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CVE-2025-37800 (GCVE-0-2025-37800)

Vulnerability from cvelistv5 – Published: 2025-05-08 06:26 – Updated: 2026-08-05 11:57
VLAI
Title
driver core: fix potential NULL pointer dereference in dev_uevent()
Summary
In the Linux kernel, the following vulnerability has been resolved: driver core: fix potential NULL pointer dereference in dev_uevent() If userspace reads "uevent" device attribute at the same time as another threads unbinds the device from its driver, change to dev->driver from a valid pointer to NULL may result in crash. Fix this by using READ_ONCE() when fetching the pointer, and take bus' drivers klist lock to make sure driver instance will not disappear while we access it. Use WRITE_ONCE() when setting the driver pointer to ensure there is no tearing.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 16574dccd8f62dc1b585325f8a6a0aab10047ed8 , < abe56be73eb10a677d16066f65ff9d30251f5eee (git)
Affected: 16574dccd8f62dc1b585325f8a6a0aab10047ed8 , < 2b344e779d9afd0fcb5ee4000e4d0fc7d8d867eb (git)
Affected: 16574dccd8f62dc1b585325f8a6a0aab10047ed8 , < 3781e4b83e174364998855de777e184cf0b62c40 (git)
Affected: 16574dccd8f62dc1b585325f8a6a0aab10047ed8 , < 18daa52418e7e4629ed1703b64777294209d2622 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.22
Unaffected: 0 , < 2.6.22 (semver)
Unaffected: 6.6.89 , ≤ 6.6.* (semver)
Unaffected: 6.12.26 , ≤ 6.12.* (semver)
Unaffected: 6.14.5 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "value": "AV:L - The vulnerable code is reached by read(2) on a sysfs file (`/sys/devices/**/uevent`) and the racing unbind via ioctl on `/dev/bus/usb/*`, both requiring a local account on the system. There is no network-facing path into `dev_uevent()`.\nAC:L - The attacker controls both sides of the race: an unprivileged thread spins reading the world-readable `uevent` attribute while another thread toggles `USBDEVFS_DISCONNECT`/`USBDEVFS_CONNECT` (or CLAIM/RELEASE_INTERFACE) on the same USB interface, driving `dev-\u003edriver` between a valid pointer and NULL at will. No condition depends on state outside the attacker\u0027s influence, and the window can be retried indefinitely at high rate.\nPR:L - `dev_attr_uevent` is DEVICE_ATTR_RW (0644), so any unprivileged local user can read it, and the usbfs disconnect/connect ioctls have no `capable()` check \u2014 only rw access to a `/dev/bus/usb` node, which udev `uaccess` rules routinely grant to the logged-in seat user. No root or capability is required.\nUI:N - The attacker performs both the sysfs read and the driver unbind from their own processes; no victim action is needed. On kiosk-style systems the routine hotplug churn that also triggers it happens without any deliberate user step.\nS:U - The fault and its consequences are confined to the kernel of the same host; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - If the driver is unregistered and its module unloaded after the pointer is loaded, `drv-\u003ename` is read from freed memory and the resulting dangling `char *` is expanded by `add_uevent_var(env, \"DRIVER=%s\", ...)` into the env buffer that `uevent_show()` copies back to the unprivileged reader \u2014 a use-after-free read that leaks arbitrary kernel memory contents to userspace. The fix\u0027s klist_drivers lock exists specifically to stop the driver structure disappearing mid-read.\nI:N - The racy path only loads `dev-\u003edriver` and formats `drv-\u003ename` into a bounded, kernel-allocated uevent buffer; it performs no attacker-influenced write to kernel memory and yields no control-flow hijack primitive.\nA:H - Reloading `dev-\u003edriver` as NULL makes `dev-\u003edriver-\u003ename` a NULL-page dereference, and the freed-module variant faults on unmapped vmalloc memory \u2014 either way an oops in the driver-core read path, repeatable at will for a reliable local denial of service."
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    "dateReserved": "2025-04-16T04:51:23.941Z",
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      "status": "final",
      "title": "driver core: fix potential NULL pointer dereference in dev_uevent()",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-37800.json",
      "version": "7"
    },
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Fix this by using READ_ONCE()\\nwhen fetching the pointer, and take bus\u0027 drivers klist lock to make sure\\ndriver instance will not disappear while we access it.\\n\\nUse WRITE_ONCE() when setting the driver pointer to ensure there is no\\ntearing.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: n\u00facleo del controlador: se corrige una posible desreferencia de puntero nulo en dev_uevent(). Si el espacio de usuario lee el atributo de dispositivo \\\"uevent\\\" al mismo tiempo que otro subproceso desvincula el dispositivo de su controlador, cambiar de un puntero v\u00e1lido a nulo en dev-\u0026gt;driver puede provocar un fallo. Se soluciona esto usando READ_ONCE() al obtener el puntero y bloqueando la lista de k de los controladores del bus para garantizar que la instancia del controlador no desaparezca al acceder a ella. 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    "redhat_vex": {
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      "current_release_date": "2026-07-30T09:29:22+00:00",
      "cve": "CVE-2025-37800",
      "id": "CVE-2025-37800",
      "initial_release_date": "2025-05-08T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: driver core: fix potential NULL pointer dereference in dev_uevent()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-37800.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-29T01:21:42Z",
      "cve": "CVE-2025-37800",
      "id": "CVE-2025-37800",
      "initial_release_date": "2025-05-08T11:40:24Z",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "380",
      "product_status:recommended": "433",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-37800",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-37800.json",
      "version": "40"
    }
  }
}



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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.


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