{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89604", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.733Z", "datePublished": "2026-09-11T19:45:07.365Z", "dateUpdated": "2026-09-11T19:45:07.365Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:45:07.365Z"}, "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": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/efivarfs/super.c"], "versions": [{"version": "d86ff3333cb1d5f42d8898fb5fdb304e143c0237", "lessThan": "8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41", "status": "affected", "versionType": "git"}, {"version": "d86ff3333cb1d5f42d8898fb5fdb304e143c0237", "lessThan": "92895a14329cc9533e2a74a265214f690ba3851a", "status": "affected", "versionType": "git"}, {"version": "d86ff3333cb1d5f42d8898fb5fdb304e143c0237", "lessThan": "0dbc2e94b81df5a1264068b6ed3605c654b8afcb", "status": "affected", "versionType": "git"}, {"version": "d86ff3333cb1d5f42d8898fb5fdb304e143c0237", "lessThan": "b2326338dc683e8c1067c0cbf7a47986c4190902", "status": "affected", "versionType": "git"}, {"version": "115409cbb6a296d73702a62c54c5b1b11cb88b3d", "status": "affected", "versionType": "git"}, {"version": "6.1.178", "lessThan": "6.2", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/efivarfs/super.c"], "versions": [{"version": "6.5", "status": "affected"}, {"version": "0", "lessThan": "6.5", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "7.3-rc1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.178"}]}]}], "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"}}}}

{}

{"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": "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"}]}], "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": "2026-09-11T20:19:45.370", "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/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/b2326338dc683e8c1067c0cbf7a47986c4190902"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel efivarfs: Denial of Service via statfs() handler", "id": "2532362", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532362"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["A flaw was found in the Linux kernel's efivarfs component. An unprivileged local user can exploit this by repeatedly calling the `statfs()` handler on the `efivarfs` mount point. This action triggers a flood of calls to the `QueryVariableInfo()` runtime service, which is particularly costly on x86 systems. The excessive calls can lead to significant performance degradation, potentially resulting in a Denial of Service (DoS)."], "name": "CVE-2026-89604", "public_date": "2026-09-11T19:45:07Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89604\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89604\nhttps://git.kernel.org/stable/c/0dbc2e94b81df5a1264068b6ed3605c654b8afcb\nhttps://git.kernel.org/stable/c/8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41\nhttps://git.kernel.org/stable/c/92895a14329cc9533e2a74a265214f690ba3851a\nhttps://git.kernel.org/stable/c/b2326338dc683e8c1067c0cbf7a47986c4190902"], "threat_severity": "Moderate"}

{"created": "2026-09-12T04:00:07.951030+00:00", "updated": "2026-09-12T11:15:13.368621+00:00", "vendors": []}