GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-89604 (GCVE-0-2026-89604)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:45 – Updated: 2026-09-14 12:01
VLAI
Title
efivarfs: Rate limit statfs() handler
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 115409cbb6a296d73702a62c54c5b1b11cb88b3d , < 97d71ebee48cd1b29091762b3e5cca4f815dd84c (git)
Affected: d86ff3333cb1d5f42d8898fb5fdb304e143c0237 , < 3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae (git)
Affected: d86ff3333cb1d5f42d8898fb5fdb304e143c0237 , < 8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41 (git)
Affected: d86ff3333cb1d5f42d8898fb5fdb304e143c0237 , < 92895a14329cc9533e2a74a265214f690ba3851a (git)
Affected: d86ff3333cb1d5f42d8898fb5fdb304e143c0237 , < 0dbc2e94b81df5a1264068b6ed3605c654b8afcb (git)
Affected: d86ff3333cb1d5f42d8898fb5fdb304e143c0237 , < b2326338dc683e8c1067c0cbf7a47986c4190902 (git)
Affected: 6.1.178 , < 6.1.188 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "6.1.178",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.109",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T12:01:24.587Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/97d71ebee48cd1b29091762b3e5cca4f815dd84c"
        },
        {
          "url": "https://git.kernel.org/stable/c/3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae"
        },
        {
          "url": "https://git.kernel.org/stable/c/8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41"
        },
        {
          "url": "https://git.kernel.org/stable/c/92895a14329cc9533e2a74a265214f690ba3851a"
        },
        {
          "url": "https://git.kernel.org/stable/c/0dbc2e94b81df5a1264068b6ed3605c654b8afcb"
        },
        {
          "url": "https://git.kernel.org/stable/c/b2326338dc683e8c1067c0cbf7a47986c4190902"
        }
      ],
      "title": "efivarfs: Rate limit statfs() handler",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89604",
    "datePublished": "2026-09-11T19:45:07.365Z",
    "dateReserved": "2026-09-11T19:38:34.733Z",
    "dateUpdated": "2026-09-14T12:01:24.587Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89604",
      "date": "2026-09-15",
      "epss": "0.00205",
      "percentile": "0.10766"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-14T14:56:50.000Z",
      "cve": "CVE-2026-89604",
      "id": "msrc_CVE-2026-89604",
      "initial_release_date": "2026-09-13T01:09:56.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "efivarfs: Rate limit statfs() handler",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89604.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89604\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-11T20:19:45.370\",\"lastModified\":\"2026-09-14T13:19:14.470\",\"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-rc1\",\"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\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-15T05:13:04+00:00",
      "cve": "CVE-2026-89604",
      "id": "CVE-2026-89604",
      "initial_release_date": "2026-09-11T19:45:07.365000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel efivarfs: Denial of Service via statfs() handler",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89604.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-12T23:48:52Z",
      "cve": "CVE-2026-89604",
      "id": "CVE-2026-89604",
      "initial_release_date": "2026-09-12T16:25:18Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89604",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89604.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.