by Kastro CVE-2022-48828
Linux Linux — NFSD: Fix ia_size underflow
Description · from the CVE record
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().
Affected
ProductAffectedFixed inSource
Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < d2211e6e34d0755f35e2f8c22d81999fa81cfc71d2211e6e34d0755f35e2f8c22d81999fa81cfc71CNA
Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 38d02ba22e43b6fc7d291cf724bc6e3b7be6626b38d02ba22e43b6fc7d291cf724bc6e3b7be6626bCNA
Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 8e0ecaf7a7e57b30284d6b3289cc436100fadc488e0ecaf7a7e57b30284d6b3289cc436100fadc48CNA
Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < da22ca1ad548429d7822011c54cfe210718e0aa7da22ca1ad548429d7822011c54cfe210718e0aa7CNA
Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < e6faac3f58c7c4176b66f63def17a34232a17b0ee6faac3f58c7c4176b66f63def17a34232a17b0eCNA
Linux2.6.12–CNA
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem< V1.1.1V1.1.1siemens-SADP
Scores by source
Linux (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial