{"containers":{"cna":{"affected":[{"product":"XenServer","vendor":"Cloud Software Group","versions":[{"status":"affected","version":"all","versionType":"custom"}]},{"product":"XCP-ng","vendor":"Vates","versions":[{"status":"affected","version":"all","versionType":"custom"}]}],"credits":[{"lang":"en","type":"finder","value":"Jakob Wolffhechel, Moksha"}],"descriptions":[{"lang":"en","value":"A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can write an arbitrary string to the kernel I/O scheduler sysfs interface by setting the scheduler key in SR.other_config. The SM driver reads the value at SR.py:203-224 and passes it to util.set_scheduler, which writes it to /sys/block/*/queue/scheduler with zero XAPI-side validation. The kernel validates the value (rejecting unknown schedulers), limiting direct impact. The concern is the architectural pattern: user-controlled XAPI data flows directly to a kernel control interface. The field has no map_keys_roles entries for infrastructure keys."}],"metrics":[{"cvssV3_1":{"baseScore":3.8,"baseSeverity":"LOW","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"format":"CVSS"},{"cvssV4_0":{"baseScore":5.1,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-20","description":"Improper Input Validation","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-862","description":"Missing Authorization","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-04-24T06:00:00Z","orgId":"moksha.dk","shortName":"Moksha"},"references":[{"url":"https://cna.moksha.dk/MOKSHA-2026-0080"}],"title":"I/O Scheduler Sysfs Injection via SR.other_config scheduler"}},"cveMetadata":{"alternateIds":["GCVE-117-2026-0080"],"assignerOrgId":"moksha.dk","cveId":"MOKSHA-2026-0080","datePublished":"2026-04-24T06:00:00Z","state":"PUBLISHED","x_moksha_note":"Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."},"dataType":"CVE_RECORD","dataVersion":"5.1","vulnerability-lookup:id":"moksha-2026-0080","vulnerability-lookup:score":1777010400.0}