Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
Several file systems were not properly initializing the d_off field
of the dirent structures returned by VOP_READDIR. In particular,
tmpfs(5), smbfs(5), autofs(5) and mqueuefs(5) were failing to do so.
As a result, eight uninitialized kernel stack bytes may be leaked to
userspace by these file systems. This problem is not present in
Additionally, msdosfs(5) was failing to zero-fill a pair of padding
fields in the dirent structure, resulting in a leak of three
Kernel stack disclosures may leak sensitive information which could
be used to compromise the security of the system.