Race condition in Linux kernel - CVE-2026-93138
Published: September 18, 2026
Vulnerability identifier: #VU150871
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-93138
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to access incompletely initialized vmlinux BTF data.
The vulnerability exists due to a race condition in bpf_get_btf_vmlinux when concurrently invoking the function during first-time vmlinux BTF parsing. A local user can invoke the affected function concurrently to access incompletely initialized vmlinux BTF data.
The race can occur on weakly ordered architectures when CONFIG_DEBUG_INFO_BTF is enabled.
Affected software
Linux kernel
How to mitigate CVE-2026-93138
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/2892f3f44bf865c8fb6b6c0960edec4cc91806ee
- https://git.kernel.org/stable/c/86d11c594d60b255b526fa5260f669463fb1a063
- https://git.kernel.org/stable/c/92863e678070f57c17c868e4bfa2441a5c61ad2b
- https://git.kernel.org/stable/c/978524ecfc1c539282df5858de1eec20748c6f74
- https://git.kernel.org/stable/c/a7fe72d780122eb934536f1719abad445f6afdf7
- https://git.kernel.org/stable/c/e18a10b39c994f04e1ebd7f8fc042bb1ca8ad053
- https://git.kernel.org/stable/c/eaf302628a78806f66d8224d6ba03fb4d5025de4
- https://git.kernel.org/stable/c/f32a4a40bc635be25d6816da4bd91e9e58c31bf3