{"api_version":"1","generated_at":"2026-09-11T22:05:28+00:00","cve":"CVE-2026-89604","urls":{"html":"https://cve.report/CVE-2026-89604","api":"https://cve.report/api/cve/CVE-2026-89604.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89604","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89604"},"summary":{"title":"efivarfs: Rate limit statfs() handler","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-11 20:19:45","updated_at":"2026-09-11 20:19:45"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/0dbc2e94b81df5a1264068b6ed3605c654b8afcb","name":"https://git.kernel.org/stable/c/0dbc2e94b81df5a1264068b6ed3605c654b8afcb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/92895a14329cc9533e2a74a265214f690ba3851a","name":"https://git.kernel.org/stable/c/92895a14329cc9533e2a74a265214f690ba3851a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b2326338dc683e8c1067c0cbf7a47986c4190902","name":"https://git.kernel.org/stable/c/b2326338dc683e8c1067c0cbf7a47986c4190902","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41","name":"https://git.kernel.org/stable/c/8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89604","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89604","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d86ff3333cb1d5f42d8898fb5fdb304e143c0237 8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d86ff3333cb1d5f42d8898fb5fdb304e143c0237 92895a14329cc9533e2a74a265214f690ba3851a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d86ff3333cb1d5f42d8898fb5fdb304e143c0237 0dbc2e94b81df5a1264068b6ed3605c654b8afcb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d86ff3333cb1d5f42d8898fb5fdb304e143c0237 b2326338dc683e8c1067c0cbf7a47986c4190902 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 115409cbb6a296d73702a62c54c5b1b11cb88b3d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.1.178 6.2 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.5","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.5 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.109 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.50 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.4 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"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":"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"},{"status":"affected","version":"115409cbb6a296d73702a62c54c5b1b11cb88b3d","versionType":"git"},{"lessThan":"6.2","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":"6.12.*","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":"6.12.109","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},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.178","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":"2026-09-11T19:45:07.365Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"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":"2026-09-11T19:45:07.365Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-11 20:19:45","lastModifiedDate":"2026-09-11 20:19:45","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89604","Ordinal":"1","Title":"efivarfs: Rate limit statfs() handler","CVE":"CVE-2026-89604","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89604","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"efivarfs: Rate limit statfs() handler"}]}}}