CVE-2022-48828

NFSD: Fix ia_size underflow

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().

N/A

CVSS

Severity:

EPSS 0.07%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/38d02ba22e43b6fc7d291cf724bc6e3b7be6626b
https://git.kernel.org/stable/c/8e0ecaf7a7e57b30284d6b3289cc436100fadc48
https://git.kernel.org/stable/c/da22ca1ad548429d7822011c54cfe210718e0aa7
https://git.kernel.org/stable/c/e6faac3f58c7c4176b66f63def17a34232a17b0e

Frequently Asked Questions

What is the severity of CVE-2022-48828?: CVE-2022-48828 has not yet been assigned a CVSS score.
How to fix CVE-2022-48828?: To fix CVE-2022-48828, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-48828 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2022-48828 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-48828?: CVE-2022-48828 affects Linux Linux, Linux Linux.

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