{"id":"CVE-2026-64291","state":"PUBLISHED","title":"iommufd: Set veventq_depth upper bound","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).","publishedAt":"2026-07-25T08:49:30.686Z","updatedAt":"2026-08-17T04:52:48.275Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e36ba5ab808ef6237c3148d469c8238674230e2b","status":"affected","lessThan":"f565297edf316016be4a1a9e2eb9f39359313f43","versionType":"git"},{"version":"e36ba5ab808ef6237c3148d469c8238674230e2b","status":"affected","lessThan":"e7b5e55652746b1221b9c10ff80eae8a154101ba","versionType":"git"},{"version":"e36ba5ab808ef6237c3148d469c8238674230e2b","status":"affected","lessThan":"6ebf2eb46fbd5b40393ff8fbb847ba96925beaff","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/iommufd/eventq.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.15","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/iommufd/eventq.c"]}],"references":["https://git.kernel.org/stable/c/f565297edf316016be4a1a9e2eb9f39359313f43","https://git.kernel.org/stable/c/e7b5e55652746b1221b9c10ff80eae8a154101ba","https://git.kernel.org/stable/c/6ebf2eb46fbd5b40393ff8fbb847ba96925beaff"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64291.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64291","state":"PUBLISHED","datePublished":"2026-07-25T08:49:30.686Z","dateUpdated":"2026-08-17T04:52:48.275Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.778Z"},"containers":{"cna":{"title":"iommufd: Set veventq_depth upper bound","descriptions":[{"lang":"en","value":"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)."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e36ba5ab808ef6237c3148d469c8238674230e2b","status":"affected","lessThan":"f565297edf316016be4a1a9e2eb9f39359313f43","versionType":"git"},{"version":"e36ba5ab808ef6237c3148d469c8238674230e2b","status":"affected","lessThan":"e7b5e55652746b1221b9c10ff80eae8a154101ba","versionType":"git"},{"version":"e36ba5ab808ef6237c3148d469c8238674230e2b","status":"affected","lessThan":"6ebf2eb46fbd5b40393ff8fbb847ba96925beaff","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/iommufd/eventq.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.15","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/iommufd/eventq.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/f565297edf316016be4a1a9e2eb9f39359313f43"},{"url":"https://git.kernel.org/stable/c/e7b5e55652746b1221b9c10ff80eae8a154101ba"},{"url":"https://git.kernel.org/stable/c/6ebf2eb46fbd5b40393ff8fbb847ba96925beaff"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:52:48.275Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}