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.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
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.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-98024 being exploited?
There is no known exploitation of CVE-2026-98024 in the wild and no public exploit code.
Sources
Also known as AZL-104307, BELL-CVE-2026-98024, DEBIAN-CVE-2026-98024, GHSA-8x93-8jfm-fwvw, UBUNTU-CVE-2026-98024.