CVE-2026-89673

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.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/41ebca28e17f84293650598f86bd69532ec1a8e0
https://git.kernel.org/stable/c/62e5949f0dd5ec837af144860ff908369df4c7c9
https://git.kernel.org/stable/c/74015b7be806ad9e21d46f7bd2831df280c6c783
https://git.kernel.org/stable/c/88bce7e326c368d7df15126ccac537e54bebd467
https://git.kernel.org/stable/c/8b989aaec85e1293a871d602590c951fe44b8647

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-11 20:19

Updated : 2026-09-14 13:19

NVD link : CVE-2026-89673

Mitre link : CVE-2026-89673

CVE.ORG link : CVE-2026-89673

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2026-89673", "cveTags": [], "metrics": {}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "efcae97fa425ca6db9d126e37daccf2d7225cb09", "lessThan": "88bce7e326c368d7df15126ccac537e54bebd467", "versionType": "git"}, {"status": "affected", "version": "efcae97fa425ca6db9d126e37daccf2d7225cb09", "lessThan": "74015b7be806ad9e21d46f7bd2831df280c6c783", "versionType": "git"}, {"status": "affected", "version": "efcae97fa425ca6db9d126e37daccf2d7225cb09", "lessThan": "41ebca28e17f84293650598f86bd69532ec1a8e0", "versionType": "git"}, {"status": "affected", "version": "efcae97fa425ca6db9d126e37daccf2d7225cb09", "lessThan": "62e5949f0dd5ec837af144860ff908369df4c7c9", "versionType": "git"}, {"status": "affected", "version": "efcae97fa425ca6db9d126e37daccf2d7225cb09", "lessThan": "8b989aaec85e1293a871d602590c951fe44b8647", "versionType": "git"}], "programFiles": ["fs/nfsd/flexfilelayoutxdr.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.4.16", "lessThan": "6.6.157", "versionType": "semver"}, {"status": "affected", "version": "6.4.16", "lessThan": "6.12.109", "versionType": "semver"}, {"status": "affected", "version": "6.4.16", "lessThan": "6.18.50", "versionType": "semver"}, {"status": "affected", "version": "6.4.16", "lessThan": "7.2.4", "versionType": "semver"}, {"status": "affected", "version": "6.4.16", "lessThan": "7.3-rc1", "versionType": "semver"}], "programFiles": ["fs/nfsd/flexfilelayoutxdr.c"], "defaultStatus": "unaffected"}]}], "published": "2026-09-11T20:19:53.890", "references": [{"url": "https://git.kernel.org/stable/c/41ebca28e17f84293650598f86bd69532ec1a8e0", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/62e5949f0dd5ec837af144860ff908369df4c7c9", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/74015b7be806ad9e21d46f7bd2831df280c6c783", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/88bce7e326c368d7df15126ccac537e54bebd467", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/8b989aaec85e1293a871d602590c951fe44b8647", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix XDR padding calculation in ff_encode_getdeviceinfo\n\nnfsd4_ff_encode_getdeviceinfo() computes the da_addr_body reservation\nas 16 + netid_len + addr_len, but the subsequent xdr_encode_opaque()\ncalls emit 8 + round_up(netid_len, 4) + round_up(addr_len, 4) bytes.\nThe mismatch means the declared da_addr_body length exceeds the actual\nencoded data by 2-8 bytes on every flexfile GETDEVICEINFO reply,\nleaking stale reply-page content to the client and mis-aligning the\nsubsequent version list decode.\n\nUse xdr_align_size() for each string length to match what\nxdr_encode_opaque() actually writes."}], "lastModified": "2026-09-14T13:19:19.333", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}