NFSv4/pnfs: key the data server cache on the NFS version

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90102
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:01 UTC
Updated2026-09-18 18:17:41 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: NFSv4/pnfs: key the data server cache on the NFS version nfs4_pnfs_ds_add() keys the per-net data server cache on the multipath address set alone, and struct nfs4_pnfs_ds records no version. That suffices for the files layout driver, which always connects with version 4, but flexfiles takes its version tuple from GETDEVICEINFO per device, and one address can legitimately serve both NFSv3 and NFSv4. Two deviceids on one address with different ds_versions[0].version therefore share a single nfs4_pnfs_ds, and whichever mirror connects first pins ds_clp to its own version. The other one is handed that client anyway, so it selects rpc_call_ops for a version the connection does not speak, and the mismatched sequence-slot handling dereferences NULL. Add the version to the cache key so the two cannot alias, giving each version its own nfs4_pnfs_ds and connection while both mirrors stay usable. Only the major version is compared, since that is what selects rpc_call_ops and rpc_ops; v4.0 and v4.1 keep sharing a client. The files layout driver passes the 4 it already hardcodes at connect time.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.006770000 probability, percentile 0.504610000 (date 2026-09-21)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d67ae825a59d639e4d8b82413af84d854617a87e ffb100b0da0e217d5d63ce6fe092f9c29e59f7dd git Not specified
CNA Linux Linux affected d67ae825a59d639e4d8b82413af84d854617a87e 02e160922bc83cd25e346a028ed43cbdb0b57e1a git Not specified
CNA Linux Linux affected d67ae825a59d639e4d8b82413af84d854617a87e bc7aa9d8aff826031ffe25eba7f2f3acafcbf7a1 git Not specified
CNA Linux Linux affected d67ae825a59d639e4d8b82413af84d854617a87e dd5bd091daa48c6ed8f9235ddf448aa288a0881f git Not specified
CNA Linux Linux affected d67ae825a59d639e4d8b82413af84d854617a87e f2994ba1263d9e88d3d9ae1d097c5cf811d4bfa5 git Not specified
CNA Linux Linux affected d67ae825a59d639e4d8b82413af84d854617a87e 27f640cd92eebf5c2f64336be7ca24f4636390cb git Not specified
CNA Linux Linux affected d67ae825a59d639e4d8b82413af84d854617a87e bbc975cfb07a146843fde1126c43441e76177539 git Not specified
CNA Linux Linux affected d67ae825a59d639e4d8b82413af84d854617a87e 13c23c5cb977f66390795437fd3837887ce1fd75 git Not specified
CNA Linux Linux affected 4.0 Not specified
CNA Linux Linux unaffected 4.0 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/13c23c5cb977f66390795437fd3837887ce1fd75 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/27f640cd92eebf5c2f64336be7ca24f4636390cb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dd5bd091daa48c6ed8f9235ddf448aa288a0881f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/02e160922bc83cd25e346a028ed43cbdb0b57e1a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ffb100b0da0e217d5d63ce6fe092f9c29e59f7dd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bc7aa9d8aff826031ffe25eba7f2f3acafcbf7a1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bbc975cfb07a146843fde1126c43441e76177539 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f2994ba1263d9e88d3d9ae1d097c5cf811d4bfa5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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