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FKIE_CVE-2026-89604

Vulnerability from fkie_nvd - Published: 2026-09-11 20:19 - Updated: 2026-09-14 13:19
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: efivarfs: Rate limit statfs() handler Ravi reports that statfs() may be called by unprivileged users on the efivarfs mount point, which may result in a flood of calls to the QueryVariableInfo() runtime service. These calls are disproportionately costly on x86 systems where the variable store is backed by SMM, as each SMM entry requires a rendez-vous of all the CPUs. So rate limit the calls to QueryVariableInfo() at twice per second, and return the most recently obtained value for calls that are elided.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0dbc2e94b81df5a1264068b6ed3605c654b8afcb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/92895a14329cc9533e2a74a265214f690ba3851a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/97d71ebee48cd1b29091762b3e5cca4f815dd84c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b2326338dc683e8c1067c0cbf7a47986c4190902
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/efivarfs/super.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "97d71ebee48cd1b29091762b3e5cca4f815dd84c",
              "status": "affected",
              "version": "115409cbb6a296d73702a62c54c5b1b11cb88b3d",
              "versionType": "git"
            },
            {
              "lessThan": "3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae",
              "status": "affected",
              "version": "d86ff3333cb1d5f42d8898fb5fdb304e143c0237",
              "versionType": "git"
            },
            {
              "lessThan": "8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41",
              "status": "affected",
              "version": "d86ff3333cb1d5f42d8898fb5fdb304e143c0237",
              "versionType": "git"
            },
            {
              "lessThan": "92895a14329cc9533e2a74a265214f690ba3851a",
              "status": "affected",
              "version": "d86ff3333cb1d5f42d8898fb5fdb304e143c0237",
              "versionType": "git"
            },
            {
              "lessThan": "0dbc2e94b81df5a1264068b6ed3605c654b8afcb",
              "status": "affected",
              "version": "d86ff3333cb1d5f42d8898fb5fdb304e143c0237",
              "versionType": "git"
            },
            {
              "lessThan": "b2326338dc683e8c1067c0cbf7a47986c4190902",
              "status": "affected",
              "version": "d86ff3333cb1d5f42d8898fb5fdb304e143c0237",
              "versionType": "git"
            },
            {
              "lessThan": "6.1.188",
              "status": "affected",
              "version": "6.1.178",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/efivarfs/super.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.5"
            },
            {
              "lessThan": "6.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "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\nefivarfs: Rate limit statfs() handler\n\nRavi reports that statfs() may be called by unprivileged users on the\nefivarfs mount point, which may result in a flood of calls to the\nQueryVariableInfo() runtime service. These calls are disproportionately\ncostly on x86 systems where the variable store is backed by SMM, as each\nSMM entry requires a rendez-vous of all the CPUs.\n\nSo rate limit the calls to QueryVariableInfo() at twice per second, and\nreturn the most recently obtained value for calls that are elided."
    }
  ],
  "id": "CVE-2026-89604",
  "lastModified": "2026-09-14T13:19:14.470",
  "metrics": {},
  "published": "2026-09-11T20:19:45.370",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0dbc2e94b81df5a1264068b6ed3605c654b8afcb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/92895a14329cc9533e2a74a265214f690ba3851a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/97d71ebee48cd1b29091762b3e5cca4f815dd84c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b2326338dc683e8c1067c0cbf7a47986c4190902"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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