CVE-2025-38703 (GCVE-0-2025-38703)

Vulnerability from cvelistv5 – Published: 2025-09-04 15:32 – Updated: 2026-08-05 12:04
VLAI
Title
drm/xe: Make dma-fences compliant with the safe access rules
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/xe: Make dma-fences compliant with the safe access rules Xe can free some of the data pointed to by the dma-fences it exports. Most notably the timeline name can get freed if userspace closes the associated submit queue. At the same time the fence could have been exported to a third party (for example a sync_fence fd) which will then cause an use- after-free on subsequent access. To make this safe we need to make the driver compliant with the newly documented dma-fence rules. Driver has to ensure a RCU grace period between signalling a fence and freeing any data pointed to by said fence. For the timeline name we simply make the queue be freed via kfree_rcu and for the shared lock associated with multiple queues we add a RCU grace period before freeing the per GT structure holding the lock.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7034 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: dd08ebf6c3525a7ea2186e636df064ea47281987 , < b17fcce70733c211cb5dabf54f4f9491920b1d92 (git)
Affected: dd08ebf6c3525a7ea2186e636df064ea47281987 , < ba37807d08bae67de6139346a85650cab5f6145a (git)
Affected: dd08ebf6c3525a7ea2186e636df064ea47281987 , < 683b0e397dad9f26a42dcacf6f7f545a77ce6c06 (git)
Affected: dd08ebf6c3525a7ea2186e636df064ea47281987 , < 6bd90e700b4285e6a7541e00f969cab0d696adde (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.12.43 , ≤ 6.12.* (semver)
Unaffected: 6.15.11 , ≤ 6.15.* (semver)
Unaffected: 6.16.2 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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              "value": "AV:L - The attack requires ioctls on the local DRM render node (`/dev/dri/renderD128`) plus a sync_file fd; there is no remote or adjacent-network path to the xe exec-queue lifecycle.\nAC:L - No race is involved \u2014 once `kfree(ge)` runs the dangling `fence-\u003esched` pointer is permanently stale, so the attacker controls every step (create queue, export sync_file, destroy queue, spray the slab at leisure, then read) and can retry indefinitely.\nPR:L - All required ioctls (XE_EXEC_QUEUE_CREATE/DESTROY, XE_EXEC, SYNCOBJ_EXPORT_SYNC_FILE, SYNC_IOC_FILE_INFO) are `DRM_RENDER_ALLOW` with no `DRM_AUTH` or capability check, so any local user with render-node access \u2014 the default for logged-in desktop users, Android/ChromeOS apps, and GPU-passthrough containers \u2014 can exploit it.\nUI:N - The attacker performs the entire sequence within its own process using its own exec queue and its own exported fence; no victim action is needed.\nS:U - The use-after-free occurs in kernel slab memory and the impact stays within the kernel\u0027s security authority \u2014 no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - `sync_fill_fence_info()` `strscpy()`s from the UAF-derived `name` pointer into `info-\u003eobj_name` and copies it to userspace, so after heap-spraying the freed `xe_guc_exec_queue` slot the attacker controls that pointer and obtains a repeatable arbitrary kernel-memory read primitive.\nI:H - This is a use-after-free of a slab object whose contents the attacker can groom, and the companion `fence-\u003elock` defect makes `spin_lock()` write into the freed `struct xe_gt`, giving corruption of reallocated kernel objects that is leverageable for control-flow hijack.\nA:H - Dereferencing the stale `fence-\u003esched` and the resulting wild `name` pointer readily oopses the kernel, and locking a freed `fence-\u003elock` corrupts or deadlocks unrelated allocations, each producing a full system crash."
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    "dateReserved": "2025-04-16T04:51:24.032Z",
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        "descriptions": [
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe: Make dma-fences compliant with the safe access rules\n\nXe can free some of the data pointed to by the dma-fences it exports. Most\nnotably the timeline name can get freed if userspace closes the associated\nsubmit queue. At the same time the fence could have been exported to a\nthird party (for example a sync_fence fd) which will then cause an use-\nafter-free on subsequent access.\n\nTo make this safe we need to make the driver compliant with the newly\ndocumented dma-fence rules. Driver has to ensure a RCU grace period\nbetween signalling a fence and freeing any data pointed to by said fence.\n\nFor the timeline name we simply make the queue be freed via kfree_rcu and\nfor the shared lock associated with multiple queues we add a RCU grace\nperiod before freeing the per GT structure holding the lock."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndrm/xe: Hacer que las dma-fences cumplan con las reglas de acceso seguro\n\nXe puede liberar algunos de los datos a los que apuntan las dma-fences que exporta. En particular, el nombre de la l\u00ednea de tiempo puede ser liberado si el espacio de usuario cierra la cola de env\u00edo asociada. Al mismo tiempo, la fence podr\u00eda haber sido exportada a un tercero (por ejemplo, un fd de sync_fence) lo que luego causar\u00e1 un use-after-free en accesos posteriores.\n\nPara que esto sea seguro, necesitamos hacer que el controlador cumpla con las reglas de dma-fence recientemente documentadas. El controlador debe asegurar un per\u00edodo de gracia RCU entre la se\u00f1alizaci\u00f3n de una fence y la liberaci\u00f3n de cualquier dato al que apunte dicha fence.\n\nPara el nombre de la l\u00ednea de tiempo, simplemente hacemos que la cola sea liberada a trav\u00e9s de kfree_rcu y para el bloqueo compartido asociado con m\u00faltiples colas, a\u00f1adimos un per\u00edodo de gracia RCU antes de liberar la estructura por GT que contiene el bloqueo."
          }
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        "id": "CVE-2025-38703",
        "lastModified": "2026-10-19T21:10:00.160",
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        "vulnStatus": "Modified",
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      "current_release_date": "2026-07-30T09:02:37+00:00",
      "cve": "CVE-2025-38703",
      "id": "CVE-2025-38703",
      "initial_release_date": "2025-09-04T00:00:00+00:00",
      "product_status:fixed": "1224",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/xe: Make dma-fences compliant with the safe access rules",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38703.json",
      "version": "3"
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  }
}



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