{"id":"CVE-2026-64290","state":"PUBLISHED","title":"iommufd: Break the loop on failure in iommufd_fault_fops_read()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Break the loop on failure in iommufd_fault_fops_read()\n\nOn a copy_to_user() failure inside the inner list_for_each_entry, only the\ninner loop breaks; the outer while re-fetches the just-restored fault group\nand retries the failing copy_to_user() forever, spinning the reader at 100%\nCPU with fault->mutex held.\n\nCheck rc after the inner loop and break the outer while as well.","publishedAt":"2026-07-25T08:49:30.049Z","updatedAt":"2026-08-17T04:52:47.176Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"07838f7fd529c8a6de44b601d4b7057e6c8d36ed","status":"affected","lessThan":"a38e0714affc5c0bbb40cba5a65d6d32a5e72a71","versionType":"git"},{"version":"07838f7fd529c8a6de44b601d4b7057e6c8d36ed","status":"affected","lessThan":"5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8","versionType":"git"},{"version":"07838f7fd529c8a6de44b601d4b7057e6c8d36ed","status":"affected","lessThan":"f66c16b175509642ee7082df57c9bf3deaebae1a","versionType":"git"},{"version":"07838f7fd529c8a6de44b601d4b7057e6c8d36ed","status":"affected","lessThan":"172fc8b19825a0f5884c38f2289188284e2d45ee","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":"6.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.11","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","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/a38e0714affc5c0bbb40cba5a65d6d32a5e72a71","https://git.kernel.org/stable/c/5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8","https://git.kernel.org/stable/c/f66c16b175509642ee7082df57c9bf3deaebae1a","https://git.kernel.org/stable/c/172fc8b19825a0f5884c38f2289188284e2d45ee"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64290.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64290","state":"PUBLISHED","datePublished":"2026-07-25T08:49:30.049Z","dateUpdated":"2026-08-17T04:52:47.176Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.778Z"},"containers":{"cna":{"title":"iommufd: Break the loop on failure in iommufd_fault_fops_read()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Break the loop on failure in iommufd_fault_fops_read()\n\nOn a copy_to_user() failure inside the inner list_for_each_entry, only the\ninner loop breaks; the outer while re-fetches the just-restored fault group\nand retries the failing copy_to_user() forever, spinning the reader at 100%\nCPU with fault->mutex held.\n\nCheck rc after the inner loop and break the outer while as well."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"07838f7fd529c8a6de44b601d4b7057e6c8d36ed","status":"affected","lessThan":"a38e0714affc5c0bbb40cba5a65d6d32a5e72a71","versionType":"git"},{"version":"07838f7fd529c8a6de44b601d4b7057e6c8d36ed","status":"affected","lessThan":"5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8","versionType":"git"},{"version":"07838f7fd529c8a6de44b601d4b7057e6c8d36ed","status":"affected","lessThan":"f66c16b175509642ee7082df57c9bf3deaebae1a","versionType":"git"},{"version":"07838f7fd529c8a6de44b601d4b7057e6c8d36ed","status":"affected","lessThan":"172fc8b19825a0f5884c38f2289188284e2d45ee","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":"6.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.11","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","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/a38e0714affc5c0bbb40cba5a65d6d32a5e72a71"},{"url":"https://git.kernel.org/stable/c/5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8"},{"url":"https://git.kernel.org/stable/c/f66c16b175509642ee7082df57c9bf3deaebae1a"},{"url":"https://git.kernel.org/stable/c/172fc8b19825a0f5884c38f2289188284e2d45ee"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:52:47.176Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}