CVE-2026-64294

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

Description Inode ownership checks used for side-channel protection in the mincore() and madvise(MADV PAGEOUT) functions were incorrectly performed against the nop mnt idmap, which ignores the idmap of the file's mount. This can lead to situations where the owner or capable() check fails even when a user should have ownership after idmap translation. To resolve this, the file owner or capable() function was introduced to ensure correct semantics for ownership checks.

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