CVE-2022-48828
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().
How to fix
- linux linux_kernel5.4.295, 5.10.220, 5.15.24, 5.16.10 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | v < 5.4.295, 5.5 ≤ v < 5.10.220, 5.11 ≤ v < 5.15.24, 5.16 ≤ v < 5.16.10, 5.17 | 5.4.295, 5.10.220, 5.15.24, 5.16.10 |
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