CVE-2026-64158

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> netfs: Fix write streaming disablement if fd open O_RDWR<br /> <br /> In netfs_perform_write(), "write streaming" (the caching of dirty data in<br /> dirty but !uptodate folios) is performed to avoid the need to read data<br /> that is just going to get immediately overwritten. However, this is/will<br /> be disabled in three circumstances: if the fd is open O_RDWR, if fscache is<br /> in use (as we need to round out the blocks for DIO) or if content<br /> encryption is enabled (again for rounding out purposes).<br /> <br /> The idea behind disabling it if the fd is open O_RDWR is that we&amp;#39;d need to<br /> flush the write-streaming page before we could read the data, particularly<br /> through mmap. But netfs now fills in the gaps if -&gt;read_folio() is called<br /> on the page, so that is unnecessary. Further, this doesn&amp;#39;t actually work<br /> if a separate fd is open for reading.<br /> <br /> Fix this by removing the check for O_RDWR, thereby allowing streaming<br /> writes even when we might read.<br /> <br /> This caused a number of problems with the generic/522 xfstest, but those<br /> are now fixed.