{"id":"CVE-2026-64291","summary":"iommufd: Set veventq_depth upper bound","details":"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 \u003c\u003c 19, matching the\nmaximum number of entries in the SMMUv3 EVTQ (the largest use case today).","modified":"2026-08-18T03:31:01.732885553Z","published":"2026-07-25T08:49:30.686Z","related":["CGA-p8rq-9mp2-v339","openSUSE-SU-2026:11476-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64291.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/6ebf2eb46fbd5b40393ff8fbb847ba96925beaff"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e7b5e55652746b1221b9c10ff80eae8a154101ba"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f565297edf316016be4a1a9e2eb9f39359313f43"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64291.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64291"},{"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":"e36ba5ab808ef6237c3148d469c8238674230e2b"},{"fixed":"f565297edf316016be4a1a9e2eb9f39359313f43"},{"fixed":"e7b5e55652746b1221b9c10ff80eae8a154101ba"},{"fixed":"6ebf2eb46fbd5b40393ff8fbb847ba96925beaff"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64291.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.15.0"},{"fixed":"6.18.39"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64291.json"}}],"schema_version":"1.9.0"}