FKIE_CVE-2026-74514

Vulnerability from fkie_nvd - Published: 2026-08-15 13:17 - Updated: 2026-08-23 13:16
Severity
Summary
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]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/36f6999ecde3976731a8bfc0b8e667da6f593069
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/47cfd75d9df7c8f425b0d769328fe43a8a8e606e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/70871b121f81d08879363cb1238a4c85c5c2800c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ad1c2ac7f15b224cf9ab26b593caa9bd1a4be72e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc7465a364104526c56b922c9de9dfcc08a7d5f7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e3f732e086e438c52c7400bd2734bb166aa4752c
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/kvm/pci.c",
            "arch/s390/kvm/pci.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ad1c2ac7f15b224cf9ab26b593caa9bd1a4be72e",
              "status": "affected",
              "version": "3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc",
              "versionType": "git"
            },
            {
              "lessThan": "dc7465a364104526c56b922c9de9dfcc08a7d5f7",
              "status": "affected",
              "version": "3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc",
              "versionType": "git"
            },
            {
              "lessThan": "47cfd75d9df7c8f425b0d769328fe43a8a8e606e",
              "status": "affected",
              "version": "3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc",
              "versionType": "git"
            },
            {
              "lessThan": "70871b121f81d08879363cb1238a4c85c5c2800c",
              "status": "affected",
              "version": "3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc",
              "versionType": "git"
            },
            {
              "lessThan": "e3f732e086e438c52c7400bd2734bb166aa4752c",
              "status": "affected",
              "version": "3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc",
              "versionType": "git"
            },
            {
              "lessThan": "36f6999ecde3976731a8bfc0b8e667da6f593069",
              "status": "affected",
              "version": "3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/kvm/pci.c",
            "arch/s390/kvm/pci.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
            },
            {
              "lessThan": "6.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.184",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-74514",
  "lastModified": "2026-08-23T13:16:45.457",
  "metrics": {},
  "published": "2026-08-15T13:17:56.530",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/36f6999ecde3976731a8bfc0b8e667da6f593069"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/47cfd75d9df7c8f425b0d769328fe43a8a8e606e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/70871b121f81d08879363cb1238a4c85c5c2800c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ad1c2ac7f15b224cf9ab26b593caa9bd1a4be72e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dc7465a364104526c56b922c9de9dfcc08a7d5f7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e3f732e086e438c52c7400bd2734bb166aa4752c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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