What’s Vulnerable › Vulnerabilities

CVE-2026-90358: bpf, x86: Fix trampoline stack size for 128-bit arguments

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-30

Description

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.

Affected products

• Linux: 6.1 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2189232984b45ac8281c80484ab9f67b380a2ca1
• https://git.kernel.org/stable/c/40f3bfbbb222b92278f3797614b70f68d46824ac
• https://git.kernel.org/stable/c/4aed2346fa9b88d458eeb8c01123f3c07585a675
• https://git.kernel.org/stable/c/7f96bf0d24b2acc0732906b60a10f06783f2470d
• https://git.kernel.org/stable/c/814cba835ef648e0c5eb79505c96c0493b29eea6
• https://git.kernel.org/stable/c/a6d7d7a253c550e74b0651897fe313c2f9b2301f

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