Stack OOB Write in RedHat gfs2-utils savemeta Arbitrary Code Execution
CVE-2026-71221 Published on September 3, 2026
Gfs2-utils: gfs2-utils: stack out-of-bounds write via unchecked height in savemeta
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.
Vulnerability Analysis
CVE-2026-71221 can be exploited with local system access, requires user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Timeline
Reported to Red Hat.
Made public. 85 days later.
Weakness Type
What is a Memory Corruption Vulnerability?
The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.
CVE-2026-71221 has been classified to as a Memory Corruption vulnerability or weakness.
Products Associated with CVE-2026-71221
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