{
  "cveId": "CVE-2026-53161",
  "url": "https://patchblox.com/security/cve/CVE-2026-53161",
  "summary": "CVE-2026-53161 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-53161, released June 25, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "misc: fastrpc: fix use-after-free of fastrpc_user in workqueue context",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  misc: fastrpc: fix use-after-free of fastrpc_user in workqueue context  There is a race between fastrpc_device_release() and the workqueue that processes DSP responses. When the user closes the file descriptor, fastrpc_device_release() frees the fastrpc_user structure. Concurrently, an in-flight DSP invocation can complete and fastrpc_rpmsg_callback() schedules context cleanup via schedule_work(\u0026ctx-\u003Eput_work). If the workqueue runs fastrpc_context_free() in parallel with or after fastrpc_device_release() has freed the user structure, it dereferences the freed fastrpc_user. Depending on the state of the context at the time of the race, any one of the following accesses can be hit:   1. fastrpc_buf_free() calls fastrpc_ipa_to_dma_addr(buf-\u003Efl-\u003Ecctx, ...)     to strip the SID bits from the stored IOVA before passing the     physical address to dma_free_coherent().   2. fastrpc_free_map() reads map-\u003Efl-\u003Ecctx-\u003Evmperms[0].vmid to     reconstruct the source permission bitmask needed for the     qcom_scm_assign_mem() call that returns memory from the DSP VM     back to HLOS.   3. fastrpc_free_map() acquires map-\u003Efl-\u003Elock to safely remove the     map node from the fl-\u003Emaps list.  The resulting use-after-free manifests as:    pc : fastrpc_buf_free\u002B0x38/0x80 [fastrpc]   lr : fastrpc_context_free\u002B0xa8/0x1b0 [fastrpc]   fastrpc_context_free\u002B0xa8/0x1b0 [fastrpc]   fastrpc_context_put_wq\u002B0x78/0xa0 [fastrpc]   process_one_work\u002B0x180/0x450   worker_thread\u002B0x26c/0x388  Add kref-based reference counting to fastrpc_user. Have each invoke context take a reference on the user at allocation time and release it when the context is freed. Release the initial reference in fastrpc_device_release() at file close. Move the teardown of the user structure \u2014 freeing pending contexts, maps, mmaps, and the channel context reference \u2014 into the kref release callback fastrpc_user_free(), so that it runs only when the last reference is dropped, regardless of whether that happens at device close or after the final in-flight context completes.",
  "published": "2026-06-25T09:16:33Z",
  "severity": "Moderate",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00126,
  "epssPercentile": 0.02276,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53161",
  "fixes": [
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      "platform": "linux",
      "product": "dtb-aarch64",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.37.1",
      "fix": "OPENSUSE-SU-2026:21555-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1",
      "released": "2026-08-12T01:09:28Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.37.1",
      "fix": "OPENSUSE-SU-2026:21555-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1",
      "released": "2026-08-12T01:09:28Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.73.2",
      "fix": "SUSE-SU-2026:3166-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3166-1",
      "released": "2026-07-21T17:09:27Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "sles 16.0",
      "fixedVersion": "6.12.0-160000.37.1",
      "fix": "SUSE-SU-2026:23231-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23231-1",
      "released": "2026-08-11T21:26:34Z"
    },
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      "product": "kernel-azure",
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  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}