CVE-2026-93147 s390/bpf: Replace ly instruction with llgf
High 7.8
Published
Updated
Check this codebase for CVE-2026-93147 and fix it if it is affected.
What it is: CVE-2026-93147 is a high-severity vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-93147 in the wild and no public exploit code.
Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-93147/ (Markdown: https://insights.sbomify.com/CVE-2026-93147/index.md)
Incorrect register zeroing in s390 BPF JIT compiler may lead to undefined behavior or information leakage.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93147?
CVE-2026-93147 is a high-severity vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
s390/bpf: Replace ly instruction with llgf
cpu_nr is a 32 bit value and BPF_REG_0 is a 64 bit register, when ly loads the cpu_nr into BPF_REG_0 it does not zero the upper bits, but llgf does.
Which versions are affected by CVE-2026-93147?
How do I fix CVE-2026-93147?
Apply the vendor's patch.
Is CVE-2026-93147 being exploited?
There is no known exploitation of CVE-2026-93147 in the wild and no public exploit code.
Sources
Also known as GHSA-fgfc-g2f4-qw94, UBUNTU-CVE-2026-93147.