bpf, x86: Fix trampoline stack size for 128-bit arguments
CVE-2026-90358 · published 17 Sept 2026
How serious is it
- Severity: high, CVSS score 7.8 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-90358?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 to < 7f96bf0d24b2acc0732906b60a10f06783f2470d, a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 to < 4aed2346fa9b88d458eeb8c01123f3c07585a675, a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 to < 40f3bfbbb222b92278f3797614b70f68d46824ac, a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 to < a6d7d7a253c550e74b0651897fe313c2f9b2301f
- Linux Linux: 6.1
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/7f96bf0d24b2acc0732906b60a10f06783f2470d
- git.kernel.org/stable/c/4aed2346fa9b88d458eeb8c01123f3c07585a675
- git.kernel.org/stable/c/40f3bfbbb222b92278f3797614b70f68d46824ac
- git.kernel.org/stable/c/a6d7d7a253c550e74b0651897fe313c2f9b2301f
- git.kernel.org/stable/c/814cba835ef648e0c5eb79505c96c0493b29eea6
Merged from CVE List. Last updated 26 Oct 2026. All vulnerabilities · RSS · JSON