CVE-2026-64158

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

Description An issue exists in the netfs perform write() function where write streaming—the process of caching dirty data in dirty but !uptodate folios to avoid reading data that will be immediately overwritten—was incorrectly disabled when a file descriptor was opened with the O RDWR flag. This restriction was intended to prevent the need to flush write-streaming pages before reading data, particularly via mmap, but it became unnecessary as the system now fills gaps when read folio() is called. Additionally, the restriction was ineffective if a separate file descriptor was open for reading.

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