{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72476",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72476"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "dmaengine: Fix possible use after free",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: Fix possible use after free\n\nIn dma_release_channel(), check chan->device->privatecnt after call\ndma_chan_put(). However, dma_chan_put() call dma_device_put() which could\nrelease the last reference of the device if the DMA provider is already\ngone and hence free it.\n\nFixes it by moving dma_chan_put() after the check.",
  "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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            "upstream_fixed": "6.18.40"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72476"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/444f96066937f3fdf0e79b53289cff223c7d638b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ab438a9efb9042c79d2f8db28a326d55feb8591f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9bdc8dce4068dadbdf7cf5ad6d4983e2afffedce"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5876f38b67a309c00628942cb25679749b53b397"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3b0240483dc977dbec4f3bc7a5383d4691ecb625"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/329ec20a86091d2a6e5b4fe507545e7d678a22a2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0bc191050c3253da8ef4bfaf157c44efed6e22cd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/92f853f0645aebf1d05d333e97ab7c342ace1892"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The flaw is in dma_release_channel() in drivers/dma/dmaengine.c, reached only when kernel client drivers release a privately requested DMA channel during probe/remove/error teardown triggered by local device access (e.g., /dev/iio:device*, /dev/snd/*, /dev/tty*, spidev), not from any network packet or remote protocol handler.\nAC:L - An attacker can hold a DMA slave channel open via a client device, then close it to call dma_release_channel(); when the DMA provider has already unregistered via unbind, hot-unplug, or module teardown, dma_chan_put() frees dma_device and the subsequent privatecnt access is a reliably triggerable UAF with attacker-controlled release timing.\nPR:L - Exploitation requires only a local unprivileged process able to open a device whose driver uses dma_request_chan() or dma_request_channel(); on embedded ADI FPGA, Android, and industrial platforms, non-root application users commonly have such device-node access without init-namespace root or CAP_SYS_ADMIN.\nUI:N - No victim interaction is required beyond the attacker opening, holding, and closing their own device handle or racing driver teardown; no other user must mount filesystems, approve prompts, or perform separate actions for exploitation to succeed.\nS:U - This is a kernel slab use-after-free in the dmaengine channel-release path affecting the same kernel security authority; it does not cross VM, IOMMU, container, or other sandbox boundaries and is standard in-kernel memory corruption rather than a scope change.\nC:H - After dma_chan_put() frees the last dma_device kref, the code reads and decrements privatecnt and may clear cap_mask on freed kmalloc memory; UAF on dma_device objects enables disclosure of attacker-influenced freed-heap contents per kernel UAF scoring guidance.\nI:H - Post-free modification of privatecnt and cap_mask corrupts reused slab objects under attacker influence, providing a plausible kernel heap corruption path toward arbitrary write primitives, control-flow hijacking, or local privilege escalation.\nA:H - Dereferencing freed dma_device memory during dma_release_channel() can cause KASAN slab-use-after-free reports, kernel oops, BUG, or panic; kernel guidance treats any use-after-free as high availability impact even when full exploitation is not demonstrated."
    }
  }
}