# CVE-2026-89673

## Summary

- **CVE ID:** CVE-2026-89673
- **Severity:** UNKNOWN
- **CVSS Score:** 1.51
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 16, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:

nfsd: fix XDR padding calculation in ff_encode_getdeviceinfo

nfsd4_ff_encode_getdeviceinfo() computes the da_addr_body reservation
as 16 + netid_len + addr_len, but the subsequent xdr_encode_opaque()
calls emit 8 + round_up(netid_len, 4) + round_up(addr_len, 4) bytes.
The mismatch means the declared da_addr_body length exceeds the actual
encoded data by 2-8 bytes on every flexfile GETDEVICEINFO reply,
leaking stale reply-page content to the client and mis-aligning the
subsequent version list decode.

Use xdr_align_size() for each string length to match what
xdr_encode_opaque() actually writes.

## Affected Products

- Linux — Linux (efcae97fa425ca6db9d126e37daccf2d7225cb09)
- Linux — Linux (6.4.16)

## References

- [CNA](https://git.kernel.org/stable/c/74015b7be806ad9e21d46f7bd2831df280c6c783)
- [CNA](https://git.kernel.org/stable/c/41ebca28e17f84293650598f86bd69532ec1a8e0)
- [CNA](https://git.kernel.org/stable/c/62e5949f0dd5ec837af144860ff908369df4c7c9)
- [CNA](https://git.kernel.org/stable/c/8b989aaec85e1293a871d602590c951fe44b8647)
- [CNA](https://git.kernel.org/stable/c/88bce7e326c368d7df15126ccac537e54bebd467)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.20%
- **EPSS Percentile:** 10.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._