NetSight
IP …
critical9.1

CVE-2022-48828

In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix ia_size underflow iattr::ia_size is a loff_t, which is a signed 64-bit type.

Impact

In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix ia_size underflow iattr::ia_size is a loff_t, which is a signed 64-bit type. NFSv3 and NFSv4 both define file size as an unsigned 64-bit type. Thus there is a range of valid file size values an NFS client can send that is already larger than Linux can handle. Currently decode_fattr4() dumps a full u64 value into ia_size. If that value happens to be larger than S64_MAX, then ia_size underflows. I'm about to fix up the NFSv3 behavior as well, so let's catch the underflow in the common code path: nfsd_setattr().

Affected products

VendorProductAffected versions
LinuxLinux Kernel
before 5.4.295
from 5.5 before 5.10.220
from 5.11 before 5.15.24
from 5.16 before 5.16.10
Version 5.17

Weakness classification

CWE-191

References