{"id":"CVE-2026-89604","state":"PUBLISHED","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.","publishedAt":"2026-09-11T19:45:07.365Z","updatedAt":"2026-10-19T08:49:35.476Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"115409cbb6a296d73702a62c54c5b1b11cb88b3d","status":"affected","lessThan":"97d71ebee48cd1b29091762b3e5cca4f815dd84c","versionType":"git"},{"version":"d86ff3333cb1d5f42d8898fb5fdb304e143c0237","status":"affected","lessThan":"3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae","versionType":"git"},{"version":"d86ff3333cb1d5f42d8898fb5fdb304e143c0237","status":"affected","lessThan":"8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41","versionType":"git"},{"version":"d86ff3333cb1d5f42d8898fb5fdb304e143c0237","status":"affected","lessThan":"92895a14329cc9533e2a74a265214f690ba3851a","versionType":"git"},{"version":"d86ff3333cb1d5f42d8898fb5fdb304e143c0237","status":"affected","lessThan":"0dbc2e94b81df5a1264068b6ed3605c654b8afcb","versionType":"git"},{"version":"d86ff3333cb1d5f42d8898fb5fdb304e143c0237","status":"affected","lessThan":"b2326338dc683e8c1067c0cbf7a47986c4190902","versionType":"git"},{"version":"6.1.178","status":"affected","lessThan":"6.1.188","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/efivarfs/super.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.5","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/efivarfs/super.c"]}],"references":["https://git.kernel.org/stable/c/97d71ebee48cd1b29091762b3e5cca4f815dd84c","https://git.kernel.org/stable/c/3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae","https://git.kernel.org/stable/c/8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41","https://git.kernel.org/stable/c/92895a14329cc9533e2a74a265214f690ba3851a","https://git.kernel.org/stable/c/0dbc2e94b81df5a1264068b6ed3605c654b8afcb","https://git.kernel.org/stable/c/b2326338dc683e8c1067c0cbf7a47986c4190902"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89604.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89604","state":"PUBLISHED","datePublished":"2026-09-11T19:45:07.365Z","dateUpdated":"2026-10-19T08:49:35.476Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.733Z"},"containers":{"cna":{"title":"efivarfs: Rate limit statfs() handler","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":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"115409cbb6a296d73702a62c54c5b1b11cb88b3d","status":"affected","lessThan":"97d71ebee48cd1b29091762b3e5cca4f815dd84c","versionType":"git"},{"version":"d86ff3333cb1d5f42d8898fb5fdb304e143c0237","status":"affected","lessThan":"3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae","versionType":"git"},{"version":"d86ff3333cb1d5f42d8898fb5fdb304e143c0237","status":"affected","lessThan":"8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41","versionType":"git"},{"version":"d86ff3333cb1d5f42d8898fb5fdb304e143c0237","status":"affected","lessThan":"92895a14329cc9533e2a74a265214f690ba3851a","versionType":"git"},{"version":"d86ff3333cb1d5f42d8898fb5fdb304e143c0237","status":"affected","lessThan":"0dbc2e94b81df5a1264068b6ed3605c654b8afcb","versionType":"git"},{"version":"d86ff3333cb1d5f42d8898fb5fdb304e143c0237","status":"affected","lessThan":"b2326338dc683e8c1067c0cbf7a47986c4190902","versionType":"git"},{"version":"6.1.178","status":"affected","lessThan":"6.1.188","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/efivarfs/super.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.5","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/efivarfs/super.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:49:35.476Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.178","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5","versionEndExcluding":"6.6.157"},{"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}