NFSv4: include MAY_WRITE in open permission mask for O_TRUNC

...

CVE-2026-64298

In the Linux kernel, the following vulnerability has been resolved: NFSv4: include MAYWRITE in open permission mask for OTRUNC POSIX requires write permission to truncate a file, so an open that specifies OTRUNC must be authorized for write access regardless of the OACCMODE access mode...

UBUNTU-CVE-2026-64298

In the Linux kernel, the following vulnerability has been resolved: NFSv4: include MAYWRITE in open permission mask for OTRUNC POSIX requires write permission to truncate a file, so an open that specifies OTRUNC must be authorized for write access regardless of the OACCMODE access mode...

PT-2026-64519

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in the NFSv4 implementation where the nfs open permission mask function fails to include MAY WRITE in the access mask when the O TRUNC flag is used during a file open...