CVE-2026-63889
CVE CVE-2026-63889EUVD EUVD-2026-45662Published 2026-07-19T14:55:01.000ZLast changed 2026-08-05T12:36:58.000ZCVSS 8.1
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 6.1.176; 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 <ee57b89e5da9fffbe0d26647e4ff0750dacb9943; patch: 6.18.35; 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 <bdff76dff6ec23d6fe35812fa33e5c4ce2cdb770; patch: 7.1; 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 <29f126f09e34a425b376b3646c89aa7cc18b142c; patch: 6.6.143; patch: 0; 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 <a9a39233ec1fc9f97ea1340a4d09bb7ec2be5153; patch: 6.12.93; patch: 7.0.12; 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 <163bd704d7515c3df6c2e03bcba93d1db79edbff; 5.11; 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 <07776b7779c9426982c1ad74aad91bd531593790; 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 <35461d23744175a78b6280293892cca357c22793; patch: 5.15.210
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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