# CVE-2026-98024: s390/ism: folio_put() after error

> A memory corruption vulnerability in the s390 ISM driver allows local attackers to cause slab allocator corruption or potential code execution via improper memory freeing.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 25 Sep 2026
- **Updated:** 19 Oct 2026
- **Also known as:** AZL-104307, BELL-CVE-2026-98024, DEBIAN-CVE-2026-98024, GHSA-8x93-8jfm-fwvw, UBUNTU-CVE-2026-98024

## What is CVE-2026-98024?

CVE-2026-98024 is a memory corruption vulnerability in Linux, published on 25 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/ism: folio_put() after error

dmb->cpu_addr was allocated via folio_alloc(). Use folio_put() instead of
kfree() in the error exit of ism_alloc_dmb() to avoid slab allocator
corruption.

While at it, reset dmb->cpu_addr after folio_put to avoid unintentional UAF
by future callers.

## Which versions are affected by CVE-2026-98024?


## How do I fix CVE-2026-98024?

Apply the vendor's patch.

## Is CVE-2026-98024 being exploited?

There is no known exploitation of CVE-2026-98024 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-98024 and fix it if it is affected.

What it is: CVE-2026-98024 is a memory corruption vulnerability in Linux, published on 25 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-2026-98024 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-2026-98024/ (Markdown: https://insights.sbomify.com/CVE-2026-98024/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-98024
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-98024
- OSV: https://osv.dev/vulnerability/CVE-2026-98024

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-98024/
Summaries are generated and may contain mistakes; the official description above is the record.