CVE-2022-48828

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().

Affected Software

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

• https://git.kernel.org/stable/c/38d02ba22e43b6fc7d291cf724bc6e3b7be6626b
• https://git.kernel.org/stable/c/8e0ecaf7a7e57b30284d6b3289cc436100fadc48
• https://git.kernel.org/stable/c/da22ca1ad548429d7822011c54cfe210718e0aa7
• https://git.kernel.org/stable/c/e6faac3f58c7c4176b66f63def17a34232a17b0e

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

Additional References

• https://cert-portal.siemens.com/productcert/html/ssa-265688.html
• https://cert-portal.siemens.com/productcert/html/ssa-355557.html

References

• https://git.kernel.org/stable/c/d2211e6e34d0755f35e2f8c22d81999fa81cfc71
• https://git.kernel.org/stable/c/38d02ba22e43b6fc7d291cf724bc6e3b7be6626b
• https://git.kernel.org/stable/c/8e0ecaf7a7e57b30284d6b3289cc436100fadc48
• https://git.kernel.org/stable/c/da22ca1ad548429d7822011c54cfe210718e0aa7
• https://git.kernel.org/stable/c/e6faac3f58c7c4176b66f63def17a34232a17b0e

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