CVE-2026-52944 ksmbd: fix FSCTL permission bypass by adding a permission check for FSCTL_SET_SPARSE

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix FSCTL permission bypass by adding a permission check for FSCTLSETSPARSE FSCTLSETSPARSE in fsctlsetsparse modifies the file's sparse attribute and saves it through xattr without any permission checks. This exposes two...

PT-2026-51759

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description In the Linux kernel, the fsctl set sparse function fails to perform necessary permission checks when processing the FSCTL SET SPARSE operation. This allows a client on a read-only share ...