scsi: scsi_transport_fc: Widen FPIN pname walker counter to u32

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63889
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:06 UTC
Updated2026-07-20 15:16:54 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: scsi: scsi_transport_fc: Widen FPIN pname walker counter to u32 An adjacent Fibre Channel fabric actor that can deliver an FPIN ELS frame to an lpfc or qla2xxx Linux initiator can trigger a non-return in the generic FC transport. This is not a local userspace or IP network path; the attacker must be able to inject fabric traffic, for example as a compromised switch or fabric controller, or as a same-zone N_Port on a fabric that permits source spoofing. The Link-Integrity and Peer-Congestion FPIN walkers used a u8 loop counter against the 32-bit on-wire pname_count field, and did not bound pname_count by the descriptor body already validated by the TLV walker. A pname_count of 256 therefore wraps the counter and keeps the loop condition true indefinitely. Factor the shared pname_list[] walk into one helper, widen the counter to u32, and clamp pname_count against the entries that fit in the descriptor body before iterating.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001960000 probability, percentile 0.096010000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 07776b7779c9426982c1ad74aad91bd531593790 git Not specified
CNA Linux Linux affected 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 29f126f09e34a425b376b3646c89aa7cc18b142c git Not specified
CNA Linux Linux affected 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 163bd704d7515c3df6c2e03bcba93d1db79edbff git Not specified
CNA Linux Linux affected 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 ee57b89e5da9fffbe0d26647e4ff0750dacb9943 git Not specified
CNA Linux Linux affected 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 35461d23744175a78b6280293892cca357c22793 git Not specified
CNA Linux Linux affected 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 bdff76dff6ec23d6fe35812fa33e5c4ce2cdb770 git Not specified
CNA Linux Linux affected 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 a9a39233ec1fc9f97ea1340a4d09bb7ec2be5153 git Not specified
CNA Linux Linux affected 5.11 Not specified
CNA Linux Linux unaffected 5.11 semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.93 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.35 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.12 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ee57b89e5da9fffbe0d26647e4ff0750dacb9943 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/35461d23744175a78b6280293892cca357c22793 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/163bd704d7515c3df6c2e03bcba93d1db79edbff 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/07776b7779c9426982c1ad74aad91bd531593790 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a9a39233ec1fc9f97ea1340a4d09bb7ec2be5153 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/29f126f09e34a425b376b3646c89aa7cc18b142c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bdff76dff6ec23d6fe35812fa33e5c4ce2cdb770 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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