CVE-2026-53155

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the memory management subsystem where the set pmd migration entry() function incorrectly uses pmd write(), pmd soft dirty(), and pmd uffd wp() to determine the state of installed migration entries for device-private PMD entries. On x86-64 architectures, pmd write() may return the softdirty state instead of the actual write state, which can lead to a corrupted rmap state. This occurs when a child process writes to a range and migrates it to RAM, causing the system to incorrectly install writable entries for both parent and child mappings. This inconsistency can trigger an assertion failure in the folio add anon rmap() function when an AnonExclusive folio is found to have a mapcount greater than one.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.