{"id":"CVE-2026-93138","title":"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…","summary":"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…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 8580ac9404f6240668a026785d7d8856f0530409 < f32a4a40bc635be25d6816da4bd91e9e58c31bf3","Linux >= 8580ac9404f6240668a026785d7d8856f0530409 < a7fe72d780122eb934536f1719abad445f6afdf7","Linux >= 8580ac9404f6240668a026785d7d8856f0530409 < e18a10b39c994f04e1ebd7f8fc042bb1ca8ad053","Linux >= 8580ac9404f6240668a026785d7d8856f0530409 < 978524ecfc1c539282df5858de1eec20748c6f74","Linux >= 8580ac9404f6240668a026785d7d8856f0530409 < eaf302628a78806f66d8224d6ba03fb4d5025de4","Linux >= 8580ac9404f6240668a026785d7d8856f0530409 < 2892f3f44bf865c8fb6b6c0960edec4cc91806ee","Linux >= 8580ac9404f6240668a026785d7d8856f0530409 < 86d11c594d60b255b526fa5260f669463fb1a063","Linux >= 8580ac9404f6240668a026785d7d8856f0530409 < 92863e678070f57c17c868e4bfa2441a5c61ad2b","Linux 5.5"],"published":"2026-09-17","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:18:22.363","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93138","references":[{"url":"https://git.kernel.org/stable/c/2892f3f44bf865c8fb6b6c0960edec4cc91806ee","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/86d11c594d60b255b526fa5260f669463fb1a063","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/92863e678070f57c17c868e4bfa2441a5c61ad2b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/978524ecfc1c539282df5858de1eec20748c6f74","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a7fe72d780122eb934536f1719abad445f6afdf7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e18a10b39c994f04e1ebd7f8fc042bb1ca8ad053","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/eaf302628a78806f66d8224d6ba03fb4d5025de4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f32a4a40bc635be25d6816da4bd91e9e58c31bf3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00176,"epssPercentile":0.07373,"ingestedAt":"2026-09-17T16:21:47.748Z","slug":"CVE-2026-93138","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":207391,"id":"CVE-2026-93138","ts":1789757343204,"field":"cvss","old":null,"new":"7.8"},{"seq":207390,"id":"CVE-2026-93138","ts":1789757343204,"field":"severity","old":"none","new":"high"}]}