CVE-2026-98649 KVM: s390: Fix race in _destroy_pages_crste()
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Published
Updated
Check this codebase for CVE-2026-98649 and fix it if it is affected.
What it is: CVE-2026-98649 is a vulnerability in Linux, published on 18 Oct 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-2026-98649 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-2026-98649/ (Markdown: https://insights.sbomify.com/CVE-2026-98649/index.md)
A race condition in the Linux kernel's KVM s390 subsystem allows local attackers to potentially escalate privileges or cause a denial of service.
- 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-2026-98649?
CVE-2026-98649 is a vulnerability in Linux, published on 18 Oct 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:
KVM: s390: Fix race in _destroy_pages_crste()
Use READ_ONCE() in _destroy_pages_crste() to read the crste, avoid dereferencing the pointer multiple times.
Which versions are affected by CVE-2026-98649?
How do I fix CVE-2026-98649?
Apply the vendor's patch.
Is CVE-2026-98649 being exploited?
There is no known exploitation of CVE-2026-98649 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-98649, GHSA-rw83-2w75-m53r, UBUNTU-CVE-2026-98649.