CVE-2026-71221 Gfs2-utils: gfs2-utils: stack out-of-bounds write via unchecked height in savemeta
Attackers can execute arbitrary code by crafting GFS2 filesystem images that trigger a stack buffer overflow in savemeta due to unchecked height values.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-71221?
CVE-2026-71221 is a high-severity memory corruption vulnerability in Redhat Enterprise Linux, published on 3 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
A stack out-of-bounds write vulnerability was found in gfs2-utils. In savemeta, the height value from on-disk inode metadata is used as a loop bound without bounds checking, causing a stack buffer overflow that may lead to arbitrary code execution when processing crafted GFS2 filesystem images.
Weakness: CWE-787
Which versions are affected by CVE-2026-71221?
It affects 1 product.
Products include Redhat Enterprise Linux.
How do I fix CVE-2026-71221?
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-2026-71221 being exploited?
There is no known exploitation of CVE-2026-71221 in the wild and no public exploit code.
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Sources
Also known as AZL-99900, DEBIAN-CVE-2026-71221, GHSA-6q6f-22jw-g823, UBUNTU-CVE-2026-71221.