{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89940",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89940"
  ],
  "published": "2026-09-16T10:32:03Z",
  "summary": "iio: buffer: Tie IIO dma fence lock lifetime to the fence",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: buffer: Tie IIO dma fence lock lifetime to the fence\n\nThe `iio_dma_fence` implementation currently uses a lock embedded in the\n`iio_dmabuf_priv`. But the `iio_dma_fence` can outlive the\n`iio_dmabuf_priv`, which can cause a use-after-free.\n\nTie the lifetime of the lock to the lifetime of the fence by embedding them\nin the same struct.\n\nWe can't just hold a reference to the `iio_dmabuf_priv` from the\n`iio_dma_fence` since `iio_buffer_dmabuf_release()` might sleep and the\nfence release callback is not allowed to sleep.\n\nNote that the `dma_fence` framework now has an internal lock that gets used\nwhen the passing `NULL` for `lock` in `dma_fence_init()`, but in order to\nallow this patch to be backportable use an external lock.",
  "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-2026-89940"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6865d79fca17a80fbd60c12550ca9a5e0e20e0eb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/510497e31be4f241103507315a859e2085ccb081"
    },
    {
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      "url": "https://git.kernel.org/stable/c/8b3e221590181a8beb3735bbabf166df02c839b5"
    },
    {
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      "url": "https://git.kernel.org/stable/c/f25ec4627d935dedfb5fe83bd2c2678cdcc19611"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-16T14:40:32Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The use-after-free is reached through local IIO_BUFFER_DMABUF_ATTACH/ENQUEUE/DETACH ioctls on an anonymous iio:buffer fd from IIO_BUFFER_GET_FD_IOCTL on /dev/iio:deviceN; it is not reachable from network packet processing or adjacent-link protocols.\nAC:L - The attacker fully controls the lifetime mismatch: they attach and enqueue a DMA-BUF so the dma_fence lock lives in iio_dmabuf_priv, then detach so priv is freed while the fence remains in the DMA-BUF reservation, and later DMA_BUF_IOCTL_SYNC/wait takes that freed lock.\nPR:L - The IIO open and ioctl path has no capability check, only filesystem access to the device node. On Android phones, industrial converters, and embedded systems exposing this DMA-BUF buffer API, /dev/iio:device* is commonly group-accessible without init-namespace root.\nUI:N - The attacker opens the IIO device, issues the DMA-BUF attach/enqueue/detach ioctls, and waits on their own DMA-BUF file descriptor; no separate victim action is required.\nS:U - This is a standard in-kernel heap use-after-free of iio_dmabuf_priv within the host kernel's security authority, not a VM escape, IOMMU boundary bypass, or sandbox escape.\nC:H - The dma_fence retains a pointer to a spinlock embedded in freed iio_dmabuf_priv; later fence wait/sync operations use that lock, a slab use-after-free that can be turned into an arbitrary kernel memory read via heap spraying.\nI:H - The same use-after-free of iio_dmabuf_priv lets an attacker reclaim the object and corrupt dma_fence lock and callback state during later wait or signaling paths, enabling heap corruption, arbitrary write, and control-flow hijacking.\nA:H - Taking a spinlock in already-freed iio_dmabuf_priv memory causes a kernel oops, BUG, or panic; any use-after-free is high availability impact even when not fully exploited."
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  }
}