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.
Metrics
CVSS 3.1 7.8/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HAffected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2, < 2189232984b45ac8281c80484ab9f67b380a2ca1; >= a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2, < 7f96bf0d24b2acc0732906b60a10f06783f2470d; >= a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2, < 4aed2346fa9b88d458eeb8c01123f3c07585a675; >= a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2, < 40f3bfbbb222b92278f3797614b70f68d46824ac; >= a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2, < a6d7d7a253c550e74b0651897fe313c2f9b2301f; >= a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2, < 814cba835ef648e0c5eb79505c96c0493b29eea6 |
| Linux | Linux | 6.1 |
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
Timeline
- Published
- Sep 17, 2026
- Last modified
- Oct 30, 2026
- NVD status
- Received