UnratedFix available
nfsd: fix XDR padding calculation in ff_encode_getdeviceinfo
Type: advisorySources: OSV
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.270, 5.15.221, 6.1.188, 6.12.109, 6.18.50, 6.6.157, 7.2.4
- CVEs
- CVE-2026-89673
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 21:27 UTC · Revision 1
Source evidence
nfsd: fix XDR padding calculation in ff_encode_getdeviceinfo
core-osv · Original sourcePublished 11 Sept 2026, 19:45 UTC
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.
osv:CVE-2026-89673
Kernel
Fixed versions: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4
Complete source record
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"modified": "2026-10-28T02:30:39.645967115Z",
"provider": "osv",
"references": [
"https://git.kernel.org/stable/c/15460c8e6c9bc92cda8f68bc419ac082300ab3d6",
"https://git.kernel.org/stable/c/356decf074b82bac5564568203c12426dcea3470",
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"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89673.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-89673",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89673.json"
}
},
"related_cves": [
{
"value": "CVE-2026-89673",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 507257,
"published_at": "2026-09-11T19:45:58.149+00:00"
}