CVE-2026-90358

Published: September 19, 2026Last modified: September 28, 2026

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.

Severity score breakdown

Status

References

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