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
References
Impacted products
Vendor Product Version
Linux Linux Affected: dd08ebf6c3525a7ea2186e636df064ea47281987 , < b17fcce70733c211cb5dabf54f4f9491920b1d92 (git)
Affected: dd08ebf6c3525a7ea2186e636df064ea47281987 , < ba37807d08bae67de6139346a85650cab5f6145a (git)
Affected: dd08ebf6c3525a7ea2186e636df064ea47281987 , < 683b0e397dad9f26a42dcacf6f7f545a77ce6c06 (git)
Affected: dd08ebf6c3525a7ea2186e636df064ea47281987 , < 6bd90e700b4285e6a7541e00f969cab0d696adde (git)
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)
Create a notification for this product.
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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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      "cve": "CVE-2025-38703",
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      "title": "kernel: drm/xe: Make dma-fences compliant with the safe access rules",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38703",
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}



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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

Author Source Type Date Other

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.