{"id":"CVE-2026-63889","summary":"scsi: scsi_transport_fc: Widen FPIN pname walker counter to u32","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: scsi_transport_fc: Widen FPIN pname walker counter to u32\n\nAn adjacent Fibre Channel fabric actor that can deliver an FPIN ELS\nframe to an lpfc or qla2xxx Linux initiator can trigger a non-return in\nthe generic FC transport. This is not a local userspace or IP network\npath; the attacker must be able to inject fabric traffic, for example as\na compromised switch or fabric controller, or as a same-zone N_Port on a\nfabric that permits source spoofing.\n\nThe Link-Integrity and Peer-Congestion FPIN walkers used a u8 loop\ncounter against the 32-bit on-wire pname_count field, and did not bound\npname_count by the descriptor body already validated by the TLV walker.\nA pname_count of 256 therefore wraps the counter and keeps the loop\ncondition true indefinitely.\n\nFactor the shared pname_list[] walk into one helper, widen the counter\nto u32, and clamp pname_count against the entries that fit in the\ndescriptor body before iterating.","modified":"2026-07-22T05:29:58.361574078Z","published":"2026-07-19T14:55:01.515Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63889.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/07776b7779c9426982c1ad74aad91bd531593790"},{"type":"WEB","url":"https://git.kernel.org/stable/c/163bd704d7515c3df6c2e03bcba93d1db79edbff"},{"type":"WEB","url":"https://git.kernel.org/stable/c/29f126f09e34a425b376b3646c89aa7cc18b142c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/35461d23744175a78b6280293892cca357c22793"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a9a39233ec1fc9f97ea1340a4d09bb7ec2be5153"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bdff76dff6ec23d6fe35812fa33e5c4ce2cdb770"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ee57b89e5da9fffbe0d26647e4ff0750dacb9943"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63889.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63889"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3dcfe0de5a9752e646a61f4ce513ac059960c7c3"},{"fixed":"07776b7779c9426982c1ad74aad91bd531593790"},{"fixed":"29f126f09e34a425b376b3646c89aa7cc18b142c"},{"fixed":"163bd704d7515c3df6c2e03bcba93d1db79edbff"},{"fixed":"ee57b89e5da9fffbe0d26647e4ff0750dacb9943"},{"fixed":"35461d23744175a78b6280293892cca357c22793"},{"fixed":"bdff76dff6ec23d6fe35812fa33e5c4ce2cdb770"},{"fixed":"a9a39233ec1fc9f97ea1340a4d09bb7ec2be5153"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63889.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.210"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.176"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.143"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.93"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.35"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.12"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63889.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"}]}