CVE-2022-48829: NFSD: Fix NFSv3 SETATTR/CREATE's handling of large file sizes

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-07-16 · updated 2026-10-14

Description

In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix NFSv3 SETATTR/CREATE's handling of large file sizes iattr::ia_size is a loff_t, so these NFSv3 procedures must be careful to deal with incoming client size values that are larger than s64_max without corrupting the value. Silently capping the value results in storing a different value than the client passed in which is unexpected behavior, so remove the min_t() check in decode_sattr3(). Note that RFC 1813 permits only the WRITE procedure to return NFS3ERR_FBIG. We believe that NFSv3 reference implementations also return NFS3ERR_FBIG when ia_size is too large.

Affected products

Linux 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; 5.17-rc1, 5.17-rc2, 5.17-rc3 — fixed in 5.10.220, 5.15.24, 5.16.10, 5.4.295

How to fix

Upgrade to a fixed version: Linux kernel 5.10.220, 5.15.24, 5.16.10, 5.4.295. Check the vendor advisory for mitigations.

References

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