CVE-2026-63889High· 8.1▾ TwilightIn 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 i…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 44.6 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.4%
Last analysed / modified upstream
0.4% → 0.4%
In 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.
Linux >= 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 < 07776b7779c9426982c1ad74aad91bd531593790Linux >= 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 < 29f126f09e34a425b376b3646c89aa7cc18b142cLinux >= 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 < 163bd704d7515c3df6c2e03bcba93d1db79edbffLinux >= 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 < ee57b89e5da9fffbe0d26647e4ff0750dacb9943Linux >= 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 < 35461d23744175a78b6280293892cca357c22793Linux >= 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 < bdff76dff6ec23d6fe35812fa33e5c4ce2cdb770Linux >= 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 < a9a39233ec1fc9f97ea1340a4d09bb7ec2be5153Linux 5.11Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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