CVE-2026-90434 isofs: release zisofs block pointer buffer head
A memory leak in the Linux kernel's isofs filesystem allows local attackers to cause a denial of service by exhausting memory resources.
- 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-2026-90434?
CVE-2026-90434 is a memory corruption 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:
isofs: release zisofs block pointer buffer head
zisofs_fill_pages() reads the compressed block pointer table. The error paths release the current buffer_head, the loop also releases the old buffer_head when it advances. However, the success path leaves the last buffer_head referenced. Release it before returning success.
Which versions are affected by CVE-2026-90434?
How do I fix CVE-2026-90434?
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-2026-90434 being exploited?
There is no known exploitation of CVE-2026-90434 in the wild and no public exploit code.
Sources
Also known as AZL-102995, BELL-CVE-2026-90434, DEBIAN-CVE-2026-90434, GHSA-xwjp-h426-22vm, UBUNTU-CVE-2026-90434.