{"api_version":"1","generated_at":"2026-09-18T02:28:42+00:00","cve":"CVE-2026-93138","urls":{"html":"https://cve.report/CVE-2026-93138","api":"https://cve.report/api/cve/CVE-2026-93138.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-93138","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-93138"},"summary":{"title":"bpf: Fix vmlinux BTF prep race in bpf_get_btf_vmlinux","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix vmlinux BTF prep race in bpf_get_btf_vmlinux\n\nbpf_get_btf_vmlinux() lazily parses the vmlinux BTF under the\nbpf_verifier_lock, but publishes the result through a plain store\nand re-checks it through a plain lockless load. Nothing orders\nthe stores initializing the struct btf inside btf_parse_vmlinux()\nagainst the store publishing the pointer: On a weakly ordered\narch, a concurrent first-time caller taking the lockless fast\npath could in principle observe the pointer before the parsed\ncontents are visible. The mutex_unlock() does not help such a\nreader given it only synchronizes with a later acquisition of the\nsame lock. Thus, publish the pointer with smp_store_release()\nand read it on the fast path with smp_load_acquire().\n\nAcquire semantics are needed rather than a dependency-ordered\nREAD_ONCE(): btf_parse_vmlinux() also populates globals outside\nthe returned object (e.g. bpf_ctx_convert.t). An address\ndependency would only order accesses performed through the\npointer and not cover other globals.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:18:08","updated_at":"2026-09-17 17:18:08"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/86d11c594d60b255b526fa5260f669463fb1a063","name":"https://git.kernel.org/stable/c/86d11c594d60b255b526fa5260f669463fb1a063","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a7fe72d780122eb934536f1719abad445f6afdf7","name":"https://git.kernel.org/stable/c/a7fe72d780122eb934536f1719abad445f6afdf7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/eaf302628a78806f66d8224d6ba03fb4d5025de4","name":"https://git.kernel.org/stable/c/eaf302628a78806f66d8224d6ba03fb4d5025de4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f32a4a40bc635be25d6816da4bd91e9e58c31bf3","name":"https://git.kernel.org/stable/c/f32a4a40bc635be25d6816da4bd91e9e58c31bf3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/92863e678070f57c17c868e4bfa2441a5c61ad2b","name":"https://git.kernel.org/stable/c/92863e678070f57c17c868e4bfa2441a5c61ad2b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/978524ecfc1c539282df5858de1eec20748c6f74","name":"https://git.kernel.org/stable/c/978524ecfc1c539282df5858de1eec20748c6f74","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e18a10b39c994f04e1ebd7f8fc042bb1ca8ad053","name":"https://git.kernel.org/stable/c/e18a10b39c994f04e1ebd7f8fc042bb1ca8ad053","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2892f3f44bf865c8fb6b6c0960edec4cc91806ee","name":"https://git.kernel.org/stable/c/2892f3f44bf865c8fb6b6c0960edec4cc91806ee","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93138","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93138","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8580ac9404f6240668a026785d7d8856f0530409 f32a4a40bc635be25d6816da4bd91e9e58c31bf3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8580ac9404f6240668a026785d7d8856f0530409 a7fe72d780122eb934536f1719abad445f6afdf7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8580ac9404f6240668a026785d7d8856f0530409 e18a10b39c994f04e1ebd7f8fc042bb1ca8ad053 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8580ac9404f6240668a026785d7d8856f0530409 978524ecfc1c539282df5858de1eec20748c6f74 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8580ac9404f6240668a026785d7d8856f0530409 eaf302628a78806f66d8224d6ba03fb4d5025de4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8580ac9404f6240668a026785d7d8856f0530409 2892f3f44bf865c8fb6b6c0960edec4cc91806ee git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8580ac9404f6240668a026785d7d8856f0530409 86d11c594d60b255b526fa5260f669463fb1a063 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8580ac9404f6240668a026785d7d8856f0530409 92863e678070f57c17c868e4bfa2441a5c61ad2b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.5","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.5 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.270 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.221 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.188 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.52 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.6 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":["kernel/bpf/verifier.