CVE-2026-90358
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel, btf_distill_func_proto() accepts function arguments up to 16 bytes, so a 128-bit scalar such as __int128 reaches the x86 trampoline with arg_size == 16. The current implementation assumes an __int128 argument only needs one register, so the register save area is under-allocated and save_args() overwrites adjacent stack slots.
Risk Assessment
This flaw in BPF trampoline handling on x86 can corrupt the kernel stack, potentially leading to privilege escalation or system instability. Exploitation requires the ability to load BPF programs.
Recommendation
Update the Linux kernel to a version containing the fix that computes the register count from arg_size for all arguments. Restrict the ability to load BPF programs to trusted users.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: bpf, x86: Fix trampoline stack size for 128-bit arguments btf_distill_func_proto() accepts a function argument up to 16 bytes, so a 128-bit scalar such as __int128 reaches the x86 trampoline with arg_size == 16. But the current implementation assumes an __int128 argument only needs one register, so the register save area is under-allocated and save_args() overwrites adjacent stack slots. Compute the register count from arg_size for all arguments to fix it.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS