{
  "cveId": "CVE-2022-49889",
  "url": "https://patchblox.com/security/cve/CVE-2022-49889",
  "summary": "CVE-2022-49889 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49889, released May 1, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ring-buffer: Check for NULL cpu_buffer in ring_b...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ring-buffer: Check for NULL cpu_buffer in ring_buffer_wake_waiters()  On some machines the number of listed CPUs may be bigger than the actual CPUs that exist. The tracing subsystem allocates a per_cpu directory with access to the per CPU ring buffer via a cpuX file. But to save space, the ring buffer will only allocate buffers for online CPUs, even though the CPU array will be as big as the nr_cpu_ids.  With the addition of waking waiters on the ring buffer when closing the file, the ring_buffer_wake_waiters() now needs to make sure that the buffer is allocated (with the irq_work allocated with it) before trying to wake waiters, as it will cause a NULL pointer dereference.  While debugging this, I added a NULL check for the buffer itself (which is OK to do), and also NULL pointer checks against buffer-\u003Ebuffers (which is not fine, and will WARN) as well as making sure the CPU number passed in is within the nr_cpu_ids (which is also not fine if it isn\u0027t).   Bugzilla: https://bugzilla.opensuse.org/show_bug.cgi?id=1204705",
  "published": "2025-05-01T15:16:13Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00201,
  "epssPercentile": 0.10017,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.0.8-1",
      "fix": "DEBIAN-CVE-2022-49889",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-49889",
      "released": "2025-05-01T15:16:13Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.0.8-1",
      "fix": "DEBIAN-CVE-2022-49889",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-49889",
      "released": "2025-05-01T15:16:13Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.0.8-1",
      "fix": "DEBIAN-CVE-2022-49889",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-49889",
      "released": "2025-05-01T15:16:13Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}