{"schema":"threatline.record/2","record":{"id":"CVE-2026-93229","aliases":[],"summary":"nfsd: add missing read barrier to rpc_status_get dumpit seqcount retry","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: add missing read barrier to rpc_status_get dumpit seqcount retry\n\nThe hand-rolled seqcount-like protocol in nfsd_nl_rpc_status_get_dumpit()\nis missing a read memory barrier (smp_rmb) before its second counter\ncheck.  The standard kernel read_seqcount_retry() includes smp_rmb()\nto ensure that all data reads complete before the counter is re-checked.\n\nWithout this barrier, on weakly-ordered architectures (ARM, POWER),\nthe CPU may reorder field reads past the second counter check, making\nthe retry logic ineffective: it could observe a consistent counter pair\nwhile reading fields that have been concurrently modified by the writer.\n\nAdd smp_rmb() before the second counter check to order the field reads\nahead of it, matching the barrier semantics of the standard seqcount\nread-side.  The begin-side smp_load_acquire() already pairs with the\nsmp_store_release() in nfsd_dispatch(); with the smp_rmb() now ordering\nthe field reads, the retry check no longer needs acquire semantics and\nreads the counter with a plain READ_ONCE(), as read_seqcount_retry()\ndoes.\n\n[ cel: Use READ_ONCE instead of smp_load_acquire() ]","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93229","source_modified_at":"2026-10-19T09:07:41.099Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"bd9d6a3efa9709e653aafbeb859289feccb8e70c","lessThan":"f501f2f4ec1d2dfe39e21c98630314074a9b30b0","status":"affected","versionType":"git"},{"version":"bd9d6a3efa9709e653aafbeb859289feccb8e70c","lessThan":"1aea0482b98ecd7d0249204665f2ad4ad517f66b","status":"affected","versionType":"git"},{"version":"bd9d6a3efa9709e653aafbeb859289feccb8e70c","lessThan":"9b5f6475006cd8e3b5b99b8eb3cd74dbb1ce9df8","status":"affected","versionType":"git"},{"version":"bd9d6a3efa9709e653aafbeb859289feccb8e70c","lessThan":"a71f161a857117e8e0264deb7d14fff5c98adcf5","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93229","source_modified_at":"2026-10-19T09:07:41.099Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.7","status":"affected"},{"version":"0","lessThan":"6.7","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","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93229","source_modified_at":"2026-10-19T09:07:41.099Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"1aea0482b98ecd7d0249204665f2ad4ad517f66b","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93229","source_modified_at":"2026-10-19T09:07:41.099Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"9b5f6475006cd8e3b5b99b8eb3cd74dbb1ce9df8","basis":"first unaffected version stated in the CVE record"}],"cvss":7.1,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00125,"percentile":0.0202,"score_date":"2026-10-23"},"published_at":"2026-09-24T15:29:14.322Z","modified_at":"2026-10-19T09:07:41.099Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-93229","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:07:41.099Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-93229","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/f501f2f4ec1d2dfe39e21c98630314074a9b30b0"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/1aea0482b98ecd7d0249204665f2ad4ad517f66b"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/9b5f6475006cd8e3b5b99b8eb3cd74dbb1ce9df8"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/a71f161a857117e8e0264deb7d14fff5c98adcf5"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:07:41.099Z","content_hash":"e960788774072c670f4d7537e9b27eed69ac8287bdfdadbd424d887b59f8776c"}}