CVE-2026-89673

CVE-2026-89673: vulnerability in Linux

nfsd: fix XDR padding calculation in ff_encode_getdeviceinfo

Published · Updated

3Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackepss 0.2%
exploitation probability
0.2%top 90% of all CVEs
observed exploitation
nono source reports it
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
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References
https://git.kernel.org/stable/c/41ebca28e17f84293650598f86bd69532ec1a8e0https://git.kernel.org/stable/c/62e5949f0dd5ec837af144860ff908369df4c7c9https://git.kernel.org/stable/c/74015b7be806ad9e21d46f7bd2831df280c6c783https://git.kernel.org/stable/c/88bce7e326c368d7df15126ccac537e54bebd467https://git.kernel.org/stable/c/8b989aaec85e1293a871d602590c951fe44b8647