{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "8c57b687e8331eb80e302a2c528b18b966a9ac7a"
            },
            {
              "fixed": "06c76d3c389ff504052f64b1acee44651bd847fa"
            },
            {
              "fixed": "68a069b407303e71db371df85036101e8ff59280"
            },
            {
              "fixed": "3105ae628fb785d48b49256468be4f21a7b3cfc0"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.15.0"
            },
            {
              "fixed": "6.18.51"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90046.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/page_alloc: don't spin_trylock() in NMI on UP\n\nPatch series \"mm/page_alloc: fixes for free_pages_nolock() on RT/UP\".\n\nPre-existing bugs found by Sashiko during review of this other series:\nhttps://lore.kernel.org/all/20260703-alloc-trylock-v5-0-c87b714e19d3@google.com/\n\nI have not reproduced these bugs, and I suspect there is no real-world\nuser that is affected by them.\n\n\nThis patch (of 2):\n\nAs noted in can_spin_trylock(), using this is unsafe in this context. \ncommit 620b46ed6ae17 (\"mm/page_alloc: return NULL early from\nalloc_frozen_pages_nolock() in NMI on UP\") fixed this on the alloc side\nbut missed the free side.\n\nImpact: If BPF programs using these features in NMI (probably tracing) are\npresent on non-SMP builds this might crash the kernel and is probably\nexploitable by local attackers for privilege escalation.",
  "id": "CVE-2026-90046",
  "modified": "2026-09-18T03:30:37.130905370Z",
  "published": "2026-09-16T10:33:43.156Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/06c76d3c389ff504052f64b1acee44651bd847fa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3105ae628fb785d48b49256468be4f21a7b3cfc0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/68a069b407303e71db371df85036101e8ff59280"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90046.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90046"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "mm/page_alloc: don't spin_trylock() in NMI on UP"
}