{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38095",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38095"
  ],
  "published": "2025-07-03T07:44:56Z",
  "summary": "dma-buf: insert memory barrier before updating num_fences",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndma-buf: insert memory barrier before updating num_fences\n\nsmp_store_mb() inserts memory barrier after storing operation.\nIt is different with what the comment is originally aiming so Null\npointer dereference can be happened if memory update is reordered.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38095"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/90eb79c4ed98a4e24a62ccf61c199ab0f680fa8f"
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      "url": "https://git.kernel.org/stable/c/d0b7f11dd68b593bd970e5735be00e8d89bace30"
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      "url": "https://git.kernel.org/stable/c/3becc659f9cb76b481ad1fb71f54d5c8d6332d3f"
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      "url": "https://git.kernel.org/stable/c/c9d2b9a80d06a58f37e0dc8c827075639b443927"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fe1bebd0edb22e3536cbc920ec713331d1367ad4"
    },
    {
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      "url": "https://git.kernel.org/stable/c/08680c4dadc6e736c75bc2409d833f03f9003c51"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/72c7d62583ebce7baeb61acce6057c361f73be4a"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The race is driven entirely through local ioctls on a dma-buf or DRM render-node file descriptor (DMA_BUF_IOCTL_IMPORT_SYNC_FILE / EXPORT_SYNC_FILE / SYNC, and DRM_RENDER_ALLOW submit/wait/busy ioctls). No network or remote peer input reaches dma_resv_add_fence().\nAC:L - The attacker controls both sides of the race \u2014 one thread adds fences via DMA_BUF_IOCTL_IMPORT_SYNC_FILE while another iterates them locklessly via EXPORT_SYNC_FILE/SYNC \u2014 pinning threads to separate CPUs and looping indefinitely, and can groom the slab so the uninitialized slot holds a chosen value. The equivalent race was already demonstrated by the unprivileged igt/gem_busy/close-race testcase producing a GPF with slab poison, and affected weakly-ordered arm64 hardware is mainstream, not a rare configuration.\nPR:L - Only an unprivileged local user is needed: a dma-buf fd from /dev/dma_heap (accessible to every Android app) or a DRM render node (world/render-group accessible on desktops and containers with GPU passthrough), and all the relevant DRM ioctls are marked DRM_RENDER_ALLOW.\nUI:N - The attacker's own two threads perform both the fence addition and the lockless iteration on its own file descriptors. No victim action of any kind is required.\nS:U - The corruption occurs in kernel memory within the same security authority as the attacking process; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The reader dereferences an uninitialized/stale slab slot as a struct dma_fence *, giving reads at attacker-groomable addresses, and the bogus fence can be wrapped into a sync_file fd whose SYNC_IOC_FILE_INFO returns kernel-memory-derived strings and fields to userspace. Stale slots may also hold already-released fence pointers, a classic use-after-free read.\nI:H - kref_get_unless_zero() on the wild pointer performs an atomic increment at an attacker-influenced kernel address, and the subsequent dma_fence_is_signaled() makes an indirect call through fence->ops->signaled \u2014 an attacker-controlled function pointer \u2014 providing both a write primitive and control-flow hijack potential.\nA:H - The documented manifestations are a NULL pointer dereference (per the commit message) and a general protection fault from dereferencing garbage heap data (per the Fixes: commit's oops log), both of which panic or oops the kernel. The race can be re-triggered in a loop for repeated denial of service."
    }
  }
}