CVE-2022-48828

medium

Description

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().

References

https://git.kernel.org/stable/c/e6faac3f58c7c4176b66f63def17a34232a17b0e

https://git.kernel.org/stable/c/da22ca1ad548429d7822011c54cfe210718e0aa7

https://git.kernel.org/stable/c/8e0ecaf7a7e57b30284d6b3289cc436100fadc48

https://git.kernel.org/stable/c/38d02ba22e43b6fc7d291cf724bc6e3b7be6626b

Details

Source: Mitre, NVD

Published: 2024-07-16

Updated: 2024-07-16

Risk Information

CVSS v2

Base Score: 4.6

Vector: CVSS2#AV:L/AC:L/Au:S/C:N/I:N/A:C

Severity: Medium

CVSS v3

Base Score: 5.5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Severity: Medium