smb: client: make use of smbdirect_socket.recv_io.credits.available

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-31535
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:27 UTC
Updated2026-04-28 19:14:33 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: smb: client: make use of smbdirect_socket.recv_io.credits.available The logic off managing recv credits by counting posted recv_io and granted credits is racy. That's because the peer might already consumed a credit, but between receiving the incoming recv at the hardware and processing the completion in the 'recv_done' functions we likely have a window where we grant credits, which don't really exist. So we better have a decicated counter for the available credits, which will be incremented when we posted new recv buffers and drained when we grant the credits to the peer.

Risk And Classification

Primary CVSS: v3.1 4.7 MEDIUM from [email protected]

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

EPSS: 0.000170000 probability, percentile 0.040590000 (date 2026-04-27)

Problem Types: CWE-367

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5fb9b459b3686e366640edd4e62805ef7b4de927 f664e6e8a81103cb45c8802a9bc7499e0902c458 git Not specified
CNA Linux Linux affected 5fb9b459b3686e366640edd4e62805ef7b4de927 be8845ad5d6558703d20567d8702155598325db8 git Not specified
CNA Linux Linux affected 5fb9b459b3686e366640edd4e62805ef7b4de927 9911b1ed187a770a43950bf51f340ad4b7beecba git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.11 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.1 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9911b1ed187a770a43950bf51f340ad4b7beecba 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f664e6e8a81103cb45c8802a9bc7499e0902c458 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/be8845ad5d6558703d20567d8702155598325db8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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