe 3 != type 1 WARNING: CPU: 0 PID: 1378 at drivers/usb/core/urb.c:504 usb_submit_urb+0xc4e/0x18c0 drivers/usb/core/urb.c:503 ... RIP: 0010:usb_submit_urb+0xc4e/0x18c0 drivers/usb/core/urb.c:503 ... Call Trace: <TASK> cxacru_cm+0x3c8/0xe50 drivers/usb/atm/cxacru.c:649 cxacru_card_status drivers/usb/atm/cxacru.c:760 [inline] cxacru_bind+0xcf9/0x1150 drivers/usb/atm/cxacru.c:1223 usbatm_usb_probe+0x314/0x1d30 drivers/usb/atm/usbatm.c:1058 cxacru_usb_probe+0x184/0x220 drivers/usb/atm/cxacru.c:1377 usb_probe_interface+0x641/0xbb0 drivers/usb/core/driver.c:396 really_probe+0x2b9/0xad0 drivers/base/dd.c:658 __driver_probe_device+0x1a2/0x390 drivers/base/dd.c:800 driver_probe_device+0x50/0x430 drivers/base/dd.c:830 ...
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 23926d316d2836315cb113569f91393266eb5b47 , < dcd592ab9dd8a2bfc36e75583b9006db2a77ec24 (git)
Affected: 75ddbf776dd04a09fb9e5267ead5d0c989f84506 , < 319529e0356bd904528c64647725a2272d297c83 (git)
Affected: 1aac4be1aaa5177506219f01dce5e29194e5e95a , < bf4409f84023b52b5e9b36c0a071a121eee42138 (git)
Affected: 5584c776a1af7807ca815ee6265f2c1429fc5727 , < 197e78076c5ecd895f109158c4ea2954b9919af6 (git)
Affected: f536f09eb45e4de8d1b9accee9d992aa1846f1d4 , < a0475a885d69849b1ade38add6d64338dfa83a8f (git)
Affected: 2eabb655a968b862bc0c31629a09f0fbf3c80d51 , < cfc295f7cccf66cbd5123416bcf1bee2e1bd37de (git)
Affected: 2eabb655a968b862bc0c31629a09f0fbf3c80d51 , < 903b80c21458bb1e34c3a78c5fdc553821e357f8 (git)
Affected: 2eabb655a968b862bc0c31629a09f0fbf3c80d51 , < c90aad369899a607cfbc002bebeafd51e31900cd (git)
Affected: 5159a81924311c1ec786ad9fdef784ead8676a6a (git)
Affected: ac9007520e392541a29daebaae8b9109007bc781 (git)
Affected: 5.4.279 , < 5.4.291 (semver)
Affected: 5.10.221 , < 5.10.235 (semver)
Affected: 5.15.162 , < 5.15.179 (semver)
Affected: 6.1.97 , < 6.1.131 (semver)
Affected: 6.6.37 , < 6.6.83 (semver)
Affected: 4.19.317 , < 4.20 (semver)
Affected: 6.9.8 , < 6.10 (semver)
Create a notification for this product.
Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 5.4.291 , ≤ 5.4.* (semver)
Unaffected: 5.10.235 , ≤ 5.10.* (semver)
Unaffected: 5.15.179 , ≤ 5.15.* (semver)
Unaffected: 6.1.131 , ≤ 6.1.* (semver)
Unaffected: 6.6.83 , ≤ 6.6.* (semver)
Unaffected: 6.12.19 , ≤ 6.12.* (semver)
Unaffected: 6.13.7 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: atm: cxacru: fix a flaw in existing endpoint checks\n\nSyzbot once again identified a flaw in usb endpoint checking, see [1].\nThis time the issue stems from a commit authored by me (2eabb655a968\n(\"usb: atm: cxacru: fix endpoint checking in cxacru_bind()\")).\n\nWhile using usb_find_common_endpoints() may usually be enough to\ndiscard devices with wrong endpoints, in this case one needs more\nthan just finding and identifying the sufficient number of endpoints\nof correct types - one needs to check the endpoint\u0027s address as well.\n\nSince cxacru_bind() fills URBs with CXACRU_EP_CMD address in mind,\nswitch the endpoint verification approach to usb_check_XXX_endpoints()\ninstead to fix incomplete ep testing.\n\n[1] Syzbot report:\nusb 5-1: BOGUS urb xfer, pipe 3 != type 1\nWARNING: CPU: 0 PID: 1378 at drivers/usb/core/urb.c:504 usb_submit_urb+0xc4e/0x18c0 drivers/usb/core/urb.c:503\n...\nRIP: 0010:usb_submit_urb+0xc4e/0x18c0 drivers/usb/core/urb.c:503\n...\nCall Trace:\n \u003cTASK\u003e\n cxacru_cm+0x3c8/0xe50 drivers/usb/atm/cxacru.c:649\n cxacru_card_status drivers/usb/atm/cxacru.c:760 [inline]\n cxacru_bind+0xcf9/0x1150 drivers/usb/atm/cxacru.c:1223\n usbatm_usb_probe+0x314/0x1d30 drivers/usb/atm/usbatm.c:1058\n cxacru_usb_probe+0x184/0x220 drivers/usb/atm/cxacru.c:1377\n usb_probe_interface+0x641/0xbb0 drivers/usb/core/driver.c:396\n really_probe+0x2b9/0xad0 drivers/base/dd.c:658\n __driver_probe_device+0x1a2/0x390 drivers/base/dd.c:800\n driver_probe_device+0x50/0x430 drivers/base/dd.c:830\n..."
