CVE-2026-89604

Full vulnerability record from the local CVENow database.

Description

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.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-11 20:19:45.370000

Last modified

2026-10-19 09:17:56.860000

View original CVE JSON

{
  "id": "CVE-2026-89604",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-11T20:19:45.370",
  "lastModified": "2026-10-19T09:17:56.860",
  "vulnStatus": "Received",
  "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."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "fs/efivarfs/super.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "115409cbb6a296d73702a62c54c5b1b11cb88b3d",
              "lessThan": "97d71ebee48cd1b29091762b3e5cca4f815dd84c",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "d86ff3333cb1d5f42d8898fb5fdb304e143c0237",
              "lessThan": "3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "d86ff3333cb1d5f42d8898fb5fdb304e143c0237",
              "lessThan": "8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "d86ff3333cb1d5f42d8898fb5fdb304e143c0237",
              "lessThan": "92895a14329cc9533e2a74a265214f690ba3851a",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "d86ff3333cb1d5f42d8898fb5fdb304e143c0237",
              "lessThan": "0dbc2e94b81df5a1264068b6ed3605c654b8afcb",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "d86ff3333cb1d5f42d8898fb5fdb304e143c0237",
              "lessThan": "b2326338dc683e8c1067c0cbf7a47986c4190902",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "6.1.178",
              "lessThan": "6.1.188",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "fs/efivarfs/super.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.5",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.5",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.188",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.157",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.109",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.50",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.4",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "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",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}