CVE-2026-49427
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk20th percentile - higher than 20% of all known CVEs
Summary
Pages belonging to largepage shared memory objects were not explicitly wired. When sendfile(2) transmitted such an object with the SF_NOCACHE flag, it freed the underlying pages after transmission even though existing mappings still referred to them. An unprivileged local user can abuse the bug to access freed kernel memory, which can be exploited to escalate privileges.
Risk Assessment
Access to freed kernel memory may allow an unprivileged user to escalate privileges and gain control of the system.
Recommendation
Apply the vendor patch that ensures proper wiring of largepage object pages or prevents freeing pages while mappings exist. Update the system to a patched version.
Original NVD description (English source)
Pages belonging to largepage shared memory objects were not explicitly wired. When sendfile(2) transmitted such an object with the SF_NOCACHE flag, it freed the underlying pages after transmission even though existing mappings still referred to them. An unprivileged local user can abuse the bug to access freed kernel memory. This can be exploited to escalate privileges.