NFSD: Fix ia_size underflow
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 5.4.295, 5.10.220, 5.15.24, 5.16.10
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
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().
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in d2211e6e34d0755f35e2f8c22d81999fa81cfc71; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 38d02ba22e43b6fc7d291cf724bc6e3b7be6626b; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 8e0ecaf7a7e57b30284d6b3289cc436100fadc48; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in da22ca1ad548429d7822011c54cfe210718e0aa7; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in e6faac3f58c7c4176b66f63def17a34232a17b0e
- Linux Linux
2.6.12
- KernelLinux
From 2.6.12 · fixed in 5.4.295; From 5.5.0 · fixed in 5.10.220; From 5.11.0 · fixed in 5.15.24; From 5.16.0 · fixed in 5.16.10