In the Linux kernel, the following vulnerability has been resolved: xfs: fix wild memcpy access when formatting ondisk rtrefcount btree roots LOLLM… (CVE-2026-98447)

The Linux kernel contained a vulnerability in the XFS filesystem where the inode btree root formatting methods performed a memcpy operation that copied more bytes than intended. Specifically, the code assumed there were two sets of keys in node blocks, but only one set exists. This resulted in wild memory copying beyond the intended buffer boundaries, causing memory corruption. The flaw was identified and resolved, eliminating the unsafe memcpy access when formatting on-disk rtrefcount btree roots.

This vulnerability causes memory corruption in kernel space due to buffer over-read and overwrite during XFS filesystem operations. Such corruption can lead to system instability, crashes, or potential escalation of privileges if exploited. However, no known exploits in the wild have been reported.

A fix for this vulnerability has been implemented in the Linux kernel. Users should update to the fixed kernel version once available from their distribution or vendor. Since this is a kernel-level issue, applying the official patch or upgrading the kernel is the recommended remediation.