CVE-2026-68149

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> fs: preserve ACL_DONT_CACHE state in forget_cached_acl()<br /> <br /> The ACL_DONT_CACHE state is meant to be a constant state for the inode<br /> for filesystems that want to opt out of posix acl caching.<br /> <br /> Commit facd61053cff1 ("fuse: fixes after adapting to new posix acl api")<br /> used this facility to opt out of posix acl caching for fuse inodes with<br /> fuse server that does not negotiate FUSE_POSIX_ACL (fc-&gt;posix_acl).<br /> <br /> The commit also takes care to gate the forget_all_cached_acls() call in<br /> fuse_set_acl() on fc-&gt;posix_acl because there is no need for it, but<br /> there are other placed in fuse code which call forget_all_cached_acls()<br /> unconditional to fc-&gt;posix_acl and those cause the loss of the<br /> ACL_DONT_CACHE state.<br /> <br /> This is not only a functional bug. Properly timed, a get_acl() from this<br /> fuse filesystem can return a stale cached value, as was observed in tests,<br /> because set_acl() does not invalidate the unintentional acl cache.<br /> <br /> We could fix this in fuse, but it actually makes no sense for the vfs<br /> helper forget_cached_acl() to invalidate the ACL_DONT_CACHE state, so<br /> let it not do that to fix fuse and future users of ACL_DONT_CACHE.