{
  "cveId": "CVE-2026-98655",
  "url": "https://patchblox.com/security/cve/CVE-2026-98655",
  "summary": "CVE-2026-98655 is fixed in 39 products on 1 platform, first by DEBIAN-CVE-2026-98655, released October 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "perf: Require kernel access for text poke events",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  perf: Require kernel access for text poke events  Perf events with exclude_kernel=1 can be opened without kernel perf access. However, exclude_kernel does not suppress text-poke sideband records. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL and contains a raw kernel instruction address.  An unprivileged task can therefore open and mmap a task-local software event with text_poke=1. Both opening a count-only tracepoint event and configuring UDP GRO for ESP-in-UDP cause updates to inline static calls; the observer receives the relocated addresses of the modified instructions. For a known kernel image, any such address reveals the runtime kernel text base despite KASLR.  Call perf_allow_kernel() whenever attr.text_poke is set, regardless of exclude_kernel. Events that neither monitor kernel execution nor request text-poke records retain their existing permissions.",
  "published": "2026-10-18T16:17:18Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "epss": 0.0019,
  "epssPercentile": 0.08691,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98655",
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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"
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}