{"cve":"CVE-2026-64291","nvd":{"published":"2026-07-25T10:17:09.837","modified":"2026-08-17T05:17:28.620","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Set veventq_depth upper bound\n\niommufd_veventq_alloc() accepts any !0 veventq_depth from userspace, with\nan upper bound at U32_MAX.\n\nThis leaves a vulnerability where userspace can allocate excessively large\nqueues to exhaust kernel memory reserves.\n\nCap the veventq_depth (maximum number of entries) to 1 << 19, matching the\nmaximum number of entries in the SMMUv3 EVTQ (the largest use case today).","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/6ebf2eb46fbd5b40393ff8fbb847ba96925beaff","https://git.kernel.org/stable/c/e7b5e55652746b1221b9c10ff80eae8a154101ba","https://git.kernel.org/stable/c/f565297edf316016be4a1a9e2eb9f39359313f43"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:46:40.600842820+00:00"},"epss":{"cve":"CVE-2026-64291","score":0.0016,"percentile":0.05174,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}