In the Linux kernel, the following vulnerability has been resolved:
smb: client: discard post-EOF pagecache when extending a file via zero range
smb3_zero_range() removed the pagecache only for the range being zeroed,
so when it extends the file the folio straddling the old EOF – which may
hold data dirtied past EOF through an mmap – was never dropped and became
visible as file content once the file was extended.
Lower the discard boundary to the smaller of the zero-range offset and the
old EOF.
