GHSA-RW3P-G3WM-QV8P

Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-23 15:33
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

KVM: s390: pci: Fix memory accounting for pinned/unpinned pages

The account_mem() and unaccount_mem() functions call get_uid() which increments the reference count of struct user_struct on every invocation. But we don't decrement the count by calling free_uid(). It also accounted/unaccounted the pages against the current->mm. But its possible the unaccount_mem() can be called from a different process context than the one that originally pinned the pages.

Let's fix this by storing the pinning process user_struct and mm_struct when accounting for pinned pages, and subsequently free these resources when the pages are unpinned.

[borntraeger@linux.ibm.com: Fixed whitespace]

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74514"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T13:17:56Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: pci: Fix memory accounting for pinned/unpinned pages\n\nThe account_mem() and unaccount_mem() functions call get_uid() which\nincrements the reference count of struct user_struct on every invocation.\nBut we don\u0027t decrement the count by calling free_uid(). It also\naccounted/unaccounted the pages against the current-\u003emm. But its possible\nthe unaccount_mem() can be called from a different process context than the\none that originally pinned the pages.\n\nLet\u0027s fix this by storing the pinning process user_struct and mm_struct\nwhen accounting for pinned pages, and subsequently free these resources\nwhen the pages are unpinned.\n\n[borntraeger@linux.ibm.com: Fixed whitespace]",
  "id": "GHSA-rw3p-g3wm-qv8p",
  "modified": "2026-08-23T15:33:02Z",
  "published": "2026-08-15T15:30:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74514"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/36f6999ecde3976731a8bfc0b8e667da6f593069"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/47cfd75d9df7c8f425b0d769328fe43a8a8e606e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/70871b121f81d08879363cb1238a4c85c5c2800c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad1c2ac7f15b224cf9ab26b593caa9bd1a4be72e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dc7465a364104526c56b922c9de9dfcc08a7d5f7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e3f732e086e438c52c7400bd2734bb166aa4752c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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