CVE-2026-63875

A flaw was found in the Linux kernel, specifically within the arm64 architecture's Translation Lookaside Buffer (TLB) management. When a Page Middle Directory (PMD) table was unshared, the TLB flush operation did not correctly invalidate entries in the walk cache. This oversight could leave stale PMD page table entries, potentially leading to incorrect page table walks. Such an issue can enable an attacker to access unauthorized memory regions, potentially resulting in information disclosure or privilege escalation.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.