{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64134",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64134"
  ],
  "published": "2026-07-19T15:41:06Z",
  "summary": "ALSA: pcm: Don't setup bogus iov_iter for silencing",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: pcm: Don't setup bogus iov_iter for silencing\n\nAt transition to the iov_iter for PCM data transfer, we blindly\napplied the iov_iter setup also for silencing (i.e. data = NULL), and\nit leads to a calculation of bogus iov_iter.  Fortunately this didn't\ncause troubles on most of architectures but it goes wrong on RISC-V\nnow, causing a NULL dereference.\n\nHandle the NULL data case to treat the silencing in interleaved_copy()\nfor addressing the bug above.  noninterleaved_copy() has already the\nNULL data handling, so it doesn't need changes.",
  "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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      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64134"
    },
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      "url": "https://git.kernel.org/stable/c/41a766c647294842c9b17672449f8e011048cba9"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
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      "scenario": "AV:L - The vulnerable code is reached only via local ALSA PCM interfaces\u2014opening `/dev/snd/pcmC*D*p`, `write()`/`ioctl()` on that device, or OSS PCM emulation\u2014not via any network-facing kernel protocol.\nAC:L - An attacker with PCM device access can reliably trigger silencing by setting `silence_size > 0` via `SNDRV_PCM_IOCTL_SW_PARAMS`, using OSS playback (which auto-enables silence), calling `snd_pcm_lib_write()` with a NULL buffer, or starting playback so `snd_pcm_playback_silence()` runs on interleaved streams.\nPR:L - Exploitation requires a local process able to open and configure a PCM playback stream (typically any logged-in desktop/mobile user with audio device access via the `audio` group, seat ACL, or equivalent permissions), not root or special capabilities.\nUI:N - Triggering the bug requires only programmatic PCM playback/silencing operations; no victim interaction such as mounting a filesystem or opening a malicious file is needed.\nS:U - Impact is confined to kernel memory safety within the ALSA PCM subsystem on the local host; it does not cross a security boundary such as VM escape, sandbox escape, or IOMMU bypass.\nC:H - Passing `data=NULL` through `do_transfer()` constructs a bogus `iov_iter` with a NULL base pointer; this is a kernel memory-safety defect in the iterator layer that can cause out-of-bounds or NULL-based reads when iterator helpers dereference the malformed state, not merely a benign error return.\nI:H - The same bogus `iov_iter` setup supplies invalid source/destination metadata to the kernel copy path; if iterator operations proceed on the malformed structure, uncontrolled kernel writes are possible, and the identical NULL-handling gap in `noninterleaved_copy()` confirms this silencing path was always meant to bypass `do_transfer()`.\nA:H - On RISC-V the defect manifests as a kernel NULL pointer dereference during silencing, causing an oops/panic and denial of service; the bug is also reachable on every architecture where interleaved PCM silencing is used."
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}