Skip to main content
cve.nowby Sazabi
← All vulnerabilities
CVE-2026-93138

bpf: Fix vmlinux BTF prep race in bpf_get_btf_vmlinux

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix vmlinux BTF prep race in bpf_get_btf_vmlinux bpf_get_btf_vmlinux() lazily parses the vmlinux BTF under the bpf_verifier_lock, but publishes the result through a plain store and re-checks it through a plain lockless load. Nothing orders the stores initializing the struct btf inside btf_parse_vmlinux() against the store publishing the pointer: On a weakly ordered arch, a concurrent first-time caller taking the lockless fast path could in principle observe the pointer before the parsed contents are visible. The mutex_unlock() does not help such a reader given it only synchronizes with a later acquisition of the same lock. Thus, publish the pointer with smp_store_release() and read it on the fast path with smp_load_acquire(). Acquire semantics are needed rather than a dependency-ordered READ_ONCE(): btf_parse_vmlinux() also populates globals outside the returned object (e.g. bpf_ctx_convert.t). An address dependency would only order accesses performed through the pointer and not cover other globals.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 8580ac9404f6240668a026785d7d8856f0530409 · fixed in f32a4a40bc635be25d6816da4bd91e9e58c31bf3; From 8580ac9404f6240668a026785d7d8856f0530409 · fixed in a7fe72d780122eb934536f1719abad445f6afdf7; From 8580ac9404f6240668a026785d7d8856f0530409 · fixed in e18a10b39c994f04e1ebd7f8fc042bb1ca8ad053; From 8580ac9404f6240668a026785d7d8856f0530409 · fixed in 978524ecfc1c539282df5858de1eec20748c6f74; From 8580ac9404f6240668a026785d7d8856f0530409 · fixed in eaf302628a78806f66d8224d6ba03fb4d5025de4; From 8580ac9404f6240668a026785d7d8856f0530409 · fixed in 2892f3f44bf865c8fb6b6c0960edec4cc91806ee; From 8580ac9404f6240668a026785d7d8856f0530409 · fixed in 86d11c594d60b255b526fa5260f669463fb1a063; From 8580ac9404f6240668a026785d7d8856f0530409 · fixed in 92863e678070f57c17c868e4bfa2441a5c61ad2b

  • Linux Linux

    5.5

  • KernelLinux

    From 5.5.0 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6

References 8

git.kernel.org