Answer in brief
CVE-2026-63889 records a High severity (CVSS 8.1) vulnerability in scsi: scsi_transport_fc: Widen FPIN pname walker counter to u32. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=3dcfe0de5a9752e646a61f4ce513ac059960c7c3 <07776b7779c9426982c1ad74aad91bd531593790 || >=3dcfe0de5a9752e646a61f4ce513ac059960c7c3 <29f126f09e34a425b376b3646c89aa7cc18b142c || >=3dcfe0de5a9752e646a61f4ce513ac059960c7c3 <163bd704d7515c3df6c2e03bcba93d1db79edbff || >=3dcfe0de5a9752e646a61f4ce513ac059960c7c3 <ee57b89e5da9fffbe0d26647e4ff0750dacb9943 || >=3dcfe0de5a9752e646a61f4ce513ac059960c7c3 <35461d23744175a78b6280293892cca357c22793 || >=3dcfe0de5a9752e646a61f4ce513ac059960c7c3 <bdff76dff6ec23d6fe35812fa33e5c4ce2cdb770 || >=3dcfe0de5a9752e646a61f4ce513ac059960c7c3 <a9a39233ec1fc9f97ea1340a4d09bb7ec2be5153 | 07776b7779c9426982c1ad74aad91bd531593790, 29f126f09e34a425b376b3646c89aa7cc18b142c, 163bd704d7515c3df6c2e03bcba93d1db79edbff, ee57b89e5da9fffbe0d26647e4ff0750dacb9943, 35461d23744175a78b6280293892cca357c22793, bdff76dff6ec23d6fe35812fa33e5c4ce2cdb770, a9a39233ec1fc9f97ea1340a4d09bb7ec2be5153 |
| Linux/Linuxgeneric | 5.11 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 29, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.