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"f32a4a40bc635be25d6816da4bd91e9e58c31bf3","status":"affected","version":"8580ac9404f6240668a026785d7d8856f0530409","versionType":"git"},{"lessThan":"a7fe72d780122eb934536f1719abad445f6afdf7","status":"affected","version":"8580ac9404f6240668a026785d7d8856f0530409","versionType":"git"},{"lessThan":"e18a10b39c994f04e1ebd7f8fc042bb1ca8ad053","status":"affected","version":"8580ac9404f6240668a026785d7d8856f0530409","versionType":"git"},{"lessThan":"978524ecfc1c539282df5858de1eec20748c6f74","status":"affected","version":"8580ac9404f6240668a026785d7d8856f0530409","versionType":"git"},{"lessThan":"eaf302628a78806f66d8224d6ba03fb4d5025de4","status":"affected","version":"8580ac9404f6240668a026785d7d8856f0530409","versionType":"git"},{"lessThan":"2892f3f44bf865c8fb6b6c0960edec4cc91806ee","status":"affected","version":"8580ac9404f6240668a026785d7d8856f0530409","versionType":"git"},{"lessThan":"86d11c594d60b255b526fa5260f669463fb1a063","status":"affected","version":"8580ac9404f6240668a026785d7d8856f0530409","versionType":"git"},{"lessThan":"92863e678070f57c17c868e4bfa2441a5c61ad2b","status":"affected","version":"8580ac9404f6240668a026785d7d8856f0530409","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/bpf/verifier.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.5"},{"lessThan":"5.5","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.270","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.221","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":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.52","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.6","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":"5.10.270","versionStartIncluding":"5.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.221","versionStartIncluding":"5.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.188","versionStartIncluding":"5.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","versionStartIncluding":"5.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"5.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.52","versionStartIncluding":"5.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"5.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"5.5","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix vmlinux BTF prep race in bpf_get_btf_vmlinux\n\nbpf_get_btf_vmlinux() lazily parses the vmlinux BTF under the\nbpf_verifier_lock, but publishes the result through a plain store\nand re-checks it through a plain lockless load. Nothing orders\nthe stores initializing the struct btf inside btf_parse_vmlinux()\nagainst the store publishing the pointer: On a weakly ordered\narch, a concurrent first-time caller taking the lockless fast\npath could in principle observe the pointer before the parsed\ncontents are visible. The mutex_unlock() does not help such a\nreader given it only synchronizes with a later acquisition of the\nsame lock. Thus, publish the pointer with smp_store_release()\nand read it on the fast path with smp_load_acquire().\n\nAcquire semantics are needed rather than a dependency-ordered\nREAD_ONCE(): btf_parse_vmlinux() also populates globals outside\nthe returned object (e.g. bpf_ctx_convert.t). An address\ndependency would only order accesses performed through the\npointer and not cover other globals."}],"providerMetadata":{"dateUpdated":"2026-09-17T16:11:38.795Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/f32a4a40bc635be25d6816da4bd91e9e58c31bf3"},{"url":"https://git.kernel.org/stable/c/a7fe72d780122eb934536f1719abad445f6afdf7"},{"url":"https://git.kernel.org/stable/c/e18a10b39c994f04e1ebd7f8fc042bb1ca8ad053"},{"url":"https://git.kernel.org/stable/c/978524ecfc1c539282df5858de1eec20748c6f74"},{"url":"https://git.kernel.org/stable/c/eaf302628a78806f66d8224d6ba03fb4d5025de4"},{"url":"https://git.kernel.org/stable/c/2892f3f44bf865c8fb6b6c0960edec4cc91806ee"},{"url":"https://git.kernel.org/stable/c/86d11c594d60b255b526fa5260f669463fb1a063"},{"url":"https://git.kernel.org/stable/c/92863e678070f57c17c868e4bfa2441a5c61ad2b"}],"title":"bpf: Fix vmlinux BTF prep race in bpf_get_btf_vmlinux","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-93138","datePublished":"2026-09-17T16:11:38.795Z","dateReserved":"2026-09-17T16:02:15.088Z","dateUpdated":"2026-09-17T16:11:38.795Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:18:08","lastModifiedDate":"2026-09-17 17:18:08","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"93138","Ordinal":"1","Title":"bpf: Fix vmlinux BTF prep race in bpf_get_btf_vmlinux","CVE":"CVE-2026-93138","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"93138","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix vmlinux BTF prep race in bpf_get_btf_vmlinux\n\nbpf_get_btf_vmlinux() lazily parses the vmlinux BTF under the\nbpf_verifier_lock, but publishes the result through a plain store\nand re-checks it through a plain lockless load. Nothing orders\nthe stores initializing the struct btf inside btf_parse_vmlinux()\nagainst the store publishing the pointer: On a weakly ordered\narch, a concurrent first-time caller taking the lockless fast\npath could in principle observe the pointer before the parsed\ncontents are visible. The mutex_unlock() does not help such a\nreader given it only synchronizes with a later acquisition of the\nsame lock. Thus, publish the pointer with smp_store_release()\nand read it on the fast path with smp_load_acquire().\n\nAcquire semantics are needed rather than a dependency-ordered\nREAD_ONCE(): btf_parse_vmlinux() also populates globals outside\nthe returned object (e.g. bpf_ctx_convert.t). An address\ndependency would only order accesses performed through the\npointer and not cover other globals.","Type":"Description","Title":"bpf: Fix vmlinux BTF prep race in bpf_get_btf_vmlinux"}]}}}