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CVE-2022-48828

Linux Kernel integer overflow

9.1 CRITICALEPSS 0.63%
  1. Published16 Jul 2024

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().

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

Linux Kernel≥ 5.11 < 5.15.24 · ≥ 5.16 < 5.16.10 · ≥ 5.5 < 5.10.220 · < 5.4.295

Remediation

Fixed in
Linux Kernel≥ 5.15.24

References

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Frequently asked

Is CVE-2022-48828 being actively exploited?

CVE-2022-48828 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.63%.

How severe is CVE-2022-48828?

CVE-2022-48828 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.63% probability of exploitation.

Which products are affected by CVE-2022-48828?

Affected products include Linux Kernel.

How do I fix CVE-2022-48828?

Upgrade affected software to a fixed version, for example Linux Kernel 5.15.24 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.