{
  "cveId": "CVE-2026-90046",
  "url": "https://patchblox.com/security/cve/CVE-2026-90046",
  "summary": "CVE-2026-90046 is fixed in linux on 1 platform by DEBIAN-CVE-2026-90046 (version 7.2.6-1), released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "mm/page_alloc: don\u0027t spin_trylock() in NMI on UP",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mm/page_alloc: don\u0027t spin_trylock() in NMI on UP  Patch series \u0022mm/page_alloc: fixes for free_pages_nolock() on RT/UP\u0022.  Pre-existing bugs found by Sashiko during review of this other series: https://lore.kernel.org/all/20260703-alloc-trylock-v5-0-c87b714e19d3@google.com/  I have not reproduced these bugs, and I suspect there is no real-world user that is affected by them.   This patch (of 2):  As noted in can_spin_trylock(), using this is unsafe in this context.  commit 620b46ed6ae17 (\u0022mm/page_alloc: return NULL early from alloc_frozen_pages_nolock() in NMI on UP\u0022) fixed this on the alloc side but missed the free side.  Impact: If BPF programs using these features in NMI (probably tracing) are present on non-SMP builds this might crash the kernel and is probably exploitable by local attackers for privilege escalation.",
  "published": "2026-09-16T11:17:17Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00165,
  "epssPercentile": 0.0571,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-90046",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-90046",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90046",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}