{"api_version":"1","generated_at":"2026-07-26T03:22:10+00:00","cve":"CVE-2026-64289","urls":{"html":"https://cve.report/CVE-2026-64289","api":"https://cve.report/api/cve/CVE-2026-64289.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64289","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64289"},"summary":{"title":"iommufd: Set upper bounds on cache invalidation entry_num and entry_len","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Set upper bounds on cache invalidation entry_num and entry_len\n\niommufd_hwpt_invalidate() takes a user-controlled entry_num and entry_len,\neach bounded only by U32_MAX. An entry_len beyond the kernel's struct size\nmakes the copy helper verify the extra bytes are zero, scanning that excess\nin one uninterruptible pass; a multi-gigabyte value over zeroed user memory\ntrips the soft-lockup watchdog.\n\nA large entry_num is the other half, driving the backend invalidation loop\nwith no reschedule. The VT-d nested handler, for one, copies each entry and\nflushes caches per iteration, pinning the CPU on a non-preemptible kernel.\n\nCap both in the ioctl. entry_len is held under PAGE_SIZE, above any request\nstruct, and entry_num under 1 << 19, the order of a hardware invalidation\nqueue and well beyond any real batch, bounding the per-call loop length.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-25 10:17:09","updated_at":"2026-07-25 10:17:09"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/32ca4aed2a66205b072fcfecabe220289a8149ff","name":"https://git.kernel.org/stable/c/32ca4aed2a66205b072fcfecabe220289a8149ff","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d2bd041e0efaf7d81789779b135279d18b33d6d5","name":"https://git.kernel.org/stable/c/d2bd041e0efaf7d81789779b135279d18b33d6d5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2c6381d90898089287e0a358f06f89f6b4b389f2","name":"https://git.kernel.org/stable/c/2c6381d90898089287e0a358f06f89f6b4b389f2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4d70986002f2f3eaaed89124fb2522bded38b016","name":"https://git.kernel.org/stable/c/4d70986002f2f3eaaed89124fb2522bded38b016","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64289","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64289","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8c6eabae3807e048b9f17733af5e20500fbf858c d2bd041e0efaf7d81789779b135279d18b33d6d5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8c6eabae3807e048b9f17733af5e20500fbf858c 32ca4aed2a66205b072fcfecabe220289a8149ff git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8c6eabae3807e048b9f17733af5e20500fbf858c 2c6381d90898089287e0a358f06f89f6b4b389f2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8c6eabae3807e048b9f17733af5e20500fbf858c 4d70986002f2f3eaaed89124fb2522bded38b016 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.8","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.8 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.96 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.39 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.4 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"64289","cve":"CVE-2026-64289","epss":"0.002090000","percentile":"0.111780000","score_date":"2026-07-25","updated_at":"2026-07-26 00:12:33"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/iommu/iommufd/hw_pagetable.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"d2bd041e0efaf7d81789779b135279d18b33d6d5","status":"affected","version":"8c6eabae3807e048b9f17733af5e20500fbf858c","versionType":"git"},{"lessThan":"32ca4aed2a66205b072fcfecabe220289a8149ff","status":"affected","version":"8c6eabae3807e048b9f17733af5e20500fbf858c","versionType":"git"},{"lessThan":"2c6381d90898089287e0a358f06f89f6b4b389f2","status":"affected","version":"8c6eabae3807e048b9f17733af5e20500fbf858c","versionType":"git"},{"lessThan":"4d70986002f2f3eaaed89124fb2522bded38b016","status":"affected","version":"8c6eabae3807e048b9f17733af5e20500fbf858c","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/iommu/iommufd/hw_pagetable.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.8"},{"lessThan":"6.8","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.96","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.39","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.96","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.39","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.4","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"6.8","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Set upper bounds on cache invalidation entry_num and entry_len\n\niommufd_hwpt_invalidate() takes a user-controlled entry_num and entry_len,\neach bounded only by U32_MAX. An entry_len beyond the kernel's struct size\nmakes the copy helper verify the extra bytes are zero, scanning that excess\nin one uninterruptible pass; a multi-gigabyte value over zeroed user memory\ntrips the soft-lockup watchdog.\n\nA large entry_num is the other half, driving the backend invalidation loop\nwith no reschedule. The VT-d nested handler, for one, copies each entry and\nflushes caches per iteration, pinning the CPU on a non-preemptible kernel.\n\nCap both in the ioctl. entry_len is held under PAGE_SIZE, above any request\nstruct, and entry_num under 1 << 19, the order of a hardware invalidation\nqueue and well beyond any real batch, bounding the per-call loop length."}],"providerMetadata":{"dateUpdated":"2026-07-25T08:49:29.434Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/d2bd041e0efaf7d81789779b135279d18b33d6d5"},{"url":"https://git.kernel.org/stable/c/32ca4aed2a66205b072fcfecabe220289a8149ff"},{"url":"https://git.kernel.org/stable/c/2c6381d90898089287e0a358f06f89f6b4b389f2"},{"url":"https://git.kernel.org/stable/c/4d70986002f2f3eaaed89124fb2522bded38b016"}],"title":"iommufd: Set upper bounds on cache invalidation entry_num and entry_len","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64289","datePublished":"2026-07-25T08:49:29.434Z","dateReserved":"2026-07-19T15:36:31.778Z","dateUpdated":"2026-07-25T08:49:29.434Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-25 10:17:09","lastModifiedDate":"2026-07-25 10:17:09","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64289","Ordinal":"1","Title":"iommufd: Set upper bounds on cache invalidation entry_num and en","CVE":"CVE-2026-64289","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64289","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Set upper bounds on cache invalidation entry_num and entry_len\n\niommufd_hwpt_invalidate() takes a user-controlled entry_num and entry_len,\neach bounded only by U32_MAX. An entry_len beyond the kernel's struct size\nmakes the copy helper verify the extra bytes are zero, scanning that excess\nin one uninterruptible pass; a multi-gigabyte value over zeroed user memory\ntrips the soft-lockup watchdog.\n\nA large entry_num is the other half, driving the backend invalidation loop\nwith no reschedule. The VT-d nested handler, for one, copies each entry and\nflushes caches per iteration, pinning the CPU on a non-preemptible kernel.\n\nCap both in the ioctl. entry_len is held under PAGE_SIZE, above any request\nstruct, and entry_num under 1 << 19, the order of a hardware invalidation\nqueue and well beyond any real batch, bounding the per-call loop length.","Type":"Description","Title":"iommufd: Set upper bounds on cache invalidation entry_num and en"}]}}}