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    "dateUpdated": "2026-05-23T15:57:26.891Z",
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    "epss": {
      "cve": "CVE-2025-21916",
      "date": "2026-07-23",
      "epss": "0.002",
      "percentile": "0.10101"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21916\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-04-01T16:15:22.223\",\"lastModified\":\"2026-06-17T08:44:36.170\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nusb: atm: cxacru: fix a flaw in existing endpoint checks\\n\\nSyzbot once again identified a flaw in usb endpoint checking, see [1].\\nThis time the issue stems from a commit authored by me (2eabb655a968\\n(\\\"usb: atm: cxacru: fix endpoint checking in cxacru_bind()\\\")).\\n\\nWhile using usb_find_common_endpoints() may usually be enough to\\ndiscard devices with wrong endpoints, in this case one needs more\\nthan just finding and identifying the sufficient number of endpoints\\nof correct types - one needs to check the endpoint\u0027s address as well.\\n\\nSince cxacru_bind() fills URBs with CXACRU_EP_CMD address in mind,\\nswitch the endpoint verification approach to usb_check_XXX_endpoints()\\ninstead to fix incomplete ep testing.\\n\\n[1] Syzbot report:\\nusb 5-1: BOGUS urb xfer, pipe 3 != type 1\\nWARNING: CPU: 0 PID: 1378 at drivers/usb/core/urb.c:504 usb_submit_urb+0xc4e/0x18c0 drivers/usb/core/urb.c:503\\n...\\nRIP: 0010:usb_submit_urb+0xc4e/0x18c0 drivers/usb/core/urb.c:503\\n...\\nCall Trace:\\n \u003cTASK\u003e\\n cxacru_cm+0x3c8/0xe50 drivers/usb/atm/cxacru.c:649\\n cxacru_card_status drivers/usb/atm/cxacru.c:760 [inline]\\n cxacru_bind+0xcf9/0x1150 drivers/usb/atm/cxacru.c:1223\\n usbatm_usb_probe+0x314/0x1d30 drivers/usb/atm/usbatm.c:1058\\n cxacru_usb_probe+0x184/0x220 drivers/usb/atm/cxacru.c:1377\\n usb_probe_interface+0x641/0xbb0 drivers/usb/core/driver.c:396\\n really_probe+0x2b9/0xad0 drivers/base/dd.c:658\\n __driver_probe_device+0x1a2/0x390 drivers/base/dd.c:800\\n driver_probe_device+0x50/0x430 drivers/base/dd.c:830\\n...\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: atm: cxacru: corrige un fallo en las comprobaciones de endpoints existentes Syzbot volvi\u00f3 a identificar un fallo en la comprobaci\u00f3n de endpoints USB, consulte [1]. Esta vez, el problema se debe a una confirmaci\u00f3n de mi autor\u00eda (2eabb655a968 (\\\"usb: atm: cxacru: fix endpoint checking in cxacru_bind()\\\")). Si bien usar usb_find_common_endpoints() suele ser suficiente para descartar dispositivos con endpoints err\u00f3neos, en este caso se necesita m\u00e1s que simplemente encontrar e identificar la cantidad suficiente de endpoints de los tipos correctos: tambi\u00e9n se necesita comprobar la direcci\u00f3n del endpoint. Dado que cxacru_bind() rellena las URB teniendo en cuenta la direcci\u00f3n CXACRU_EP_CMD, cambie el enfoque de verificaci\u00f3n de endpoints a usb_check_XXX_endpoints() para corregir las pruebas de EP incompletas. [1] Informe de Syzbot: usb 5-1: transferencia de urb FALSA, canal 3 != tipo 1 ADVERTENCIA: CPU: 0 PID: 1378 en drivers/usb/core/urb.c:504 usb_submit_urb+0xc4e/0x18c0 drivers/usb/core/urb.c:503 ... RIP: 0010:usb_submit_urb+0xc4e/0x18c0 drivers/usb/core/urb.c:503 ... Seguimiento de llamadas  cxacru_cm+0x3c8/0xe50 drivers/usb/atm/cxacru.c:649 cxacru_card_status drivers/usb/atm/cxacru.c:760 [inline] cxacru_bind+0xcf9/0x1150 drivers/usb/atm/cxacru.c:1223 usbatm_usb_probe+0x314/0x1d30 drivers/usb/atm/usbatm.c:1058 cxacru_usb_probe+0x184/0x220 drivers/usb/atm/cxacru.c:1377 usb_probe_interface+0x641/0xbb0 drivers/usb/core/driver.c:396 really_probe+0x2b9/0xad0 drivers/base/dd.c:658 __driver_probe_device+0x1a2/0x390 drivers/base/dd.c:800 driver_probe_device+0x50/0x430 drivers/base/dd.c:830 ... 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:32:39+00:00",
      "cve": "CVE-2025-21916",
      "id": "CVE-2025-21916",
      "initial_release_date": "2025-04-01T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: atm: cxacru: fix a flaw in existing endpoint checks",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21916.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.