CVE-2025-68181 (GCVE-0-2025-68181)

Vulnerability from cvelistv5 – Published: 2025-12-16 13:42 – Updated: 2026-10-15 22:02
VLAI
Title
drm/radeon: Remove calls to drm_put_dev()
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/radeon: Remove calls to drm_put_dev() Since the allocation of the drivers main structure was changed to devm_drm_dev_alloc() drm_put_dev()'ing to trigger it to be free'd should be done by devres. However, drm_put_dev() is still in the probe error and device remove paths. When the driver fails to probe warnings like the following are shown because devres is trying to drm_put_dev() after the driver already did it. [ 5.642230] radeon 0000:01:05.0: probe with driver radeon failed with error -22 [ 5.649605] ------------[ cut here ]------------ [ 5.649607] refcount_t: underflow; use-after-free. [ 5.649620] WARNING: CPU: 0 PID: 357 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110 (cherry picked from commit 3eb8c0b4c091da0a623ade0d3ee7aa4a93df1ea4)
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:59 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6664 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a9ed2f052c5c14e4be58c5ec8794dffc87588123 , < 2fa41445d8c98f2a65503c373796466496edc0e7 (git)
Affected: a9ed2f052c5c14e4be58c5ec8794dffc87588123 , < ec18f6b2c743cc471b2539ddb5caed20a012e640 (git)
Affected: a9ed2f052c5c14e4be58c5ec8794dffc87588123 , < 745bae76acdd71709773c129a69deca01036250b (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.12.58 , ≤ 6.12.* (semver)
Unaffected: 6.17.8 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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                "id": "CVE-2025-68181",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/radeon: Remove calls to drm_put_dev()\n\nSince the allocation of the drivers main structure was changed to\ndevm_drm_dev_alloc() drm_put_dev()\u0027ing to trigger it to be free\u0027d\nshould be done by devres.\n\nHowever, drm_put_dev() is still in the probe error and device remove\npaths. When the driver fails to probe warnings like the following are\nshown because devres is trying to drm_put_dev() after the driver\nalready did it.\n\n[    5.642230] radeon 0000:01:05.0: probe with driver radeon failed with error -22\n[    5.649605] ------------[ cut here ]------------\n[    5.649607] refcount_t: underflow; use-after-free.\n[    5.649620] WARNING: CPU: 0 PID: 357 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110\n\n(cherry picked from commit 3eb8c0b4c091da0a623ade0d3ee7aa4a93df1ea4)"
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              "value": "AV:L - The vulnerable object is the radeon `drm_device`/`radeon_device` reached through local device nodes (`/dev/dri/card*`, `/dev/dri/renderD*`) and local driver bind/unbind/module teardown; there is no network-facing path into radeon_drv.c.\nAC:L - The double `drm_dev_put()` is unconditional on both the probe-error and `.remove` paths \u2014 no race to win and no memory layout the attacker cannot influence, and the attacker chooses when to touch the stale fd, giving an unbounded free-to-use window for heap grooming.\nPR:L - radeon declares `DRIVER_RENDER`, so any unprivileged local user can open the world-accessible render node and hold the `drm_dev_get()` reference whose premature release frees the object under their still-open fd, after which their own `ioctl`/`mmap`/`close` drives the use-after-free.\nUI:N - No victim action is needed \u2014 the attacker\u0027s own open fd plus a routine driver teardown (unbind, module reload, hot-unplug, or shutdown in a VM) is sufficient, and the freed object is then touched by the attacker\u0027s own syscalls.\nS:U - The corruption is confined to kernel heap memory within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The freed `radeon_device` container can be reclaimed by attacker-sprayed data and is then read back through `drm_ioctl()`/`dev-\u003edriver` and radeon\u0027s ioctl and postclose paths, yielding an arbitrary kernel-memory read primitive.\nI:H - `refcount_dec_and_test()` writes into freed memory, and `radeon_driver_postclose_kms()` writes `rdev-\u003ehyperz_filp`/`cmask_filp` and manipulates mutexes and VM state in the freed object, giving a write primitive and function-pointer control suitable for privilege escalation.\nA:H - The bug reliably produces a refcount underflow WARN and use-after-free on driver probe failure and on every device removal, causing kernel oops/panic and GPU subsystem failure."
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    "datePublished": "2025-12-16T13:42:59.600Z",
    "dateReserved": "2025-12-16T13:41:40.252Z",
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    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/radeon: Remove calls to drm_put_dev()\n\nSince the allocation of the drivers main structure was changed to\ndevm_drm_dev_alloc() drm_put_dev()\u0027ing to trigger it to be free\u0027d\nshould be done by devres.\n\nHowever, drm_put_dev() is still in the probe error and device remove\npaths. When the driver fails to probe warnings like the following are\nshown because devres is trying to drm_put_dev() after the driver\nalready did it.\n\n[    5.642230] radeon 0000:01:05.0: probe with driver radeon failed with error -22\n[    5.649605] ------------[ cut here ]------------\n[    5.649607] refcount_t: underflow; use-after-free.\n[    5.649620] WARNING: CPU: 0 PID: 357 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110\n\n(cherry picked from commit 3eb8c0b4c091da0a623ade0d3ee7aa4a93df1ea4)"
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndrm/radeon: Eliminar llamadas a drm_put_dev()\n\nDado que la asignaci\u00f3n de la estructura principal del controlador se cambi\u00f3 a devm_drm_dev_alloc(), la llamada a drm_put_dev() para activar su liberaci\u00f3n deber\u00eda ser realizada por devres.\n\nSin embargo, drm_put_dev() todav\u00eda est\u00e1 en las rutas de error de sondeo y eliminaci\u00f3n de dispositivos. Cuando el controlador falla al sondear, se muestran advertencias como las siguientes porque devres est\u00e1 intentando llamar a drm_put_dev() despu\u00e9s de que el controlador ya lo hizo.\n\n[    5.642230] radeon 0000:01:05.0: el sondeo con el controlador radeon fall\u00f3 con error -22\n[    5.649605] ------------[ cortar aqu\u00ed ]------------\n[    5.649607] refcount_t: desbordamiento inferior; uso despu\u00e9s de liberaci\u00f3n.\n[    5.649620] ADVERTENCIA: CPU: 0 PID: 357 en lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110\n\n(seleccionado de la confirmaci\u00f3n 3eb8c0b4c091da0a623ade0d3ee7aa4a93df1ea4)"
          }
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        "lastModified": "2026-10-15T22:19:09.670",
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                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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      "current_release_date": "2026-10-16T23:24:20+00:00",
      "cve": "CVE-2025-68181",
      "id": "CVE-2025-68181",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:known_affected": "199",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/radeon: Remove calls to drm_put_dev()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68181.json",
      "version": "3"
    }
  }
}



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